bluuebunny/crossref_metadata_2025 huggingface dataset:
Late cenozoic geology, Ancient Pacific Margin NATMAP Project, report 4: paleomagnetic and geomorphic evidence for Brunhes-age volcanism, Fort Selkirk and Rosebud Creek area, Yukon Territory
Authors: Huscroft C A , Barendregt R W , Jackson L E
Published: November 2010

Normally magnetized, valley-filling basalt flows extend more than 10 km down the Yukon River valley from the Fort Selkirk area. These flows are locally overlain by gravel and terminate at the level of the contemporary Yukon River flood plain, suggesting a middle
to late Pleistocene age for this previously unrecognized eruptive event. Unlike other valley-filling phases of the Selkirk Volcanic Group, this eruption postdates the Pliocene to early Pleistocene pre-Reid glaciations. Normal magnetism was also determined for basalt flows underlying terraces in the
area of theRosebud Creek-Grand Valley Creek confluence, 60 km to the northwest of the Fort Selkirk area. Based on their unique geomorphic and stratigraphic settings, the Rosebud basalt flows may represent yet another period of Pleis- tocene volcanism which predates one of the pre-Reid glaciations in
the central Yukon Territory.
Geological setting of Paleozoic strata in the Mount Todd - Adams Lake region, south-central British Columbia
Authors: Acton S L , Paradis S , Thompson R
I , Johnston S T
Published: November 2010

The (?)Paleozoic Sicamous and Tsalkom formations overlie deformed metasedimentary rocks of the Proterozoic and/or Paleozoic Silver Creek Formation in the Adams Lake area. The contact between these units may be transi- tional, an unconformity, or a fault. The
Sicamous Formation can be correlated with unit EBL of the Eagle Bay Assemblage in the Adams Lake-Clearwater region. A sequence of carbonaceous phyllite and slate separates the Silver Creek Formation from the Upper Triassic Nicola Group in the Mount Tod area. These rocks may represent a previously
unrecognized sequence, a Sicamous Formation equivalent, or metamorphosed sedimentary rocks at the base of the Nicola Group.
Discrimination of hot versus cold avalanche deposits: implications for hazards assessment at Mount Meager, British Columbia
Authors: Stewart M L , Russell J K , Hickson C J
Published: November 2010

Avalanche deposits within the Mount Meager volcanic complex are nearly monolithological and comprise mainly intermediate volcanic rock clasts up to 10.5 m, lack internal structure, and are very poorly sorted. Despite these physical similarities, the deposits
originate from two distinct processes, cold rock-avalanche deposits from mass wasting and hot block-and-ash avalanche deposits derived from gravitational collapse of active lava domes and flows. Hot block-and-ash deposits are recognized by the presence of features indicative of high emplacement tem-
peratures. Clasts within rock-avalanche deposits preserve predepositional weathering and jointing surfaces as well as fragmentation surfaces from transport. The ability to discriminate between hot and cold avalanche deposits and the recognition of multiple volcanic events are critical to hazard
assessment in volcanic terranes. Misidentifica- tion can lead to underestimating the risk of one (i.e. volcanic) hazard whilst overestimating the other (i.e. mass wasting).
Ground-magnetic investigations of Cenozoic structures in the northern Cascadia forearc, British Columbia
Authors: Lowe C , Baker J , Journeay J M
Published: November 2010

Accurate delineation of active structures is a critical component in improved seismic hazard models of the northern Cascadia forearc. To date, young faults in this region have been mapped directly through geological methods and indirectly though expensive seismic
methods. We report findings of pilot ground magnetic surveys conducted across five Cenozoic structures in the forearc. The survey objective was to determine if high-resolution aeromagnetics could provide a faster and less expensive method of delineating the structures than currently exists. Results
show recent deformation resulted in depletion of magnetic minerals from most fault zones. However, as the undeformed sedimentary rocks surveyed are only weakly magnetic, the magnetization contrast created by this loss was, in most cases, insufficient to generate a clear magnetic anomaly. However,
moderately to highly mag- netic crystalline rocks underlie much of the frontal arc and western forearc. If similarly deformed, structures cutting these rocks have the potential to generate large magnetic anomalies.
Drift-prospecting investigations in the Yellowknife Greenstone Belt, Northwest Territories
Authors: Kerr D E , Knight R D , Smith D , Nickerson D
Published: November 2010

Surficial geology studies and geochemical analyses of till and organic materials provide new baseline data for min- eral exploration in the Yellowknife Greenstone Belt. The mapped pattern of ice-flow indicators throughout the study area is generally consistent
with the dominant regional flow and confirms a generally southwestward ice move- ment. Minor variations indicate local late-glacial flow ranging from west-northwestward to west-southwestward. Pebble-lithology studies indicate that dispersal patterns in till reflect the last southwestward flow.
Metasedimentary and volcanic (nongranitic) clasts predominate in most areas underlain by both metasedimentary-volcanic and gra- nitic bedrock, and suggest transport distances of at least 25 km for some clasts. Gold-grain counts of the heavy-mineral fraction of till indicate that background values
over granitic terrain for each sample is approximately 0 to 1 grain/10 kg of till. Anomalous concentrations of 19 gold grains/sample in granitic terrain southeast of Drybones Bay are currently being investigated.
Porosity characteristics of mineralized and nonmineralized rocks from the Yellowknife mining district, Northwest Territories
Authors: Scromeda-Perez N , Connell S
Published: November 2010

Effective porosity measurements were performed on a suite of 17 samples from the Yellowknife mining district, Northwest Territories. The samples include massive flow, mafic volcanic flow, metagabbro, and talc-chlorite schist. The purpose of this study is to
provide basic data to be used in the determination of petrophysical characteristics and electrical conductivity mechanisms of these rocks. The porosity data, when accompanied by other petrophysical measurements, can be used in the development of exploration strategies for aiding interpretation of
downhole, ground, and electromagnetic surveys. This paper documents the results and describes the methods and processes used to obtain these porosity data. Results indicate that bulk density (_ B ) and effective porosity ( E ) values are in the ranges of 2.70 to 3.05 g/mL and 0.19 to 2.77%,
respectively, for these samples. Massive flow, mafic volcanic flow, talc-chlorite schist, and metagabbro samples have porosity ranges of 0.19 to 0.39%, 0.27 to 2.60%, 0.45 to 0.75%, and 0.67 to 2.77% respectively.
New multidisciplinary geological investigations in the Walmsley Lake area, southeastern Slave Province, Northwest Territories
Authors: MacLachlan K , Relf C , Cairns S , Hardy F , Davis B
Published: November 2010

C4 Geological mapping in the Walmsley Lake area, southeastern Slave Province,has defined relationships between metamorphism, deformation, andplutonism that suggest plutons similar to the Defeat suite in the Yellowknife domain were emplaced before or early during
peak metamorphism and defor- mation (D 2 ). Younger two-mica granite units similar to the Prosperous suite in the Yellowknife domain are, at least in part, post-D 2 . Fabric S 2 is the predomi- nant fabric throughout the area, but the map pattern it defines is controlled pri- marily by northeast-
and northwest-trending, upright, F 3 folds. Ice-flow studies identified three sets of striations, the early and late ones reflect ice-flow influenced by topography.
Volcano-sedimentary correlation and fault relationships in the Baker Lake Sub-basin, Thrity Mile Lake area, Nunavut
Authors: Hadlari T , Rainbird R H
Published: November 2010

The volcanic succession of the Baker Lake Group in the Thirty Mile Lake area in ascending order is 1) felsic minette flows, 2) mafic minette flows, and 3) felsite flows. The succession is time-equivalent to the third-order sequences BL-2, BL-3, and BL-4 of the
ca. 1.83 Ga Baker Lake second-order sequence (Baker Lake Group). Two sets of faults are recognized throughout the Baker Lake Sub-basin: an east-trending set of normal faults that have accommo- dated north-south extension and a conjugate set of strike-slip faults trending about 340° and
040° that have accom- modated east-west extension and north-south shortening. The strike-slip faults offset and therefore postdate the normal faults. Faulting was contemporaneous with deposition of the Wharton Group (1765-1750 Ma) but ceased before deposition of the Barrensland Group (1720 Ma).
Bedrock mapping in the Committee Bay Belt, Laughland Lake area, central mainland, Nunavut
Authors: Sandeman H A , Brown J , Studnicki-Gizbert C , MacHattie T , Hyde D , Johnstone S , Greiner E , Plaza D
Published: November 2010

The Committee Bay Belt is underlain by northeast-trending rocks of the Archean Prince Albert Group, flanked to the north and west by paragneiss and associated peraluminous and metaluminous granitoid bodies, and to the south and east by metaluminous granitoid
bodies. The Prince Albert Group comprises dominant semipelite and psammite, iron-formation and quartzite, with less abundant, spinifex-textured komatiite, and rare basaltic and intermediate to felsic volcanic rocks. Synvolcanic intrusions ranging from rare gabbro, quartz diorite and diorite, to
abundant tonalite, granodiorite and granite, outcrop south, east, and northwest of a plutonic body of tonalite to granodiorite interpreted to be younger than the supracrustal belts. To the west and north, metamorphic grade increases to amphibolite facies with consequent development of paragneiss and
accompanying peraluminous melts. To the southeast, a granitic intrusive suite is cut by an anorthosite complex, both of which are intruded by Paleoproterozoic monzogranite.
Preliminary report on the stratigraphy and structure of the Bee Lake greenstone belt, Superior Province, northwestern Ontario
Authors: Rogers N
Published: November 2010

The Bee Lake greenstone belt consists of a relatively simple volcano-sedimentary stratigraphic sequence that has undergone two folding events and subsequent brittle-ductile faulting. These rocks have been intruded by several generations of dykes and plutons that,
once dated, will allow the timing of deformation to be constrained. The supracrustal sequence consists of basal massive basaltic flows, pillow basalt, and pillow breccia, which are overlain by felsic volcaniclastic and epiclastic tuff and breccia that are locally interbedded with arkosic or
quartzose wacke and conglomerate. Locally the conglomerate contains boulder-sized clasts of granodiorite that has under- gone little to no pre-entrainment deformation. Previously the Bee Lake greenstone belt has been correlated with the Confederation assemblage. However, the noticeably different
rock types and stratigraphy between this region and the type section for the Confederation assemblage suggest that this correlation is invalid.
Three hundred million years of tectonic history recorded by the Red Lake greenstone belt, Ontario
Authors: Sanborn-Barrie M , Skulski T , Parker J
Published: November 2010

The Red Lake belt records ca. 300 Ma of episodic magmatism, sedimentation, and tectonothermal activity along the south margin of the 3 Ga North Caribou terrane. Autochthonous assemblages appear to reflect initial (2.99-2.96 Ga) plume magmatism, 2.94 to 2.91 Ga
arc magmatism, 2.90 to 2.89 Ga sedimentation, and protracted Neoarchean continental arc and intra-arc rift-related magmatism (2.75-2.73 Ga). A ca. 2.85 Ga oceanic assem- blage containing MORB-like basalt may have been accreted and caused early uplift and erosion prior to Neoarchean magmatism. This
was followed by collisional orogenesis at ca. 2.72 Ga, the Uchian phase of the Kenoran Orogeny, which was accompanied by extensive hydrothermal alteration and gold mineralization.
New data on Archean alkalic intrusions in northwestern Ontario and northern Minnesota
Authors: Lassen B , Hattori K H , Percival J A
Published: November 2010

Field observations and major- and trace-element geochemical data are presented for Neoarchean alkalic intrusions of the Quetico metasedimentary belt in northwestern Ontario and northern Minnesota. The intrusions are characterized by high total alkalis (Na 2 O +K
2 O) (up to 13 weight per cent) for a given SiO 2 content and show enrichment in large-ion lithophile elements and light rare-earth elements, and varied depletion in high field-strength elements. They include silica-undersaturated units. The differentiation history of the intrusions involves
fraction- ation of clinopyroxene, hornblende, feldspar, Fe-Ti oxides, apatite, and titanite. The Blalock intrusion can also be classified as part of the sanukitoid suite. Other intrusions in the study are more evolved, with distinct alkalic affinities.
Late Holocene pollen stratigraphy of Lake Louise, Manitoba
Authors: Brooks G R , Grenier A
Published: November 2010

The late Holocene pollen stratigraphy of Lake Louise, Manitoba, consists of two zones, zone 1 from 35 cm to 64.5 cm deep, and zone 2 extending from 0 to 30 cm deep; the transition from zone 1 to zone 2 occurs between sampling points at depths of 30 cm and 35 cm.
Zone 1 predates the establishment of European agricultural prac- tices and is interpreted to resemble an open oak savannah community, but with the oak present marginal to the lake and nearby Red River channel rather than being dispersed as an open forest. Within zone 2, the rise at 30 cm ofAmbrosia
, Liguliflorae, Cruciferae, and cereal species of Gramineae is interpreted to represent large-scale land disturbance caused by the introduction of European agricultural practices during the late 1870s and early 1880s. Chronological data suggest an increase of about ten times in the sedimentation
rate in Lake Louise within zone 2 relative to zone 1.
Preliminary observations on the Cenozoic outliers of northeastern Ellesmere Island, Nunavut: sedimentology and stratigraphy of the syntectonic conglomerate units
Authors: Lee C
Published: November 2010

Statistical and paleocurrent evidence provides insight into the origin of three (?) Late Paleocene conglomerate units of the Eurekan Orogen on Ellesmere Island. Point-count data display three distinct compositional trends within each area and reveal that the Cape
Lawrence and Cape Back conglomerate units were likely derived from carbonate and siliciclastic rocks of Ordovician and Cambrian age, respectively. An abundance of siliciclastic rocks in the upper half of these successions suggests a normal unroofing scenario, as younger Ordovician carbonate clasts
prevail below. A similar sequence (in addition to Silurian carbonate clasts) is observed at Franklin Pierce Bay, where paleocurrent directions show an east and southeast transport direction. In contrast, north to northeast directions dominate at Cape Lawrence whereas northeast, southwest, and
northwest directions dominate at Cape Back. These paleocurrent variations correspond to changes in rock types.
Stratigraphy of the Cass Fjord Formation (Middle and Upper Cambrian), northeast Ellesmere Island, Nunavut
Authors: Dewing K , Harrison J C , Mayr U
Published: November 2010

The Middle and Upper Cambrian strata on northeast Ellesmere Island are placed in a single unit, the Cass Fjord Formation, with Lower, Middle, and Upper members. The boundary between the Lower and Middle members of the Cass Fjord Formation is chosen at the base of
a variegated unit that is readily traced in the field and on airphotos. The boundary between the Middle and Upper members of the Cass Fjord Formation is chosen at a major uncon- formity that is difficult to recognize in the field and on airphotos. The Lower and Middle members comprises a major
unconformity-bounded sequence containing four shallowing-upward cycles that correlate with the deeper water Hazen Formation unit C. The Upper Member comprises a major unconformity-bounded sequence containing two shallowing-upward cycles and correlates with Hazen Formation unit D.
Étude préliminaire des formations quaternaires comblant les vallées des basses Laurentides, nord-ouest de Montréal, Québec
Authors: Ross M , Parent M , Bolduc A M , Hunter J , Benjumea B
Published: November 2010

This report presents some preliminary results from the 1999 and 2000 field work conducted to investigate the strati- graphic architecture and sedimentological characteristics of surficial sediments in an area northwest of Montréal. Four targeted boreholes
and a land-based, shallow, high-resolution seismic profile are described and interpreted. These data will be used to produce a geological model for defining the movement of groundwater and evaluating the vulnerability of regional aquifers to contamination. Preliminary results reveal a complex
late-glacial topography suggesting the existence of a former channelized subglacial drainage system. Furthermore, some of these valleys contain subaqueous outwash deposits of possible glaciolacustrine origin. These deposits are excellent confined aquifers that must be fully integrated in regional
groundwater models.
Application of high-resolution seismic-reflection techniques in Champlain Sea sediments near Lachute - Saint-Benoît, Quebec
Authors: Benjumea B , Hunter J A , Good R L , Burns R
A , Ross M
Published: November 2010

High-resolution seismic-reflection techniques have been tested and applied at several sites northwest of Montréal where thick Quaternary deposits were suspected. This work was conducted as an aid in determining the three-dimensional structure of the Holocene
and Pleistocene stratigraphy in the area for ongoing NATMAP and groundwater studies. Initial test seismic arrays indicated areas with substantial thicknesses of overburden above bedrock, several reflecting horizons interpreted as distinct lithological contacts, and high-frequency reflection sig-
nals providing good vertical resolution. From the initial testing results, specific survey lines were selected, and common mid-point reflection techniques were designed to optimize the rate and quality of data acquisition. A modi- fied form of 'centre-spread' shooting was adopted, that not only
provided adequate stacking (12 fold), but also allowed improved estimates of subsurface velocities required for seismic processing. An example of processed seismic section shows excellent stratigraphic detail.
The unconformable character and paleogeographic significance of the Chazy-Black River group contact, Montréal area, southwestern Quebec
Authors: Salad Hersi O , Lavoie D
Published: November 2010

An unconformity marks the Chazy-Black River group contact in southwestern Quebec. It is characterized by an eastward pinching out of the Pamelia Formation (Black River Group), borings, and truncation of the Chazy strata. Coarse-grained sandstone of the Pamelia
Formation or Lowville Formation (where the former is missing) lies above the contact. Lithological differences between dolostone units in the Laval (Chazy Group) and Pamelia for- mations were recognized, allowing us to better position the contact. The Pamelia Formation (44 mthick) in eastern Ontario
conformably overlies the Chazyan strata. From Montréal to Québec progressively younger Black River strata onlap older rocks. This onlapping is accompanied by substantial lithological changes where sandstone and different limestone lithofacies are preserved. These variations suggest a more
limited accommodation space for the Black River strata in southwestern Quebec, and, therefore uplifting relative to eastern Ontario. This uplifting is probably due to old structural lineaments reactivation by the then ongoing Taconian Orogeny, and may indicate an incipient upthrow of the Beauharnois
anticline.
Contributions to the sedimentology of the Strites Pond Formation Cambro-Ordovician Phillipsburg Group, southwestern Quebec
Authors: Salad Hersi O , Lavoie D
Published: November 2010

The Cambro-Ordovician Strites Pond Formation of the Philipsburg Group overlies the Rock River Formation with an apparent tectonic contact and is disconformably overlain by the Wallace Creek Formation. The Strites Pond Formation consists of a lower dolostone
member characterized by bioclastic, oolitic dolopackstone to grainstone and perva- sively coarse-crystalline dolostone, and an upper limestone member of thickly bedded mudstone and thrombolitic bioherm interbeds. Subordinate carbonate-rich sandstone and shale layers occur in both members.
Microbially laminated dolostone also occurs within the uppermost part of the formation. Sedimentological attributes of the Strites Pond Formation suggest a subtidal to intertidal ooid and bioclast shoals to a subtidal environment domi- nated by mound-building microbial organisms. High-order
sea-level fluctuations and vicinity of terrestrial siliciclastic supply area are manifested by numerous coarse-grained sandstone interbeds throughout the forma- tion. The overlying Wallace Creek Formation accumulated in a deeper marine setting suggesting a sea-level rise after deposition of the
Strites Pond Formation.
New depositional environment for the Ile d'Orléans Group, Quebec Appalachians
Authors: Longuépée H , Cousineau P A
Published: November 2010

Detailed logging of the sedimentary structure of the Cambro-Ordovician Île d'Orléans Group near Québec have permitted us to proposed a new interpre- tation of depositional setting of these sedimentary rocks. It is proposed that the Anse Maranda
Formation, with its highly bioturbated mudstone and sandstone was probably deposited at the outer part of a continental shelf. The Lauzon Formation exhibits sedimentary facies like those of a fine-grained turbidite fan. The Pointe-de-la-Martinière Formation shows facies that most likely
represent the upper continental slope with contourite and/or tempestite beds.
A diagenetic study of dolostone of the Lower Ordovician Romaine Formation, Anticosti Island, Quebec
Authors: Chi G , Lavoie D
Published: November 2010

This study deals with the diagenetic evolution of dolostone of the Romaine Formation, Anticosti Island. Four types of calcite and six types of dolomite were distinguished. According to fluid-inclusion and C-O isotope data, sedimen- tary micrite, replacement
calcite, and early pore-filling calcite were formed in sedimentary and early diagenetic environments. Early replacement dolomite phases were formed in an early burial environment. Later replacement dolomite and pore-filling dolomite as well as minor sphalerite were formed from warm, saline fluids
interpreted to be of hydrothermal origin. Significant porosities were produced through dissolution of early replacement dolomite phases by these fluids. Intercrystal porosities were created in later replacement dolomite phases. The dissolution porosities were partly occluded by late-stage calcite,
pyrite, and barite. Hydrocarbon inclusions were recorded in late-stage calcite and contemporaneous barite, indicating a hydrocarbon migration event after the porosity-generating processes.
Aeromagnetic Survey Program of the Geological Survey of Canada, 2000-2001
Authors: Dumont R , Kiss F , Coyle M , Oneschuk D , Dostaler F , Tod J
Published: November 2010

In 2000, the Geological Survey of Canada supervised four aeromagnetic survey contracts totaling 260 385 line kilometres. These surveys were flown in the Northwest Territories, Nunavut, British Columbia, and Quebec. In addition, private-sector airborne geophysical
survey data sets were recompiled for areas in northern Ontario and Newfoundland.
Clay mineralogical study of indurated seafloor sediment samples from the Lihir area, Papua New Guinea
Authors: Obina B , Percival J B , Hunt P
A
Published: November 2010

Detailed studies of samples collected from two seafloor cruises to the Lihir area in Papua New Guinea continue. In 1994, a detailed study of the Tabar-Lihir-Tanga-Feni island chain in the New Ireland fore-arc basin was con- ducted aboard the R/V Sonne (cruise
SO-94). The discovery of four new seamounts led to further investigations in 1998 (cruise SO-133). Edison Seamount was determined to be hydrothermally active and marked a new type of setting on the seafloor for shallow-marine hot springs. Conical Seamount, a dormant cone, is characterized by dis-
tinctive epithermal-style gold mineralization. Two unusual indurated sediment samples from Conical Seamount were the focus of this study. They are com- posed of amorphous silica/glass and/or iron oxide layers (crusts), iron-bearing smectite and calcite. These miner- als occur in a low-temperature
hydrothermal environment, indicating that these samples are the end product of submarine hydrothermal alteration and sea-water/rock interactions.
New interpretive tools for three-dimensional structural geological modelling: Bézier-based curves, ribbons, and skeletons
Authors: de Kemp E A , Sprague K B
Published: November 2010

Interpreting the geometry of geological objects is a standard activity of field-based geologists. We present new graphics tools that will aid in extending standard methodologies for two-dimensional (2D) geological mapping into a three-dimensional (3D)
environment. Much of the existing 3D geological modelling software supports the construction of objects with the input of dense control data. However, for regional mapping and mining exploration work, sparse data is the norm. Tools are required, therefore, that give the expert interpreter full
control of the graphics objects, while at the same time being constrained to specific control data from field observations. We present the initial results of a software design and programming project for the visualization of complex regional-scale geological objects using Bézier-based graphics.
In addition, we introduce the concept of a structural ribbon, which is an extended map trace, along with methods for the optimization of surface construction using graphical skeletons.
A Palm-based digital field-data capture system
Authors: Gilbert C , Parlee K , Scott D J
Published: November 2010

To expedite delivery of the digital geological products of new fieldwork, digital capture of point observations must occur on the outcrop in order to expedite the population of a database while the mappers are still in the field area. A variety of currently
available handheld devices and software has been evaluated for this purpose, and a robust, effi- cient digital data-collection process has been developed. Using Pendragon Forms(tm) 3.0 data-collection software, we have created an electronic data-collection 'form' for the Palm(tm) model IIIe handheld
device. The mapper com- pletes a data form at each outcrop; upon completion of the traverse, the data are downloaded to a database in camp for immediate visualization using a GIS. Data verification and preliminary interpretation can occur in the field, and production of products for publication can
begin immediately.
BsnMod: A Windows program for simulating basin-scale fluid flow and heat transfer processes related to sediment compaction and tectonic uplifting in two dimensions.
Authors: Chi G
Published: November 2010

Sediment compaction and tectonic uplift are common driving forces for basinal fluid flow. Fluid-flow and heat-transfer processes are described by medium-continuity, fluid-continuity, and heat-conservation equations. Numerical solution of these equations simulates
the evolution of porosity, permeability, fluid overpressure, flow rate, and temperature. A finite difference method, using an approximate curvilinear co-ordinate system, was described and used by previous workers with a modified numerical scheme. The same numerical scheme is used in BsnMod, but
Visual C++TM is used instead of FORTRAN as the programming language. The program has a user interface allowing input on model selection (compaction, gravity), basin and grid configuration, medium properties, and boundary conditions. The output can be both graphics and spreadsheets. The graphic
output consists of the grid, fluid-flow vectors, isotherms, and isobars, and can be copied to and edited by other graphic programs.
Tremblements de terre: Charlevoix-Kamouraska, Québec
Authors: Lamontagne M
Published: November 2010

L'affiche sur la séismicité de Charlevoix-Kamouraska et son matériel d'accompagnement visent à susciter l'intérêt du lecteur envers les tremblements de terre et la préparation individuelle pour faire face aux situations
d'urgence. L'information contenue dans cette affiche n'est pas exhaustive: elle se veut accrocheuse afin, idéalement, d'amener des actions concrètes de la part du lecteur. Dans l'affiche, le lecteur se familiarise d'abord avec les évidences de séismes majeurs (magnitude 6,0 et
plus) probables dans cette région. Une carte montrant l'activité séismique de l'est du Canada est montrée. Une autre carte montre la position des quelque 2 000 tremblements de terre (cercles) enregistrés entre 1978 et 1999, sur un fond de carte issue d'un montage d'une image
de RADARSAT (texture) et d'un modèle numérique de terrain (couleurs). Avec l'aide de lunette spéciales incluses, cette carte donne une image en trois dimensions de la séismicité et des traits physiographiques de la région. Finalement, plusieurs photos de dommages dus
au tremblement de terre de 1925 sont montrées. Le texte donne des réponses succinctes sur la problématique des séismes de cette région. La prise de conscience de l'activité séismique de la région devrait susciter l'intérêt pour une meilleure
préparation individuelle. Le lecteur est amené à visiter quelques sites internet où des renseignements supplémentaires sont disponibles. Du matériel complémentaire est inclus dans cette trousse d'accompagnement.
GIS dataset: preliminary geology of Mount Martin (95C/1), Yukon Territory, British Columbia, and Northwest Territories.
Authors: Fallas K M
Published: November 2010

The geological information is derived from regional mapping in the Mount Martin (NTS 95C/1) map area, as part of the Geological Survey of Canada's Central Foreland NATMAP program.
Geological features represented by attributed points, lines, and polygons have been compiled into a GIS project suitable for stand-alone use, or integration with other data sets. User-defined attributes provide traditional geological map information with greater detail and enhancements such as
explicit orientation data, lithologies, traverse lines, and notable features. The geology of this foothills area is characterised by sedimentary strata, of Late Devonian to Late Cretaceous age, exposed in a series of box folds whose geometry is controlled largely by the competence of the
Carboniferous Mattson Formation. Permian strata formerly included in the Upper member of the Mattson Formation have been mapped separately as the Tika map unit. Upper Paleozoic and Triassic strata are unconformably overlain by Lower Cretaceous rocks of the Chinkeh Formation and younger units.
Sub-Cretaceous erosion is a major control on the distribution of these units within the map area. The sinuous appearance in map view of major structures is largely due to en echelon linkages of smaller culminations. Nearly vertical bedding dips on the flanks of several structures may have led
previous mappers to interpret thrust faults in some of these areas. In at least some cases, these interpreted faults are not required by the distribution of the map units. Purpose: Provided as part of a National Mapping (NATMAP) committment to compile Geographic Information System products.
Supplemental_Information: Points, lines, polygons, and attribute data representing the geology of the area covered by NTS maps 95C/1 (1:50 000 scale) in southeastern Yukon Territory, southwestern Northwest Territories, northwestern British Columbia, Canada
A new istopic and trace-element standard for the ion microprobe: preliminary thermal ionization mass spectrometry (TIMS) U-PB and electron-microprobe data; Radiogenic age and isotopic studies: Report 14
Authors: Stern R A
Published: November 2010

Fragments of a gem zircon megacryst (BR266) were examined using thermal ionization mass spectrometry (TIMS) and electron-microprobe analysis to determine absolute age and elemental composition. The mean 206 Pb/238 U and 207 Pb/206 Pb ages were 559.0 ± 0.3 Ma
and 562.2± 0.5 Ma, respectively. The mean U, Th, and Hf concentrations were 909 ppm, 201 ppm, and 8220 ppm, respectively, with standard errors of 1-3%. Ion-microprobe isotopic analysis shows that the U-Pb isotopic system at the 10-30m m scale is homogeneous at about the 1% level. This
zircon has been adopted as the principal isotopic and geochemical reference material for zircon studies at the GSC Sensitive High Resolution Ion Microprobe (SHRIMP) laboratory.
An analytical procedure for determining spectral induced polarization characteristics of anisotropic rocks, Yellowknife mining district, Northwest Territories
Authors: Katsube T J
Published: November 2010

Electro-electrochemical models for mineralized rocks previously proposed are generally too simplistic for application to rock textures containing sulphide minerals in anisotropic rocks. A new spectral induced polarization study (1 10 6 Hz) has been carried out to
modify and enable application of these models to a typical anisotropic rock with layers enriched in electronically conductive sulphide minerals and layers barren of such minerals. This includes the use of scanning electron microscope images of rocks. Results indicate the existence of dielectric
effects of rock-forming minerals, frequency-dependent permittivity and resistivity effects of pore surfaces in layers barren of sulphides, and nonfrequency-dependent resistivity effects in both the mineralized and nonmineralized layers. Frequency-dependent permittivity effects of
electrochemicaldouble layers on sulphide grains in the mineralized layers also existed. These effects have been characterized by nine coefficients of an equivalent circuit to model the rock. These coefficients were determined by interactive curve fitting of calculated to measured
curves.
Reconnaissance gamma-ray spectrometry studies of the Paleoproterozoic Piling Group and adjacent Archean basement rocks, central Baffin Island, Nunavut
Authors: Ford K L
Published: November 2010

In the southern Melville Peninsula, strong radioactive element patterns, measured by reconnaissance airborne gamma-ray spectrometry, clearly discriminate Archean orthogneiss and various Archean and Proterozoic plutonic rocks. Similar geological units occur in the
central Baffin Island region. In 2000, a brief field study was conducted in central Baffin Island to determine if radioactive element (K, eU, and eTh) variations measured by ground gamma-ray spectrometry can be used to assist ongoing geological mapping activities. Although radioactive element
concentrations are generally low in the supracrustal rocks of the Piling Group, variation in K and eTh concentrations are associated with lithological variations. Basement rocks, composed of Archean orthogneiss and various Archean and Proterozoic granitic intrusions, produce strong radioactive
element contrasts. Young pegmatite plutons can be distinguished from older intrusions by low eTh concentrations and high eU/eTh ratios. Various Archean and Proterozoic intrusions also have characteristic radioactive element signatures which distinguish them from Archean orthogneiss.
Near-surface seismic methods applied to site-response charcterization at an earthquake monitoring station near London, Ontario
Authors: Benjumea B , Pullan S E , Hunter J A , Burns R
A , Douma M , Eaton D
Published: November 2010

Near-surface seismic methods have been applied in an area south of London, Ontario, in order to image subsurface structure of the overburden and bedrock surface and to obtain estimates of elastic parameters of these sediments. This work was conducted as a pilot
study to determine the seismic site response at a future seismograph site for earthquake monitoring. Two seismic refraction-reflection profiles were acquired on two different terraces cut by the Thames River. The results show two major acoustic impedance boundaries, one within overburden related to
the presence of a buried overconsolidated till and the other at the overburden-bedrock contact. The elevation of these two contacts is the same for both studied terraces. A 1-D model has been used to obtain estimates of the variation of fundamental site periods in the survey area. The results of
this survey provide the basic information needed to evaluate the site response effects.
Mineralogical investigations of Canadian till and lake- and stream-sediment reference materials: part 1. Standardized X-ray diffraction and scanning electron microscope methods
Authors: Percival J B , Hunt P , Wygergangs M
Published: November 2010

Reference materials are used in geochemical studies as quality control in chemical analyses, and in mineralogical analyses for identification of unknowns and modal proportions. In this Metals in the Environment (MITE) project, the mineralogy of twelve geochemical
reference materials were evaluated through X-ray diffraction and scanning electron microscope analyses. The reference materials are derived from soil, till, and lake and stream sediments, and mineralogical analyses are based on the bulk sample and the clay-sized fraction. The effect of a
pretreatment to remove X-ray amorphous organic matter from the clay-sized fraction prior to semiquantitative X-ray diffraction analyses was examined, and ways to assess the amount of this material in a sample were summarized through a literature review. In addition, the resolution of scanning
electron microscope images of clay-sized materials using carbon and gold coatings were compared. A standardized procedure for mineralogical characterization of soil, till, and sediment materials is presented.
Red Indian Line, airborne geophysics compilation (part I), central Newfoundland
Authors: Oneschuk D , Tod J , Kilfoil G
Published: November 2010

Natural Resources Canada funded the recompilation of airborne magnetic and electromagnetic geophysical data over the Red Indian Line area of central Newfoundland as part of the national Targeted Geoscience Initiative (TGI) to stimulate mineral exploration. The
Government of Newfoundland and Labrador (GNL) supplied detailed survey data from their assessment files and the Geological Survey of Canada (GSC) contributed regional data plus their expertise for processing and compiling the data. The objective of this geophysical recompilation is to make available
to the public previously unpublished private sector data from GNL and to present it in the context of the regional magnetic coverage. These private sector surveys were submitted to GNL to meet mining claim assessment requirements. Each magnetic data set has been re-processed and merged with the GSC
regional coverage, whereas the electromagnetic (EM), magnetic vertical gradient and VLF-EM data have simply been copied from the original files. Six more blocks of data will be available to the general public as part II of this project in the spring of 2002. These new data will be released as a
separate CD.
Isostatic residual gravity anomaly map, Canada
Authors: Miles W F , Roest W R , Vo M P
Published: November 2010

The isostatic residual gravity anomaly map of Canada shows variations in the gravity field caused by lateral variations ln the density of the Earth's crust and upper mantle that reflect variations in composition and thickness. Systematic gravity mapping began in
Canada in 1944 and is ongoing. All data are tied to the International Gravity Standardization Network 1971. Local gravity anomalies result from the juxtaposition of relatively high- and low-density rock types. Shorter wavelength anomalies, representing nearer surface density contrasts, are enhanced
by removing the calculated affects of the isostatic roots that support topographic loads.
A digital database of permafrost thickness in Canada
Authors: Smith S L , Burgess M M
Published: November 2010

A permafrost thickness database for northern Canada is presented. This national database includes publicly available information from published and unpublished sources for 1005 sites; 916 of these are terrestrial sites and 89 are marine sites. Much of the data
were collected between 1960 and mid 1980s. The depth of the 0°C isotherm and the base of ice-bearing permafrost is recorded in the database. Also included is information on site characteristics such as air temperature, geology and vegetation, which influence the thickness of permafrost at a
particular site. The reference for the site is also included and may be consulted for further information. The database is presented digitally as an Excel spreadsheet. A series of maps and graphs illustrate site distribution, permafrost thickness and other attributes of the
database.
Structural geology of the northern Liard Range, Franklin Mountains, Northwest Territories
Authors: Hynes G F , Dixon J M , Lane L
S
Published: November 2010

The northern Liard Range is a complex, faulted anticline cored by resistant Early Carboniferous clastic and carbonate rocks, and flanked on both sides by Early Cretaceous clastic rocks. In the study area, the Liard Range defines an eastward-opening arc, striking
north-northwest in the south, but swinging toward the northeast, in the north. In the south, the Carboniferous Prophet Formation is thrust over Carboniferous sandstone of the upper Mattson Formation. This east-directed thrust appears to terminate in the apex of the arc. North of the arc, the
structure is defined by the southwest-plunging Mattson anticline. In the vicinity of the arc, box folds are common on the east side of the range. The box folds have shallowly east-dipping crestal surfaces and steeply dipping limbs. The folds vary in complexity from ridge to ridge with some folds
being harmonic while others display various types of disharmony.
Geochemistry of basalt from the Wolverine volcanic-hosted massive-sulphide deposit, Finlayson Lake district, Yukon Territory
Authors: Piercey S J , Paradis S , Peter J
M , Tucker T L
Published: November 2010

Massive basaltic flows stratigraphically overlie aphyric felsic rocks in the hanging wall of the Wolverine volcanic-hosted massive-sulphide deposit. The geochemical signatures of these flows are simi-lar to those of normal and enriched mid-ocean-ridge basalt;
however, some have elevated Th contents simi-lar to back-arc-basin basalt. These features suggest that Wolverine basalt was derived from depleted to weakly enriched mantle sources with minor subduction-zone metasomatic input and/or a crustal component via crustal contamination. The presence of such
rocks in close primary association and juxtaposition with crustally derived felsic volcanic rocks, together with their bulk compositions, indicate that the Wolverine deposit formed within an ensialic back-arc rift to nascent back-arc-basin setting. The flat heavy rare-earth-element signatures on
chondrite-normalized plots require that the Wolverine basalt formed from low-pressure mantle melting (spinel stability field) with a minimal lithospheric cap.
Structural geology of the eastern Bella Coola map area, southwest British Columbia
Authors: Mahoney J B , Struik L C , Diakow L J , Hrudey M G , Woodsworth G J
Published: November 2010

Rocks of the eastern Bella Coola (NTS 93 D) map area record several distinct deformational events representing episodic extension, contraction, and transpression in the region. Extension may have been coeval with the generation of volcanic sequences of the
Jurassic Hazelton Group and Lower Cretaceous Monarch sequence. Lower Cretaceous Monarch sequence rocks exhibit tight, northeast-vergent folds and minor thrust faults. This contractional belt is cut by ductile protomylonitic to mylonitic transpressional shear zones (10-1000 m wide) that affect most
rocks in the western portion of the mapped area, and are themselves cut by various granite and tonalite bodies. Brittle faults cut all rocks of the area and form prominent, north-south-trending topographic linear features.
Reconnaissance of structural geology of the Atnarko metamorphic complex, southern Tweedsmuir Park, British Columbia
Authors: Israel S A , Kennedy L A
Published: November 2010

The Atnarko metamorphic complex consists of polydeformed, Jurassic to Tertiary, intermediate plutonic and volcanic rocks. Northwest-striking fabrics dominate the southern portion of the complex, whereas northeast-striking fabrics dominate the northern portion of
the complex. The central portion con-tains fabrics of both orientations. Large northwest- and north-striking, dextral, mylonite zones crosscut the main gneissic fabric, as do smaller sinistral and dextral, east-striking, ductile shear zones. At least three phases of folding are documented; F 1 and F
2 folds are tight to isoclinal with coplanar fold axes, and F 3 folds are open to closed with east- to southeast-plunging fold axes. Brittle deformation, expressed as large, north-striking, steeply dipping shear zones and discrete, randomly orientated fractures crosscut all other structures. Ages of
deformation and the regional significance of these structures are not yet known and are the subject of ongoing research.
Glaciovolcanism at Ember Ridge, Mount Cayley volcanic field, southwestern British Columbia
Authors: Kelman M C , Russell J K , Hickson C J
Published: November 2010

Quaternary volcanic rocks at Ember Ridge were mapped at 1:20 000 scale as part of a larger investigation of glaciovolcanism within the Mount Cayley volcanic field in southwestern British Columbia. These deposits consist of at least six isolated, steep-sided
andesite mounds, whose morphology and complex fine-scale jointing indicate lava quenching beneath ice. The scarcity of volcaniclastic material at the Ember Ridge deposits suggests the suppression of explosive fragmentation during eruption. If these deposits are coeval, then the elevation range
covered by the glaciovolcanic rocks indicates a minimum ice thickness of at least 670 m.
Improved relative sea-level histories for Victoria and Vancouver, British Columbia, from isolation-basin coring
Authors: James T S , Hutchinson I , Clague J J
Published: November 2010

Freshwater sediments in low-elevation lakes and bogs in southwestern British Columbia are commonly underlain by marine and glaciomarine deposits. Radiocarbon ages from the marine-freshwater transition define the time that basins became isolated from the sea. Data
from five lakes and bogs in the Victoria area, combined with earlier results, indicate that sea level fell from above 60 m a.s.l. to below present sea level between 12 500 and 11 500 14 C years ago. In the Fraser Lowland, data from seven lakes and bogs show that sea level fell from above 180 m
a.s.l. to about 80 m a.s.l. between 12 500 and 12 000 14 C years ago, to 20-30 m a.s.l. by 11 000 14C years ago, and to about 10 m a.s.l. by 10 000 14C years ago. A previously proposed secondary resubmergence of the Fraser Lowland of 100 m or more is ruled out by the radiocarbon ages and by diatom
analyses.
Red Indian Line, airborne geophysics compilation (part II, Vol 1-3), central Newfoundland
Authors: Oneschuk D , Tod J , Kilfoil G
Published: November 2010

Natural Resources Canada funded the recompilation of airborne magnetic and electromagnetic geophysical data over the Red Indian Line area of central Newfoundland as part of the national Targeted Geoscience Initiative (TGI) to stimulate mineral exploration. The
Government of Newfoundland and Labrador (GNL) supplied detailed survey data from their assessment files and the Geological Survey of Canada (GSC) contributed regional data plus their expertise for processing and compiling the data. The objective of this geophysical recompilation is to make available
to the public previously unpublished private sector data from GNL and to present it in the context of the regional magnetic coverage. These private sector surveys were submitted to GNL to meet mining claim assessment requirements. Each magnetic data set has been re-processed and merged with the GSC
regional coverage, whereas the electromagnetic (EM), magnetic vertical gradient, and altimeter data have simply been copied from the original files. This three CD set is a companion to Part I and contains six more blocks of previously unreleased data.