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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...
Tags: Alaska Range,
Alaska, State of,
Chisna,
Chistochina Mining District,
Geochemical Data, All tags...
Geochemistry,
Major Oxides,
Minor Oxides,
Mount Hayes Quadrangle,
Platinum Group Elements,
STATEMAP Project,
Slate Creek (Mount Hayes),
Slate Creek Prospect,
Trace Elements,
Trace Metals,
geoscientificInformation, Fewer tags
Mineral-resources personnel from the Alaska Division of Geological & Geophysical Surveys carried out a geological field survey, including mapping and sampling near Livengood in the Livengood B-3 and B-4 quadrangles, Alaska from June 10 to June 30, 2010. 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 2010, 130 rock samples were collected for geochemical trace-element analysis, and 20 rock samples were collected for whole rock (major- and minor-oxide) analysis. Petrogenetically important trace elements for additional rock samples will be analyzed and published...
Tags: Alaska, State of,
Brooks Creek,
Cascaden Ridge,
Cleary Creek,
Eagle Creek, All tags...
Elliot Highway,
Ester Creek,
Geochemistry,
Livengood,
Livengood Creek,
Livengood Quadrangle,
Major Oxides,
McCord Creek,
Minor Oxides,
Olive Creek,
Ranney Hollow,
Shorty Creek,
Slate Creek,
Steel Creek,
Tolovana Hot Springs,
Tolovana Hot Springs Dome,
Tolovana River,
Trace Metals,
Trans-Alaska Pipeline,
West Fork Tolovana River,
Wilber Creek,
Winter Creek,
geoscientificInformation, Fewer tags
Mineral-resources geologists from the Alaska Division of Geological & Geophysical Surveys (DGGS) carried out a helicopter-supported geological and geochemical resource assessment project in the Gulkana, Healy, Mount Hayes, and Talkeetna Mountains quadrangles from July 29 through August 16, 2013. The objectives of this assessment were to improve the publicly-available geological, geophysical, and geochemical data in the area of known occurrences in the Mount Hayes Quadrangle, and to extend this coverage and any gained insight westward into the less-explored extension of the Wrangellia terrane. This program of stream-sediment, pan-concentrate, and rock sampling was conducted as part of the State's Strategic Minerals...
Tags: Amphitheater Mountains,
Copper,
Geochemical Data,
Geochemical Surveys,
Geochemistry, All tags...
Gold,
Greenstone,
Gulkana Quadrangle,
Healy Quadrangle,
Mount Hayes Quadrangle,
Nickel,
Pan Concentrates,
Platinum Group Elements,
Rare Earth Elements,
Silver,
Strategic and Critical Minerals Assessment Project,
Stream Sediments,
Talkeetna Mountains,
Talkeetna Mountains Quadrangle,
Trace Elements,
Ultramafic,
geoscientificInformation, Fewer tags
Twenty-two igneous and metamorphic rock samples were collected in a 20-km-long swath centered on the Alaska Highway between Tetlin Junction, Alaska, and the Canada border. Igneous and metamorphic rock samples were submitted to the Apatite to Zircon, Inc. laboratory (A2Z), where zircon U-Pb age analysis, using laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS), was performed by Paul O'Sullivan. The 15 felsic plutonic rock samples and one gabbro sample yield Cretaceous zircon U-Pb weighted-mean ages ranging from 95.7 Ma to 106.2 Ma. Zircons from a metadiorite yield a Triassic weighted-mean age of about 241.9 Ma. Metamorphic zircons from two samples with felsic igneous protoliths yield Mississippian...
Tags: Age Dates,
Alaska Highway Corridor,
Analyses and Sampling,
Bedrock,
Bedrock Geology, All tags...
Detrital Zircon,
Geochronology,
Geology,
Igneous Rocks,
Isotopes,
Metamorphic Rocks,
Nabesna Quadrangle,
Tanacross Quadrangle,
U-Pb,
geoscientificInformation, Fewer tags
Cook Inlet has been recognized as the second-largest petroleum province in Alaska, second only to the North Slope. The south-central Tyonek Quadrangle is an area of significant geologic interest because it is the only location in Cook Inlet where the entire producing stratigraphy of the basin is exposed on the surface. Additionally, this area encompasses the structural boundary between the forearc basin and its sediment source rocks. To better understand the petroleum system and the geologic relationships between the exhumed arc intrusive rocks and adjacent Cenozoic stratigraphy of the Cook Inlet forearc basin, during the summer of 2010 the Alaska Division of Geological & Geophysical Surveys conducted a federally-funded...
Tags: Alaska Range,
Analyses,
Analyses and Sampling,
Analytical Lab Results,
Analytical Results, All tags...
Bedrock,
Bedrock Geology,
Chemistry,
Cook Inlet,
Cook Inlet Basin,
Exploration,
Geochemical Data,
Geochemical Surveys,
Geochemistry,
Geology,
Igneous,
Igneous Rocks,
Lab Methods,
Magmatic Arc,
Major Oxides,
Minor Oxides,
Neacola Mountains,
Petrology,
Resources,
Rocks,
STATEMAP Project,
Sample Location,
Tordrillo Mountains,
Trace Elements,
Trace Geochemical,
Tyonek,
Tyonek Quadrangle,
Volcanic,
Volcanic Arc,
Volcanic Rocks,
geoscientificInformation, Fewer tags
Mineral Resources Section personnel from the Alaska Division of Geological & Geophysical Surveys (DGGS) carried out a geologic field survey, including mapping and sampling, in the eastern part of the Bonnifield mining district in the Fairbanks A-1 and A-2 and the Healy D-1 and D-2 quadrangles, Alaska, from June 16 through July 18, 2008. 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 geologic mapping. Specifically, this work provides geologic context for geophysical surveys conducted in 2006. Interpretation and synthesis of this data has been presented in professional and trade meetings....
Tags: Alaska Range,
Bedrock,
Chute Creek,
Dry Creek,
Dry Creek prospect, All tags...
Fairbanks Quadrangle,
Geologic,
Geology,
Glory Creek,
Glory Creek prospect,
Healy Quadrangle,
Igneous,
Igneous Rocks,
Kansas Creek,
Minerals,
Red Mountain Creek,
Rocks,
Rogers Creek,
STATEMAP Project,
Sedimentary Rocks,
Sheep Creek,
Slide Creek,
Snow Mountain Gulch,
WTF (Western Tundra Flats) prospect,
Wood River,
geoscientificInformation, Fewer tags
40Ar/39Ar analyses were performed on igneous rocks from the Ray Mountains area of west-central Alaska. The plutonic samples have ages from about 89 Ma to 109 Ma, while the volcanic samples show ranges from about 30 Ma to 64 Ma. The three volcanic samples fall into two age groups: the younger sample, a basalt, has an age of about 30 Ma, while the two older, rhyolitic samples fall between 58 Ma and 64 Ma. Analyses were performed by the University of Alaska Fairbanks Geochronology Laboratory, and results were reported by Paul Layer and Jeff Benowitz. Products included in this data release are: a summary of sample collection method; the laboratory report, analytical data tables and associated metadata; and plots of...
Tags: 40Ar/39Ar,
Age Dates,
Analyses,
Analyses and Sampling,
Analytical Lab Results, All tags...
Analytical Results,
Ar-Ar,
Bedrock,
Bedrock Geology,
Bettles Quadrangle,
Geochronology,
Geology,
Lab Methods,
Mineral Assessment,
Mineral Deposit,
Mineral Resources,
Ray Mountains,
Sample Location,
Strategic and Critical Minerals Assessment Project,
geoscientificInformation, Fewer tags
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,...
Tags: Alaska Highway Corridor,
Analyses,
Analyses and Sampling,
Analytical Lab Results,
Analytical Results, All tags...
Bedrock,
Bedrock Geology,
Geochemical Data,
Geochemical Surveys,
Geochemistry,
Geology,
Major Oxides,
Sample Location,
Trace Elements,
Trace Geochemical,
Trace Metals,
geoscientificInformation, Fewer tags
Mineral-resources personnel from the Alaska Division of Geological & Geophysical Surveys carried out a geological field survey, including mapping and sampling northeast of Fairbanks in the Circle A-4, A-5, B-4, and B-5 quadrangles, Alaska from May 31 to June 28, 2007. The fieldwork provides basic information critical to building an understanding of Alaska geology and is part of an integrated program of airborne geophysical surveys followed by geological mapping. During 2007, 128 rock samples were collected for geochemical trace-element analysis, and 44 rock samples were collected for whole rock (major- and minor-oxide) analysis. Petrogenetically important trace-elements will be analyzed in a subsequent study to...
Tags: Alaska, State of,
Chatanika River,
Circle Quadrangle,
Crooked Creek,
Deep Creek, All tags...
Fairbanks North Star Borough,
Faith Creek,
Frozenfoot Creek,
Geochemistry,
Glacier Pup,
Harrington Fork Birch Creek,
Hope Creek,
Idaho Creek,
Major Oxides,
McManus Creek,
Montana Creek,
Polar Creek,
Pool Creek,
Ruby Creek,
Ryan, Mount,
STATEMAP Project,
Smith Creek,
Sourdough Camp,
Sourdough Creek,
Steese Highway,
Stream Sediments,
Tough Luck Creek,
Trace Metals,
geoscientificInformation, Fewer tags
This data file presents 40Ar/39Ar step-heating geochronology results for a granite sample from the Livengood mining district. The Livengood area is a historically productive placer mining area approximately 80 road miles north of Fairbanks, Alaska. This data is a component of a geologic map and accompanying report that synthesizes recently collected and previously published agency and industry geologic data in a 1:50,000-scale comprehensive geologic map to build a better understanding of the geology and mineral-resource potential of the Livengood area.
Tags: 40Ar/39Ar,
Airborne Geophysical/Geological Mineral Inventory,
Bedrock,
Bedrock Geology,
Cascaden Ridge, All tags...
Copper,
Eolian,
Fossils,
Geochemistry,
Geochronology,
Geologic Map,
Gold,
Igneous Rocks,
Livengood,
Livengood Bench,
Livengood Quadrangle,
Man-Made Deposits,
Metamorphic Rocks,
Money Knob,
Plutonic Rocks,
Ranney Hollow,
STATEMAP Project,
Sedimentary Rocks,
Shorty Creek,
Silver,
Surficial Geology,
Tailings,
Tolovana Mining District,
Tolovana River,
geoscientificInformation, Fewer tags
The Tok project area is adjacent to the Delta mineral belt volcanogenic massive-sulfide (VMS) district, the Peak gold-silver-copper skarn, and structurally controlled gold and antimony mineralization in the Stibnite Creek and White Gold areas. The project area also includes the Noah prospect, an intrusion-related copper prospect. Whereas the Delta mineral belt has been extensively mapped and explored, the detailed mapping does not continue into the 2015 Tok project area. In this area, only reconnaissance mapping has been conducted. The combination of a lack of detailed mapping, the industry interest in the adjacent areas, and the geophysical data findings prompted the Alaska Division of Geological & Geophysical...
Tags: Analyses,
Analyses and Sampling,
Analytical Lab Results,
Analytical Results,
Antimony, All tags...
Arsenic,
Bedrock Geologic Map,
Chemistry,
Geochemical Data,
Geochemical Surveys,
Geochemistry,
Gold,
Gold Prospect,
Lab Methods,
Major Oxides,
Massive Sulfide Deposit,
Massive Sulfide Occurrence,
Massive Sulfide Prospect,
Massive Sulfides,
Metallogenesis,
Metamorphic,
Metamorphic Deposit,
Metamorphic Rocks,
Metasedimentary Rocks,
Metavolcanic rocks,
Minor Oxides,
Plutonic Hosted,
Polymetallic Vein,
Porphyry,
Skarn,
Tanacross Quadrangle,
Tok,
Trace Elements,
Trace Geochemical,
Vein Deposit,
Volcanogenic Massive Sulfide,
geoscientificInformation, Fewer tags
Alaska Division of Geological & Geophysical Surveys (DGGS) personnel collected rock samples while mapping the bedrock geology along a 12-mile-wide swath following the Alaska Highway between Delta Junction and the eastern edge of the Mount Hayes quadrangle near Dot Lake, Alaska. This mapping is one component of the multi-year DGGS project studying the geology, geohazards and resources along the proposed gas pipeline corridor from Delta Junction to the Canadian border. In 2006, we collected 10 samples for whole rock (major- and minor-oxides, and petrogenetically important trace-elements) analysis. In 2007, we collected 111 samples for whole rock analysis and 36 rock samples for geochemical trace-element analysis....
Tags: Alaska Highway Corridor,
Geochemical Data,
Geochemistry,
Gold,
Lake George, All tags...
Major Oxides,
Mount Hayes Quadrangle,
STATEMAP Project,
Tanana River,
Trace Elements,
Trace Geochemical,
Trace Metals,
geoscientificInformation, Fewer tags
U-Pb analyses were performed on igneous rocks from the Ray Mountains area of west-central Alaska. These new age analyses will allow us to better evaluate the geochronology of the granitic rocks that are the apparent source of the alluvial REE and tin resources. The plutonic samples have ages ranging from 98.0 +/- 0.9 Ma to 111.6 +/- 1.0 Ma. The sample location coordinates and analytical data tables associated with this report are available in digital format as comma-separated value (CSV) files.
Tags: Age Dates,
Analyses,
Analyses and Sampling,
Analytical Lab Results,
Analytical Results, All tags...
Bedrock,
Bedrock Geology,
Bettles Quadrangle,
Geochronology,
Geology,
Igneous Rocks,
Lab Methods,
Metals,
Mineral Assessment,
Mineral Deposit,
Mineral Resources,
Minerals,
Plutonic,
Polymetallic,
Rare Earth Elements,
Ray Mountains,
Sample Location,
Strategic and Critical Minerals Assessment Project,
Tin,
U-Pb,
Zircon,
geoscientificInformation, Fewer tags
The Alaska Division of Geological & Geophysical Surveys (DGGS), in partnership with the U.S. National Cooperative Geologic Mapping Program, mapped approximately 450 mi2 of the Talkeetna Mountains region of central Alaska at 1:50,000 scale over the course of six weeks in 2014. This area contains significant exposures of Late Triassic mafic volcanics and gabbro sills that have been the focus of region-wide exploration for the Strategic and Critical platinum-group elements (PGEs). The area also exposes numerous inactive and possibly active faults which project through the area of proposed hydropower development. The resulting geologic map offers an improved understanding of the geology, structural history, and mineral...
Tags: 40Ar/39Ar,
Aerial Geology,
Aerial Photography,
Alluvial,
Alluvial Deposits, All tags...
Amphibolite Facies Units,
Bedrock Geologic Map,
Bedrock Geology,
Brachiopods,
Cleary Creek,
Colluvial Deposits,
Cordilleran Ice Sheet,
Crinoids,
Esker,
Faulting,
Faults,
Floodplain,
Fluvial,
Fossils,
Geochronology,
Geologic Map,
Geologic Materials,
Geomorphology,
Glacial,
Glacial Deposits,
Glacial Drift,
Glacial Geology,
Glacial Geomorphology,
Glacial History,
Glacial Lake,
Glacial Processes,
Glacial Stratigraphy,
Glaciation,
Ice Contact Deposits,
Ice-Contact,
Iron Creek,
Lacustrine,
Lacustrine Sedimentation,
Landslide,
Landslide Deposit,
Outwash,
Outwash Fan,
Paleochannel,
Permafrost and Periglacial,
Remote Sensing,
Rock Glaciers,
Rock-Glacier Deposits,
Rockfall,
STATEMAP Project,
Sand and Gravel,
Slides,
Slope Instability,
Soil Creep,
Stephan Lake,
Surficial,
Surficial Geologic Map,
Surficial Geology,
Talkeetna Mountains,
Talkeetna Mountains Quadrangle,
Talkeetna River,
Till,
geoscientificInformation, Fewer tags
Mineral-resources personnel from the Alaska Division of Geological & Geophysical Surveys carried out a geologic field survey, including mapping and sampling in the Moran area in the Tanana A-6 and B-6 quadrangles, and the Melozitna A-1, A2, B-1, and B-2 quadrangles, Alaska from June 17 to August 15, 2011. The fieldwork provides basic information critical to building an understanding of Alaska geology and is part of an integrated program of airborne geophysical surveys followed by geologic mapping. During 2011, 212 rock samples were collected for geochemical trace-element analysis, 58 rock samples were collected for whole-rock (major- and minor-oxide and petrogenetically important trace elements tables) analyses,...
Tags: Alaska, State of,
Geochemical Data,
Geochemistry,
Gold,
Grant Creek, All tags...
Kokrines Hills,
Little Melozitna Hot Springs,
Major Oxides,
Melozitna Mining District,
Melozitna Quadrangle,
Minor Oxides,
Moran Creek,
Moran Dome,
Platinum Group Elements,
STATEMAP Project,
Tanana Quadrangle,
Trace Elements,
Trace Geochemical,
Trace Metals,
Yukon River,
geoscientificInformation, Fewer tags
This geologic map and report depicts portions of the Livengood B-3, B-4, C-3, and C-4 quadrangles. The Livengood area is a historically productive placer mining area approximately 80 road miles north of Fairbanks, Alaska. This report synthesizes recently collected and previously published agency and industry geologic data in a 1:50,000-scale comprehensive geologic map to build a better understanding of the geology and mineral-resource potential of the Livengood area. It expands and updates the Alaska Division of Geological & Geophysical Surveys (DGGS) Preliminary Interpretive Report (PIR) 2004-3 with the addition of new DGGS mapping and drillhole data from ITH, and integrates previously published DGGS surficial...
Tags: 40Ar/39Ar,
Airborne Geophysical/Geological Mineral Inventory,
Bedrock,
Bedrock Geology,
Cascaden Ridge, All tags...
Copper,
Eolian,
Fossils,
Geochemistry,
Geochronology,
Geologic Map,
Gold,
Igneous Rocks,
Livengood,
Livengood Bench,
Livengood Quadrangle,
Man-Made Deposits,
Metamorphic Rocks,
Money Knob,
Plutonic Rocks,
Ranney Hollow,
STATEMAP Project,
Sedimentary Rocks,
Shorty Creek,
Silver,
Surficial Geology,
Tailings,
Tolovana Mining District,
Tolovana River,
geoscientificInformation, Fewer tags
40Ar/39Ar data from plutonic, dike, and alteration samples collected during geologic mapping of the eastern part of the Bonnifield mining district geologic map area in parts of Fairbanks A-1 and Fairbanks A-2 and Healy D-1 and Healy D-2 quadrangles yield results indicating the plutons, dikes, and a gold-bearing quartz vein in the Bonnifield Map area range from 85 to 95 m.y.
Tags: 40Ar/39Ar,
Age Dates,
Alaska Range,
Alaska, State of,
Buzby prospect, All tags...
Chute Creek,
Denali Borough,
Dry Creek,
Dry Creek placer mine,
Dry Creek prospect,
Fairbanks Quadrangle,
Forgotten Creek,
Geochronology,
Geology,
Glacier Creek,
Glory Creek,
Glory Creek prospect,
Healy Quadrangle,
Kansas Creek,
Kansas Creek prospect,
LEA Creek prospect,
Newman Creek,
Newman Creek placer mine,
Red Mountain Creek,
Red Mountain Creek prospect,
Rogers Creek,
STATEMAP Project,
Sheep Creek,
Slate Creek,
Slide Creek,
Smog prospect,
Snow Mountain Gulch,
Threemile Creek,
WTF (Western Tundra Flats) prospect,
West Fork Little Delta River,
Wood River,
geoscientificInformation, Fewer tags
Mineral-resources personnel from the Alaska Division of Geological & Geophysical Surveys conducted reconnaissance stream-sediment and pan-concentrate sampling in the Melozitna Mining District, Tanana and Melozitna quadrangles, from July 25 to August 13, 2011. This helicopter-supported sampling project was part of a statewide assessment of Alaska's potential for rare-earth element (REE) mineralization, and was funded by the Rare Earth Elements and Strategic Minerals Assessment capital improvement project. During this field project, 32 stream sediment and 28 heavy-mineral pan concentrate samples were collected for geochemical analysis (geochemical trace elements and rare earth elements). An additional historic U.S....
Tags: Alaska, State of,
Critical Minerals,
Geochemistry,
Gold,
Melozitna Mining District, All tags...
Melozitna Quadrangle,
Rare Earth Elements,
Strategic Minerals,
Tanana Quadrangle,
Trace Elements,
geoscientificInformation, Fewer tags
Mineral-resources personnel from the Alaska Division of Geological & Geophysical Surveys carried out a geological field survey, including mapping and sampling in the eastern part of the Bonnifield mining district in the Fairbanks A-1, A-2, Healy D-1 and D-2 quadrangles, Alaska from June 16 to July 18, 2008. The fieldwork provides basic information critical to building an understanding of Alaska geology and is part of an integrated program of airborne geophysical surveys followed by geological mapping. During 2008, 242 rock samples were collected for geochemical trace-element analysis, 106 rock samples were collected for whole rock (major- and minor-oxide and petrogenetically important trace element) analyses, and...
Tags: Alaska Range,
Alaska, State of,
Buzby prospect,
Chute Creek,
Denali Borough, All tags...
Dry Creek,
Dry Creek placer mine,
Dry Creek prospect,
Fairbanks Quadrangle,
Forgotten Creek,
Geochemistry,
Glacier Creek,
Glory Creek,
Glory Creek prospect,
Healy Quadrangle,
Kansas Creek,
Kansas Creek prospect,
LEA Creek prospect,
Major Oxides,
Newman Creek,
Newman Creek placer mine,
Red Mountain Creek,
Red Mountain Creek prospect,
Rogers Creek,
STATEMAP Project,
Sheep Creek,
Slate Creek,
Slide Creek,
Smog prospect,
Snow Mountain Gulch,
Stream Sediments,
Threemile Creek,
Trace Metals,
WTF (Western Tundra Flats) prospect,
West Fork Little Delta River,
Wood River,
geoscientificInformation, Fewer tags
This application allows users to view available geochemical data in a fully documented HTML table format. Users define the suite of sample analyses to be displayed by selecting sample and analysis types and either a geographic area or a previously compiled dataset. The data is stored in the DGGS Geologic and Earth Resource Information Library of Alaska (GERILA) digital database. The display tables are designed to provide documentation of the search criteria, samples, analyses, and individual geochemical determinations to the level reflected in their source publications or in project files to the best of DGGS staff's ability. The source GERILA dataset is incomplete and is added to as more data can be formatted and...
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