AndreaBozzo/ceres-open-data-index huggingface dataset:
Headwaters of the Little Chena River electromagnetic and magnetic airborne geophysical survey data compilation

The Headwaters of the Little Chena River electromagnetic and magnetic airborne geophysical survey is located in interior Alaska in the Fairbanks mining district, about 60 kilometers northeast of Fairbanks, Alaska. Frequency domain electromagnetic and magnetic data were collected with the DIGHEMV system in August 1994. A total of 135 line kilometers were collected covering 60.6 square kilometers. Line spacing was 400 meters (m). Data were collected 30 m above the ground surface from a helicopter towed sensor platform ('bird') on a 30 m long line. The data, as well as additional metadata, are available from the DGGS website: http://doi.org/10.14509/30418.

Tags: aeromagnetic, aeromagnetic data, aeromagnetic map, aeromagnetic survey, airborne geophysical survey, analytic signal, apparent resistivity data, apparent resistivity map, apparent resistivity survey, conductivity survey, electromagnetic data, electromagnetic survey, exploration, fairbanks mining district, first vertical derivative, flat creek, frequency domain electromagnetic data, frozenfoot creek, geologic, geology, geophysical map, geophysical survey, geophysics, geophysics search tag, gridded data, line data, little chena river, magnetic data, magnetic survey, magnetics, remote sensing, resistivity, resistivity survey, smith creek, sorrels creek
Organization: State of Alaska
High-resolution lidar data for infrastructure corridors, Bettles Quadrangle, Alaska

In advance of design, permitting, and construction of a pipeline to deliver North Slope natural gas to out-of-state customers and Alaska communities, the Division of Geological & Geophysical Surveys (DGGS) has acquired lidar (light detection and ranging) data along proposed pipeline routes, nearby areas of infrastructure, and regions where significant geologic hazards have been identified. Lidar data will serve multiple purposes, but have primarily been collected to (1) evaluate active faulting, slope instability, thaw settlement, erosion, and other engineering constraints along proposed pipeline routes, and (2) provide a base layer for the state-federal GIS database that will be used to evaluate permit applications and construction plans. Hillshade (shaded relief) images, produced from bare-earth DEMs provide a visual representation of topographic relief.

Tags: alaska, alaska highway corridor, alaska pipeline, bettles quadrangle, gasline, geomorphology, hillshade image, lidar, proposed natural gas pipeline, remote sensing, shaded relief, state of, topographic map, trans-alaska pipeline
Organization: State of Alaska
Top Mesozoic unconformity depth map of the Cook Inlet Basin, Alaska

Alaska Division of Oil and Gas personnel collected and interpreted various data sources related to the interpretation of the Base Tertiary unconformity surface in the Cook Inlet Basin, Alaska.Data sources included public literature, public well data information (from the AOGCC-Alaska Oil and Gas Conservation Commission), a palynology database (Greater Cook Inlet Stratigraphic Palynology Control Database and Stud,Zippi, P.A., 2006) and over 2000 miles of 2D marine seismic data (CI-88 and CI-89 licensed from, and complements of, CGGVeritas.) Interpreted formation tops of the Base Tertiary unconformity are tabulated on the map.

Tags: basins, cook inlet, cook inlet basin, depth interpretation, kenai quadrangle, mesozoic, seldovia quadrangle, structure, structure map, subsurface, tyonek quadrangle
Organization: State of Alaska
Tephra occurrence in Alaska: a map-based compilation of stratigraphic tephra data

The principal hazard associated with future explosive eruptions of Alaska volcanoes is the generation of volcanic ash clouds which are explosively blasted high into the atmosphere and then drift away from the volcano with the wind. The fragments in the ash cloud (tephra) vary in size and the heavier particles fall near the source while finer particles travel downwind. This transported tephra will fall out of the cloud and accumulate on surfaces and structures, contaminate water sources, and infiltrate electronics and motors. The weight of significant accumulations may collapse structures and cause other damage. Chronic exposure to ash may be a significant public health hazard. This publication presents the frequency and location of tephra fall throughout Alaska and into the Yukon Territory of Canada, resulting from eruptions of Alaska volcanoes from the Pleistocene to the present. The tephra occurrence map facilitates better visualization of areas in Alaska with past occurrences of ashfall. The map is a useful indicator of regional potential ashfall hazards. All files can be downloaded free of charge from the DGGS website (http://doi.org/10.14509/30059).

Tags: aerial, analyses and sampling, aniakchak, ash cloud, ashfall, augustine, coastal, coastal and river, correlation, crater peak, edgecumbe, emmons lake, environmental, eolian, fisher, geochronology, geodatabase, geologic, geologic hazards, geological process, geology, geomorphology, hayes, hazards, holocene, kaguyak, katmai, mageik, makushin, methods, mount churchill, mount edgecumbe, novarupta, okmok, pavlof, pleistocene, radiocarbon dating, redoubt, shishaldin, spurr, stratigraphy, tephra, tephrochronology, tephrostratigraphy, tuff, ukinrek, ukinrek maars, unalaska, volcanic, volcanic ash, volcanoes, volcanology
Organization: State of Alaska
Major-oxide and trace-element geochemical data from rocks collected in 2018 for the Northeast Tanacross project, Tanacross C-1, C-2, D-1, and D-2 quadrangles, Alaska

From June 19 through July 15, 2018, geologists from the Alaska Division of Geological & Geophysical Surveys (DGGS) carried out a geologic mapping and geochemical sampling project in the Northeast Tanacross map area, Tanacross D-1 and parts of C-1 and D-2 quadrangles. This area lies in the Yukon-Tanana terrane on the boundary between the Fortymile and Lake George Assemblages (Dusel-Bacon and others, 2006). It encompasses well-documented porphyry Cu-Mo-Au deposits including Taurus, Fishhook (otherwise known as SW Pika), and Pika Canyon, and is adjacent to the Fortymile Mining District. Highlights of this DGGS Northeast Tanacross geochemical report include identification, sampling, and characterization of the Taurus and Bluff prospects. This dataset has 20 samples with gold in excess of 0.1 ppm in several different locations, including a sample with 2.67 parts per million (ppm) Au (18MBW082) collected north of Taurus West, a sample with 1.2 ppm Au (18RN373) in drill core from the Bluff prospect, and 17 samples with 0.1 to 0.327 ppm Au (highest value reported for 18RN276) in drill cores from the Taurus prospect. Additionally, two samples with over 50 ppm Ag (18ET102 and 18ET307) were collected between the Pika Canyon and Fishhook Prospects. The DGGS map area includes a section of Mississippian to Devonian metasedimentary and metavolcanic rocks as well as Jurassic(?) to Tertiary intrusive and volcanic rocks. Major- and trace-element geochemistry was analyzed for metamorphic rocks to distinguish between igneous and sedimentary protoliths, and for igneous rocks to characterize and differentiate Mesozoic and Cenozoic magmatic events in the area. The analytical data tables associated with this report are available in digital format as comma-separated value (CSV) files. All files can be downloaded from the DGGS website (http://doi.org/10.14509/30113).

Tags: analyses, analyses and sampling, analytical lab results, analytical results, base metals, bluff prospect, chemistry, chicken, devonian, divide mountain, economic geology, economic study, exploration, fishhook, fishhook bend, fortymile assemblage, geochemical data, geochemical surveys, geochemistry, geologic, geology, gold bar creek, jurassic, lab methods, lake george assemblage, liberty creek, major oxides, metals, methods, mineral assessment, mineral deposit, mineral localities, mineral prospect, mineral resources, minerals, mining, minor oxides, mississippian, non-metals, ore deposit, ores, pika canyon prospect, precious metals, prindle volcano, prospecting sites, resource assessment, resource information, resources, sample location, sixtymile river, taurus prospect, tertiary, trace elements, trace geochemical, trace metals
Organization: State of Alaska
Major-oxide, minor-oxide, and trace-element geochemical data from rocks collected in the Alaska Highway corridor, Mount Hayes, Tanacross, and Nabesna quadrangles, Alaska, in 2006, 2008, 2009, and 2010

Geologists from the Alaska Division of Geological & Geophysical Surveys (DGGS) and the University of Alaska Fairbanks (UAF) carried out geologic field surveys, including bedrock mapping and sampling, in the Alaska Highway Corridor from 2006 through 2010. The fieldwork provides basic information critical to building an understanding of Alaska's geology and is part of a broader, integrated program that includes airborne geophysical surveys, bedrock and surficial mapping, a mineral-resource assessment, a geologic-hazards assessment, and other geological studies. This publication contains descriptive, location, and analytical information for samples collected in the Mount Hayes, Tanacross, and Nabesna quadrangles, Alaska, in the summers of 2006, 2008, 2009, and 2010. Additional analytical data for samples collected in the Mount Hayes Quadrangle in the summers of 2006 and 2007 were published in a separate report. During the field seasons covered by this report, rock samples were collected for geochemical trace-element and whole-rock (major- and minor-oxide and petrogenetically important trace-element) analyses. Rock sample location coordinates are presented in decimal degree latitude and longitude based on the North American Datum of 1927 (NAD 27) for Alaska. Brief sample descriptions are based principally on field observations with some thin-section details added.

Tags: alaska highway corridor, analyses, analyses and sampling, analytical lab results, analytical results, bedrock, bedrock geology, geochemical data, geochemical surveys, geochemistry, geology, major oxides, sample location, trace elements, trace geochemical, trace metals
Organization: State of Alaska
Major-oxide, minor-oxide, and trace-element geochemical data from rocks collected in the Chistochina mining district, Mount Hayes Quadrangle, Alaska, in 2005-2009

Mineral-resources personnel from the Alaska Division of Geological & Geophysical Surveys (DGGS) carried out a geological field survey, including mapping and sampling in the Chistochina mining district in the Mount Hayes A-2 and A-3 quadrangles, Alaska, from June 30 to July 15, 2009. The fieldwork provides basic information critical to building an understanding of Alaska's geology and is part of an integrated program of airborne geophysical surveys followed by geological mapping. During 2009, 57 rock samples were collected for geochemical trace-element analysis, 107 rock samples were collected for whole rock (major- and minor-oxide and petrogenetically important trace elements) analyses, and 2 samples were collected for analysis of non-carbonate carbon content. Additionally, 288 polished rock slabs were analyzed for whole rock and petrogenetically important trace elements. This report also contains geochemical trace-element analyses from the Mount Hayes A-2 Quadrangle, Alaska, for 359 rock samples collected by International Tower Hill Mines Ltd. (ITH) from July 2005 through August 2008 as part of the Chisna Project. These data were kindly donated to DGGS in 2009 to aid DGGS investigations.

Tags: alaska, alaska range, chisna, chistochina mining district, cretaceous, geochemical data, geochemistry, jurassic, major oxides, mankomen group, minor oxides, mount hayes quadrangle, nikolai greenstone, pennsylvanian, permian, platinum group elements, slate creek (mount hayes), slate creek prospect, state of, statemap project, trace elements, trace metals, triassic, wrangellia terrane
Organization: State of Alaska
Petrology and reservoir potential of Tertiary and Mesozoic sandstones, Cook Inlet, Alaska: A preliminary analysis of outcrop samples collected during 2007-2010 field seasons

The State of Alaska Division of Geological & Geophysical Surveys (DGGS) and Division of Oil & Gas (DOG) are currently engaged in a multi-year study of the hydrocarbon potential of the Tertiary and Mesozoic strata in Cook Inlet basin. Modal analyses and routine core analyses were performed on Tertiary and Mesozoic siltstones and sandstones collected during the 2007-2010 field seasons from six geographic areas in upper and lower Cook Inlet. The reservoir quality of Cook Inlet sandstones varies widely depending on their mineralogy, geologic age, burial depth, and depositional environment. Tuxedni and Naknek sandstones have poor reservoir quality and are likely to be of equally poor quality down dip. West Foreland sandstones examined have poor reservoir quality and are negatively influenced by their immature volcanic mineralogy. The Hemlock and Tyonek sandstones have good to excellent reservoir quality, largely resulting from their quartzose-feldspathic mineralogy that is physically and chemically stable and burial depths generally less than 3,000 m. It should be emphasized that our observations are based on a limited number of outcrop samples collected from widely dispersed localities.

Tags: alaska range batholith, aleutian arc, beluga basin, beluga formation, bluff point, capps glacier, chert, chisik member, chugach terrane, chuitna river, clam gulch, cook inlet, cook inlet basin, diagenesis, early cretaceous, early jurassic, eocene, falls creek, feldspar, fritz creek, graywacke, hemlock formation, homer, iniskin bay, iniskin peninsula, kachemak bay, kaguyak, kaguyak formation, kahiltna terrane, late cretaceous, late jurassic, matanuska formation, matanuska valley, mineralogy, miocene, naknek formation, neogene, oil and gas, oil and gas basin, oil basins, oligocene, outcrop samples, paleogene, permeability, petrographic, petrography, petroleum basin study, petrology, pliocene, pomeroy arkose member, porosity, provenance, pyroclastic fall, pyroclastic flow, quartz, reservoir, reservoir evaluation, reservoir quality, resource assessment, saddle mountain, sample location, sample location map, sand, sand and gravel, sediment transport, sedimentary, sedimentary rocks, sedimentation, sedimentology, seward peninsula, southcentral alaska, sterling formation, straight creek, talkeetna formation, tectonics, tertiary, thin section, tuxedni group, tyonek, tyonek formation, tyonek quadrangle, volcanic, volcanic ash, volcaniclastics, west foreland formation, zeolites
Organization: State of Alaska
High-resolution lidar data for infrastructure corridors, Nabesna Quadrangle, Alaska

In advance of design, permitting, and construction of a pipeline to deliver North Slope natural gas to out-of-state customers and Alaska communities, the Division of Geological & Geophysical Surveys (DGGS) has acquired lidar (Light Detection and Ranging) data along proposed pipeline routes, nearby areas of infrastructure, and regions where significant geologic hazards have been identified. Lidar data will serve multiple purposes, but have primarily been collected to (1) evaluate active faulting, slope instability, thaw settlement, erosion, and other engineering constraints along proposed pipeline routes, and (2) provide a base layer for the state-federal GIS database that will be used to evaluate permit applications and construction plans. The highest-hit digital surface models (DSM) represent the earth's surface with all vegetation and human-made structures included.

Tags: alaska, alaska highway corridor, alaska pipeline, gasline, geomorphology, highest hit digital surface model (dsm), lidar, nabesna quadrangle, proposed natural gas pipeline, raster image, remote sensing, state of, trans-alaska pipeline
Organization: State of Alaska
Surficial-geologic map of the Eagle A-1 Quadrangle, Fortymile mining district

Preliminary Interpretive Report 2002-1C, Surficial-geologic map of the Eagle A-1 Quadrangle, Fortymile mining district, provides 1:63,360-scale geologic mapping of the Eagle A-1 Quadrangle. The area is part of the 100-year old Fortymile mining district and is located in eastern Alaska near the Alaska-Yukon border. This map illustrates the distribution of a variety of unconsolidated deposits and undifferentiated bedrock in the Eagle A-1 Quadrangle, Fortymile mining district. It was prepared by the interpretation of 1:63,360-scale, false-color, infrared aerial photographs taken from July 1978 through August 1981 and is locally verified by ground observations during field visits.The results should be considered reconnaissance in nature. The dominant unconsolidated deposit is colluvium, which mantles most surfaces other than the tops of ridges and those areas immediately adjacent to streams. Three levels of stream terrace can be traced along major drainages at elevations of roughly 200, 100, and 30 meters above modern streams. A fourth low terrace is limited to the southwest part of the map area. Pleistocene mammalian remains have been recovered from ice-rich organic silt and muck overlying placer gravels in many valleys. The complete report, geodatabase, and ESRI fonts and style files are available from the DGGS website: http://doi.org/10.14509/22081.

Tags: alaska, alluvial deposits, bison fossils, boundary (place), caribou fossils, cenozoic, colluvial deposits, complex deposits, dggs, eagle quadrangle, fortymile mining district, fortymile river, gems, gems ncgmp09, geologic map, geology, glacial deposits, holocene, horse fossils, jack wade junction, mammoth fossils, man-made deposits, mining, pleistocene, quaternary, sheep fossils, state of, statemap project, steele creek dome, surficial, surficial geologic map, surficial geology, tailings, taylor highway, terrace, tertiary, top of the world highway, unconsolidated deposits, walker fork
Organization: State of Alaska
Shoreline change at Alaska coastal communities, Levelock, Alaska

The Division of Geological & Geophysical Surveys has analyzed long-term shoreline change at 48 Alaska communities. Shoreline datasets were compiled from previously published U.S. Geological Survey assessments and created from historical and recent aerial images by the Alaska Division of Geological & Geophysical Surveys. Shorelines were analyzed to calculate shoreline change rates every 25 meters along coastlines and tidally influenced riverbanks using the Digital Shoreline Analysis System (DSAS; Himmelstoss and others, 2018). The geodatabase for each community includes shoreline positions, the alongshore baseline used to cast transects, and transects that include shoreline change rates and statistics. All files can be downloaded free of charge from the Alaska Division of Geological & Geophysical Surveys website (http://doi.org/10.14509/30552).

Tags: aerial, aerial photography, alaska, coastal, dggs, emergency preparedness, engineering, environmental, erosion, flood, floodplain, geology, hazards, inundation, levelock, marine geology, outreach, sea level changes, shelf, shoreface, storm surge, surface, tides, topography, water
Organization: State of Alaska
Geologic Photos of Alaska

The Geologic Photos of Alaska database and online application contains photographs taken during and in support of Alaska Division of Geological & Geophysical Surveys (DGGS) projects. These photographs primarily document field sites and geomorphology statewide, usually in remote locations that are often impossible or prohibitively expensive to revisit. The database (http://maps.dggs.alaska.gov/photodb/) includes a variety of images such as field photos, photos of samples, and photomicrographs (photograph of a microscopic object) taken with the aid of a microscope.

Tags: alaska, alaska statewide quadrangle, analyses and sampling, energy resources, geologic, geologic hazards, geologic materials, geological process, geology, geomorphology, glaciers, igneous rocks, metamorphic rocks, mineral resources, resource information, resources, rock units, rocks, sample location, sand and gravel, sedimentary rocks, state of, structural geology, structure, volcanic rocks, volcanoes
Organization: State of Alaska
Spatially referenced oblique aerial photography of the Eastern Norton Sound shoreline, July 2011

In July 2011, a helicopter-based crew photographed approximately 180 miles of shoreline along the eastern edge of Norton Sound, from Cape Denbigh to south of Unalakleet, AK. During this flight 2,180 oblique aerial photographs were collected and spatially referenced using a Garmin Dakota 20, handheld GPS. The communities of Unalakleet and Shaktoolik lie along the flight-line of this project.

Tags: aerial photography, beach deposits, coastal, coastal erosion, geomorphology, holocene, norton bay quadrangle, norton sound, shoreface, unalakleet quadrangle
Organization: State of Alaska
Alaska merged geophysical data grids

Merged grids of residual magnetic intensity and apparent resistivity compiled from the Wrangellia, Iron Creek, Southern Delta River, Valdez Creek, and Nikolai geophysical surveys.

Tags: airborne geophysical survey, alaska, electromagnetic data, electromagnetic survey, geophysical map, geophysical survey, geophysics, geophysics search tag, gridded data, magnetic data, magnetic survey, magnetics, state of
Organization: State of Alaska
Electron probe microanalytical data of minerals and glass from rock samples from Pavlof Volcano, Alaska

Electron probe microanalytical data of minerals and glass from rock samples from Pavlof Volcano, Alaska, Raw Data File 2022-7, presents electron microprobe analytical data from minerals from lava samples collected at Pavlof Volcano by Alaska Volcano Observatory (AVO) geologist Jessica Larsen during fieldwork in 2017 and from tephra samples described in Waythomas and others (2017). Samples include those produced during recent eruptions of Pavlof in 1986, 1996, 2007, 2013, 2014, and 2016. Pavlof Volcano is an undissected stratovolcano located approximately 58 km northeast of Cold Bay, in the southwestern portion of the Alaska Peninsula. Electron probe micro-analysis (EPMA) data are reported from the major mineral phases: orthopyroxene, clinopyroxene, olivine, plagioclase, and magnetite. Sample descriptions, locations, and types are included in the metadata associated with the analytical data table. The data are available from the DGGS website: http://doi.org/10.14509/30854.

Tags: active volcanoes, alaska peninsula, analyses, analyses and sampling, analytical lab results, andesite, ashfall, basalt, dggs, geology, holocene, lava flow, mineral composition, mineralogy, pavlof volcano, surface, tephra, volcanic, volcanic ash, volcanic eruption, volcanic rocks, volcaniclastic deposits, volcaniclastics, volcanoes, volcanology
Organization: State of Alaska
Alaska merged geophysical data grids

This magnetic anomaly map of Alaska provides a statewide view of magnetic anomalies in Alaska. This composite magnetic anomaly grid is a merge of the available, public-domain, digital, magnetic surveys for the state of Alaska as of 2015. The grid was compiled by Richard Saltus (USGS). The data, as well as additional metadata, are available from the Alaska Division of Geological & Geophysical Surveys website: http://dggs.alaska.gov/pubs/id/29555

Tags: airborne geophysical survey, alaska, electromagnetic data, electromagnetic survey, geophysical map, geophysical survey, geophysics, geophysics search tag, gridded data, magnetic data, magnetic survey, magnetics, state of
Organization: State of Alaska