AndreaBozzo/ceres-open-data-index huggingface dataset:
Differential uplift across the Coast Plutonic Complex-Northern Stikine Terrane contact, Yukon: Preliminary evidence from apatite fission-track thermochronometry

Six fission-track analyses were conducted on samples taken across a fault in the Takhini Hotsprings area, Yukon. The results indicate that samples taken on the east side of the fault cooled through 100°C at 104.4 ± 11.9 Ma, while the samples taken on the west side of the fault cooled through 100° C at 63.9 ± 8.5 Ma. Differential uplift and faster erosion on the west side of the fault between the mid-Cretaceous and Early Paleocene could account for this difference in cooling history. This fault forms the approximate western edge of the Whitehorse Trough, and is marked by a dramatic change in the isopach of Jurassic and Triassic sedimentary and volcanic rocks which form a thin veneer over rocks of the Coast Plutonic Complex on the west side, and a very thick sedimentary sequence on the east side where basement rocks are not seen. Based on these observations, the fault is inferrred to be a major zone of crustal weakness which could form the boundary betweeen the Northern Stikine Terrane and the Coast Plutonic Complex in southern Yukon.

Similar results were obtained in a previous study of samples collected across the Llewellyn Fault Zone, which forms the boundary between the Northern Stikine Terrane and rocks of the Nisling Terrane and Coast Plutonic Complex in northwest B.C.

Organization: Government of Yukon | Gouvernement du Yukon
The Wolf property - 1998 update: Volcanogenic massive sulphides hosted by rift-related, alkaline, felsic volcanic rocks, Pelly Mountains, Yukon

The Wolf property is situated within the Pelly Mountains, 90 km south of Ross River, Yukon. The Mississippian felsic volcanic and sedimentary rocks which underlie the Wolf property are part of a belt that occurs within the Pelly-Cassiar platform, a miogeoclinal sequence thought to be part of ancestral North America. Much of the bedrock exposure in the region is along the northeastern edges of southwesterly dipping, imbricate thrust sheets. The felsic volcano-sedimentary sequence on the Wolf property is approximately 900 m thick and bounded by two thrust panels of lower Paleozoic platformal carbonate sequences. Volcanic stratigraphy is characterized by high potassium geochemistry, a variety of pyroclastic grain sizes, and high-energy fragmental and low-viscosity flow textures. The chemistry of the volcanic rocks and their tectono-stratigraphic setting indicates deposition within an intra-continental rift.

Volcanogenic sulphide mineralization and exhalative barite occur at four stratigraphic levels within the Wolf property. The Wolf deposit is hosted within a laterally extensive sheet of massive sulphide mineralization at the upper stratigraphic level and has been defined by 30 diamond-drill holes over a 600 m strike length and a 500 m width (down-dip). Thickness of zinc, lead and silver bearing massive sulphide ranges from 2 to 25 m. A bulk of the deposit is contained within a higher grade ""keel"" that has a strike length of 125 m, a down-dip length of 400 m, an average thickness of 12 m and dips 45 degrees to the south. The deposit has an inferred resource of 4.1 million tonnes grading 6.2% Zn, 1.8% Pb and 84 g/t Ag, and is open along strike and down-dip. Exploration potential of the property has been enhanced by the discovery of the East Slope zone, 1200 m east of the Wolf deposit. Chemical
zoning within the mineralization and peripheral alteration, and deposit morphology indicate that stratigraphy may be overturned.

Organization: Government of Yukon | Gouvernement du Yukon
Surficial geology of Kiyera Lake (115G/15), Yukon (1: 50 000 scale).

The Kiyera Lake map area straddles the northwestern extent of the Nisling Range. Broad treeless uplands dominate the landscape with summits reaching above 1800 m above sea level. Upland surfaces are characterized by weathered bedrock colluvium, tors and sporadically distributed till deposits from former alpine glaciers in cirques. Upland surficial materials are affected by active periglacial processes such as cryoturbation, nivation and solifluction.

Organization: Government of Yukon | Gouvernement du Yukon
First vertical derivative of the magnetic field, McQuesten Aeromagnetic Survey, NTS 115P/11 and 115P/12, Yukon

Map of the first vertical derivative of the magnetic field derived from data acquired during an aeromagnetic survey carried out by Goldak Airborne Surveys from November 19, 2008 to February 19, 2009. The data were recorded using a split-beam cesium vapour magnetometer mounted in the tail boom of a Piper Navajo aircraft.

Organization: Government of Yukon | Gouvernement du Yukon
Yukon Exploration and Geology 1995

Yukon Exploration and Geology 1995 consists of three parts; Part A is a comprehensive overview of mining and exploration activity in Yukon, Part B summarizes the activities of the Exploration and Geological Services Division (EGSD) of the Northern Affairs Program, Yukon Region and the activities of the Canada/Yukon Geoscience Office, and Part C which documents significant new geoscientific information gathered by EGSD geologists, Canada/Yukon Geoscience Office geologists and affiliated geologists.

Organization: Government of Yukon | Gouvernement du Yukon
Analysis of geoscience data for geothermal exploration along the Teslin fault near Teslin, Yukon

In collaboration with the Yukon Geological Survey, Teslin Tlingit Council, and other project partners, Innovate Geothermal Ltd. performed an analysis of geoscience data in south-central Yukon as part of an effort to better understand the potential for geothermal energy resources that, if present, could be utilized to help reduce fossil fuel use in Yukon communities. The study area for this project is located near the Village of Teslin and straddles the Teslin fault zone. The main aim of this project is to analyze and interpret a variety of pre-existing and newly acquired geologic and geophysical data sets to evaluate whether geothermal reservoirs may be present within the study area. A secondary aim is to propose favourable drilling locations, if warranted, for exploratory wells to collect information on subsurface temperature and permeability. The geoscience work accomplished here includes both 2D map interpretation as well as construction of a 3D geologic model that was guided by geophysical inversion modelling of gravity and magnetic survey data. In the Teslin study area, the distribution of temperature in the subsurface remains a significant unknown; however, limited evidence suggests subsurface temperatures are modestly above average. Specifically, regional-scale, Curie point depth estimates suggest the geothermal gradient in the area is ~45 °C/km. Drilling is required to measure actual subsurface temperature gradients in the vicinity of Teslin. Furthermore, subsurface permeability does appear possible in the study area. Analysis of 
 the geoscience data shows evidence for a complex structural environment that appears favourable for subsurface fracture permeability in the Teslin fault zone area. In addition, geologic mapping and geophysical modelling suggests that large portions of the Teslin study area are underlain by quartzite and volcanic bedrock. Both rock types have a favourable potential for maintaining open fractures. Many unknowns regarding the temperature and permeability of the subsurface still exist in the Teslin study area. The location of a 500 m deep scientific research well is proposed to help answer many of the remaining questions.

Organization: Government of Yukon | Gouvernement du Yukon
Structural controls on alteration and mineralization at the Coffee gold deposits, Yukon

The Coffee gold deposits are controlled by east and north-striking structures that initiated in the Jurassic and were re-activated in the Cretaceous. Cretaceous igneous rocks and Jurassic-altered Paleozoic rocks were overprinted by Late Cretaceous (or younger) gold mineralization and the paragenetic sequence for the main prospects has been established. Jurassic alteration is characterized by zones of pervasive quartz sericite alteration of metamorphic minerals and disseminated brassy pyrite. Jurassic pyrite is locally anomalous in gold, but is generally barren. Cretaceous gold mineralization overprints Jurassic sericite alteration and is characterized by veins and breccia infilled with gold-bearing, dark grey, ‘sooty’ arsenian pyrite. In biotite-rich host gneiss, disseminated arsenian pyrite extends outwards from fracture zones along biotite-rich metamorphic foliation and pre-existing Jurassic shears. In altered Late Cretaceous igneous rocks, gold-bearing arsenian pyrite replaces primary biotite. Compared to other nearby prospects, the Coffee gold project is most similar to the Boulevard trend but textures suggest it formed at shallower levels.

Organization: Government of Yukon | Gouvernement du Yukon
Reconnaissance geology of northern Toobally Lake (95D/8), southeast Yukon

The Toobally fault is a north-trending structure occurring along the west shore of northern Toobally Lake (95D/8) that juxtaposes Neoproterozoic-Cambrian sedimentary and volcanic rocks (to the west) against Devonian-Carboniferous sedimentary rocks (to the east). Paleozoic units east of the fault are tentatively correlated with an unnamed Devonian limestone, Besa River Formation and Mattson Formation, and are interpreted to form an asymmetric, east-verging anticline-syncline fold couplet with a sub-vertical common limb. Older units west of the fault constitute a homoclinal westdipping succession consisting of (from oldest to youngest) an unnamed quartz sandstone, a diamictite and a basalt. The diamictite is a previously unrecognized unit, estimated to be at least 1800 m thick, for which we propose the name Toobally Formation. It is tentatively correlated with Ice Brook and Vreeland formations and is considered to be a glaciomarine succession in uppermost Windermere Supergroup. Overlying the Toobally Formation is an 850-m-thick succession of Neoproterozoic-Cambrian(?) basalt. The geochemistry of these basalts is consistent with rift volcanism in a within-plate tectonic setting.

Organization: Government of Yukon | Gouvernement du Yukon
Hydrocarbon potential of Upper Paleozoic strata, eastern Richardson Mountains, northern Mackenzie Mountains and Peel Plateau, Yukon.

Upper Paleozoic strata in the eastern Richardson Mountains, northern Mackenzie Mountains and Peel Plateau of the Yukon consist of basinal sediments overlain by a siliciclastic sedimentary wedge derived from the Late Devonian Ellesmerian orogeny. Unconformably overlying Paleozoic strata in the Peel Plateau are Cretaceous sedimentary rocks that were deposited in the foreland basin of the Cretaceous Cordilleran orogeny.

This study, as part of the interdisciplinary “Regional Geoscience Studies and Petroleum Potential, Peel Plateau and Plain” project, examines the sedimentology, stratigraphy and hydrocarbon potential of Upper Paleozoic strata in the Peel region and adjacent Richardson and Mackenzie mountains. Units investigated as part of this study include the Canol (Upper Devonian), Imperial (Upper Devonian) and Tuttle (Upper Devonian-Lower Carboniferous) formations, ‘Cf’ map unit (?Upper Devonian-Lower Carboniferous), and ‘Mo’ map unit (?Upper Devonian-Lower Carboniferous). Preliminary analyses suggest the Canol, Imperial, Tuttle, ‘Cf’ and ‘Mo’ are potential hydrocarbon source rocks for the region. The Tuttle Formation is the best prospective reservoir rock of the Upper Paleozoic strata.

Organization: Government of Yukon | Gouvernement du Yukon
Gold-Silver Deposits and Occurrences in Yukon Territory

Map and report listing information on 419 mineral ocurrences in Yukon that contain noteworthy amounts of gold and/or silver. A capsule description of the occurrence's geology is present along with a list of the significant ore minerals. This is followed by information on the metal content of the occurrence and extent of exploration and development work. Accompanying this report is a 1:2,000,000-scale map of gold-silver deposits and occurrences in the Yukon Territory.

Organization: Government of Yukon | Gouvernement du Yukon
Geology of the Keno Hill district

This map is based on 1:5000-scale geological mapping on a detailed topographic base, which included checking previous maps available in the archives of United Keno Hill Mines. In covered areas, the geology is derived from an analysis of about 9000 historic overburden boreholes, totaling approximately 250000 m, and 793 historic surface and near-surface boreholes, totaling 46748 m, on 1:1000-scale maps. The results of Alexco Resource Corp. surface diamond drilling of 197565 m in 759 holes, between 2006 and the end of 2019, are also incorporated in these maps and sections. On Galena Hill, a helicopter magnetic and resistivity survey on a 50 m line spacing allowed the extension of geologic structures into outcrop-free areas that have not been drilled.

Organization: Government of Yukon | Gouvernement du Yukon
Thermal history of Carlin-type gold deposits in Yukon (Canada) as revealed by organic matter geothermometry, clumped isotope data, fluid inclusion microthermometry, and apatite fission-track analyses

Sediment-hosted gold deposits in central Yukon have most of the diagnostic characteristics of Carlin-type gold deposits in Nevada. This study combines organic matter geothermometry with fluid inclusion microthermometry, clumped isotope data (Δ47) for late ore-stage hydrothermal calcite, and apatite fission-track analyses to constrain the thermal evolution of Carlin-type gold zones in central Yukon. The Tmax parameter derived from pyrolysis analyses indicates that organic matter is overmature and records regional temperatures of > 150 °C. Calcite and fluorite associated with the waning stage of mineralization at ca. 74 Ma have mean fluid inclusion homogenization temperatures of 123–173 °C, with an average salinity of 4.8 wt.% NaCl equiv. These temperatures overlap values of 91–162 °C determined from calcite clumped isotope measurements and are similar to data from Carlin-type deposits in Nevada. Fluid mixing is suggested by a variation of the isotopic composition of the fluid in equilibrium with calcite, with the higher temperature end-member having higher δ18OH2O values. In thermal models based on Tmax, fluid inclusion microthermometry, clumped isotope measurements, and apatite fission-track data, a higher temperature event at approximately 220 °C is consistent with pyrobitumen reflectance measurements. This event is either related to maximum tectonic burial prior to mineralization or to the flow of acidic hydrothermal fluids early in the main ore-stage. Each analytical technique used in this study is independent of the others and records part of the thermal and chemical evolution of the Yukon Carlin-type gold deposits and their host rocks.

Organization: Government of Yukon | Gouvernement du Yukon
Moss Mats as Medium for Stream Sediment Geochemistry

This project involved the collection of moss mat samples from sites throughout Yukon. Sites included: Laura Creek, which drains Brewery Creek gold deposit; Logjam Creek, draining the Logtung tungsten and molybdenum occurrence; Williams Creek which drains the Williams Creek copper deposit; the Vancouver Creek placer drainage; and Eldorado Creek in the Klondike goldfields.

Organization: Government of Yukon | Gouvernement du Yukon
Yukon Exploration and Geology 1998

Yukon Exploration and Geology 1998 consists of four parts: Part A is a comprehensive overview of mining and exploration activity in the Yukon; Part B outlines the activity and organization of the Yukon Geology Program; Part C contains regional reports from new government mapping, geochemical and geophysical studies, as well as some placer deposit studies; and Part D is a collection of reports by industry and government geologists on new mines and mineral occurrences with recent exploration advances.

Organization: Government of Yukon | Gouvernement du Yukon
First vertical derivative of the magnetic field, McQuesten Aeromagnetic Survey, NTS 115P/5, 115O/8 and part of 115O/7, Yukon

Map of the first vertical derivative of the magnetic field derived from data acquired during an aeromagnetic survey carried out by Goldak Airborne Surveys from November 19, 2008 to February 19, 2009. The data were recorded using a split-beam cesium vapour magnetometer mounted in the tail boom of a Piper Navajo aircraft.

Organization: Government of Yukon | Gouvernement du Yukon
Cirque forms and alpine glaciation during the Pleistocene, west-central Yukon

Uplands in west-central Yukon supported alpine ice centres during the pre-Reid glaciations (Early Pleistocene). Subdued cirque forms are thought to be glacial cirques that have undergone degradation by nivation. The paleo-equilibrium line altitude (ELA) dropped as low as 1054 ± 96 m in the Crag Mountain upland (CMU). A pre-Reid age for the CMU cirques is based upon the presence of an Early-Middle Pleistocene paleosol in a moraine feature. Cirques in the Ogilvie Mountains provide proxy ELAs for the Reid (mean 1391 ± 132 m) and McConnell (mean 1488 ± 103 m) glaciations. Cirque glaciers did not form in CMU and most of Dawson Range during these later
glaciations due to a decrease in precipitation. It is suggested that the progressive marginality of cirque glaciation through the Middle and Late Pleistocene may be related to the progressive enlargement of precipitation-diverting continental ice sheets east of the Cordillera.

Organization: Government of Yukon | Gouvernement du Yukon
Aeromagnetic Total Field, Yukon Territory, NTS 106F/NE-NW

This map was compiled from data obtained as a result of an aeromagnetic survey carried out by Fugro Airborne Surveys using a Cessna Caravan (registration C-FZLK) aircraft. A 0.005 nT sensitivity split-beam cesium vapour magnetometer was mounted in the tail boom of the survey aircraft. 
The survey operations were carried out from March 7 to May1, 2003. The nominal traverse line spacing was 800 m with control lies at 2.4 km spacing at a nominal terrain clearance of 200 m. A preplanned flight surface was calculated for this survey to minimize the control line and traverse line altitude differences. Flight path was recovered using a post flight differential Global Positioning System, combined with a vertically mounted video camera.
After editing the survey data, the intersections of the control and traverse lines were established and differences in the magnetic values were computer analysed and manually checked to obtain the level network. The levelled total field values were then interpolated to a 200 m grid. The International Geomagnetic Reference Field has not been removed from the magnetic total field.

Organization: Government of Yukon | Gouvernement du Yukon
What about those emeralds, eh? Geological setting of emeralds at Regal Ridge (SE Yukon) provides clues to their origin - and to other places to explore

In 1998, a new occurrence of emeralds was discovered in Finlayson Lake area, southeastern Yukon. Emeralds occur in the alteration selvages of quartz-tourmaline (-scheelite-muscovite-beryl) veins that cut biotite-chlorite metavolcanic schist in the metamorphic aureole around one of the area's largest bodies of mid-Cretaceous granite. In the area of the showing, the mafic schist, part of the widespread Upper Devonian Fire Lake unit, is meta-basalt of boninitic composition which overlies a thick, laterally tapering slab of variably serpentinized mafic and ultramafic meta-plutonic rocks. Using various geometric and geological criteria, this slab is inferred to be a sill, comagmatic with the Fire Lake unit, which intruded laterally from feeder dykes localized along a nearby synvolcanic fault.

Organization: Government of Yukon | Gouvernement du Yukon
Earthquake Relocations Delineate a Discrete Fault Network and Deformation Corridor Throughout Southeast Alaska and Southwest Yukon

Deformation in southeastern Alaska and southwest Yukon is governed by the subduction and translation of the Pacific-Yakutat plates relative to the North American plate in the St. Elias region. Despite notable historical seismicity and major regional faults, studies of the region between the Fairweather and Denali faults are complicated by glacial coverage and the remote setting. In the last decade, significant improvements have been made to the density of regional broadband seismometer networks. We relocate more than 5,000 earthquakes between 2010 and 2021 in the region of southeastern Alaska and southwestern Yukon utilizing these improved seismic networks. With reductions in catalog uncertainty, particularly in depth, we quantify the thickness of the seismogenic layer in the crust throughout the region and locate seismicity on a shallow network of upper-crustal faults. Relocated earthquakes, combined with an updated focal-mechanism catalog, permit estimating and classifying motion of active faults. This includes mapping the Totschunda-Fairweather “Connector” fault, which plays an important role in explaining regional deformation, and identifying new faults like the Kathleen Lake fault. We draw similarities between our seismic observations and simplified conceptual models of regional tectonics, which describe a dominant transpressional regime and localized slip partitioning. Our results support a hypothesis where current deformation is taking place on a well-defined and evolved network of shallow faults in the corridor between the Totschunda-Fairweather “Connector” and Denali faults.

https://doi.org/10.1029/2023TC008140

Organization: Government of Yukon | Gouvernement du Yukon
Surficial geology of Toshingermann Lakes (115G/14), Yukon (1: 50 000 scale)

The Toshingermann Lakes map area straddles the northwestern extent of the Ruby and Nisling ranges. Broad treeless uplands dominate the landscape and summits reach more than 1800 m above sea level. Upland surfaces are covered with weathered bedrock colluvium and sporadically distributed till deposits from alpine glaciers and ice sheets. Upland surficial deposits are affected by active periglacial processes such as cryoturbation, nivation and solifluction.

Organization: Government of Yukon | Gouvernement du Yukon
Preliminary geology of the Quill Creek map area, southwest Yukon parts of NTS 115G/5, 6 and 12

Geologic mapping within the Quill Creek area identified complex stratigraphic and structural relationships that characterize much of the Kluane Ranges in southwest Yukon. Bedrock in the Quill Creek area consists of Late Paleozoic to mid-Mesozoic volcanic and sedimentary rocks belonging to the Wrangellia Terrane. These rocks are intruded by Upper Triassic mafic and ultramafic sills and dykes and Early Cretaceous to Oligocene granitic rocks. At least two phases of folding are recognized that affect rocks throughout the mapped area. Early phase folds are likely associated with large, low-angle thrust faults. Reactivation of thrusts during younger strike-slip faulting may be responsible for refolding of the early folds. Several known mineralized showings occur within the Quill Creek area, including extensive nickelcopper- platinum group element mineralization associated with the ultramafic sills. Samples collected during 2004 mapping indicate potential for copper-silver mineralization at the base of Upper Triassic volcanic rocks.

Organization: Government of Yukon | Gouvernement du Yukon