Filters
Date Range
Contacts
Tag Types
Tag Schemes
|
During 2008-2010, the Alaska Division of Geological & Geophysical Surveys continued a program, begun in 2006, of reconnaissance mapping of surficial geology in the proposed natural-gas pipeline corridor through the upper Tanana River valley, a 12-mi-wide (19.3-km-wide) area that straddles the Alaska Highway through the upper Tanana River valley from the western boundaries of the Tanacross B-6 and C-6 Quadrangles near the mouth of the Robertson River eastward to the eastern boundaries of the Tanacross A-4 and B-4 Quadrangles near Tetlin Junction. Mapping during 2008-2010 in the Tanacross Quadrangle linked with mapping of surficial geology completed in the Big Delta and Mt. Hayes quadrangles in 2006-2007. Surficial...
Tags: Alaska Highway Corridor,
Alaska Range,
Alaska, State of,
Dot Lake,
Dunes, All tags...
Eolian,
Geologic Hazards,
Geologic Map,
Geologic Materials,
Geological Process,
Geology,
Geomorphology,
Glacial Deposits,
Glacier Outburst Flood,
Moraines,
Proposed Natural Gas Pipeline,
Remote Sensing,
Robertson River,
Surficial,
Surficial Geology,
Tanacross,
Tanacross Quadrangle,
Taylor Highway,
Tok,
Tok River,
Transportation Corridor,
Unconsolidated Deposits,
geoscientificInformation, Fewer tags
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...
Tags: Alaska Highway Corridor,
Alaska Pipeline,
Alaska, State of,
Digital Surface Model (DSM),
Gasline, All tags...
Geomorphology,
Lidar,
Proposed Natural Gas Pipeline,
Raster Image,
Remote Sensing,
Tanacross Quadrangle,
Trans-Alaska Pipeline,
Vegetation Digital Surface Model (DSM),
geoscientificInformation, Fewer tags
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...
Tags: Alaska Highway Corridor,
Alaska Pipeline,
Alaska, State of,
Data Normalized Digital Surface Model (nDSM),
Gasline, All tags...
Geomorphology,
Lidar,
Proposed Natural Gas Pipeline,
Raster Image,
Remote Sensing,
Tanacross Quadrangle,
Trans-Alaska Pipeline,
geoscientificInformation, Fewer tags
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...
Tags: Aerial Geology,
Alaska, State of,
Digital Elevation Model,
Digital Surface Model (DSM),
Geologic Hazards, All tags...
Geology,
Geomorphology,
Hazards,
LiDAR,
LiDAR LAS File Format,
Point Cloud Data,
Remote Sensing,
Slope Instability,
Tanacross Quadrangle,
Trans-Alaska Pipeline,
geoscientificInformation, Fewer tags
In 2005, the Alaska Division of Geological & Geophysical Surveys initiated a multi-year geologic field study focused on a corridor centered along the Alaska Highway between Delta Junction and the Canada border. The purpose of this project is to provide geologic information relevant to a proposed Alaska-Canada natural gas pipeline and other future development in the corridor. The scope of this project includes identification of active faults and characterization of seismic hazards. During the 2008 field season the active fault studies were focused on the central part of the corridor between Dot Lake and Tetlin Junction. Field studies included helicopter and fixed-wing air reconnaissance augmented by interpretation...
Tags: Active Fault,
Alaska Highway Corridor,
C14,
Dot Lake,
Earthquake, All tags...
Faulting,
Faults,
Gasline,
Geologic Hazards,
Proposed Natural Gas Pipeline,
Robertson River,
Strike-Slip,
Structural Geology,
Structure,
Tanacross,
Tanacross Quadrangle,
Taylor Highway,
Tectonics,
Tetlin,
Thrust,
Tok,
Tok River,
Transportation Corridor,
geoscientificInformation, Fewer tags
In 2016, geologists from the Alaska Division of Geological & Geophysical Surveys (DGGS) and University of Alaska Fairbanks carried out a two-part geologic mapping and geochemical sampling project in the Tok River area of the Tanacross A-5 and A-6 quadrangles (June 12-26 and July 8-26). This report provides results of stream-sediment sampling for trace-element geochemistry. An initial suite of sediment samples was collected from streams draining known gold occurrences, including the Stibnite Creek and Noah prospects, and numerous prospects in the White Gold area. These samples were split in half and the two splits were sieved to -200 mesh and -80 mesh, respectively. The splits were then both analyzed to determine...
Tags: Analyses,
Analyses and Sampling,
Analytical Lab Results,
Analytical Results,
Chemistry, All tags...
Dall Prospect,
Eagle Prospect,
Economic Geology,
Exploration,
Geochemical Data,
Geochemical Surveys,
Geochemistry,
Geology,
Gold,
Heavy Metals,
Jacqueline Prospect,
Lab Methods,
Metals,
Mineral Assessment,
Mineral Deposit,
Mineral Localities,
Mineral Prospect,
Mineral Resources,
Placer,
Placer Gold,
Precious Metals,
STATEMAP Project,
Shalosky Prospect,
Stream Sediments,
Tanacross Quadrangle,
Tok,
Tok Mining District,
Tok River,
Trace Elements,
Trace Geochemical,
Trace Metals,
geoscientificInformation, Fewer tags
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...
Tags: Alaska Highway Corridor,
Alaska Pipeline,
Alaska, State of,
Gasline,
Geomorphology, All tags...
Lidar,
Lidar LAS File Format,
Point Cloud Data,
Proposed Natural Gas Pipeline,
Remote Sensing,
Tanacross Quadrangle,
Trans-Alaska Pipeline,
geoscientificInformation, Fewer tags
Geologists from the Alaska Division of Geological & Geophysical Surveys (DGGS) and University of Alaska carried out a two-part geologic mapping and geochemical sampling project in the Tok River area of the Tanacross A-5 and A-6 quadrangles (June 12-26 and July 8-26). The Tok River area is adjacent to the Delta mineral belt volcanogenic massive-sulfide (VMS) district, the Peak gold-silver-copper skarn, and the structurally controlled gold and antimony mineralization in the Stibnite Creek and White Gold areas. The Tok River project area includes the Noah (also called Hona) prospect, an intrusion-related copper prospect. The combination of insufficient detailed geologic mapping, historical and current industry interest...
Tags: Analyses,
Analyses and Sampling,
Analytic Signal,
Analytical Lab Results,
Analytical Results, All tags...
Antimony,
Arsenic,
Bedrock,
Chemistry,
Dall Prospect,
Eagle Prospect,
Geochemical Data,
Geochemical Surveys,
Geochemistry,
Gold,
Gold Prospect,
Jacqueline Prospect,
Lab Methods,
Major Oxides,
Massive Sulfide Deposit,
Massive Sulfide Occurrence,
Massive Sulfide Prospect,
Massive Sulfides,
Metallogenesis,
Metals,
Metamorphic Rocks,
Metasedimentary Rocks,
Metavolcanic rocks,
Mineral Assessment,
Mineral Localities,
Mineral Prospect,
Minor Oxides,
Noah Prospect,
Parton Prospect,
Shalosky Prospect,
Tanacross Quadrangle,
Tok,
Tok Mining District,
Tok River,
Trace Elements,
Trace Geochemical,
Volcanogenic Massive Sulfide,
geoscientificInformation, Fewer tags
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...
Tags: Alaska Highway Corridor,
Alaska Pipeline,
Alaska, State of,
Coefficient Variation,
Gasline, All tags...
Geomorphology,
Lidar,
Proposed Natural Gas Pipeline,
Raster Image,
Remote Sensing,
Tanacross Quadrangle,
Trans-Alaska Pipeline,
geoscientificInformation, Fewer tags
40Ar/39Ar analyses of igneous rocks from the Alaska Highway corridor between Delta Junction and the Canada border show a range of Cretaceous ages from about 68 Ma to about 112 Ma. The 25 samples fall into two broad age groups. The younger group ranges from about 68 Ma to 73 Ma; the older group ranges from a minimum age of about 84 Ma to about 103 Ma. One sample, a mafic dike, yielded an older age of about 112 Ma.
Tags: 40Ar/39Ar,
Age Dates,
Alaska Highway Corridor,
Analyses and Sampling,
Analytical Lab Results, All tags...
Analytical Results,
Ar-Ar,
Bedrock,
Bedrock Geology,
Geochronology,
Geology,
Lab Methods,
Mount Hayes Quadrangle,
Nabesna Quadrangle,
Sample Location,
Tanacross Quadrangle,
geoscientificInformation, Fewer tags
The Tok electromagnetic and magnetic airborne geophysical survey data were acquired with a DIGHEMv Electromagnetic (EM) system and a CGG D1344 cesium magnetometer with a Scintrex CS3 cesium sensor. The EM and magnetic sensors were flown at a height of 30 meters (m). In addition the survey recorded data from radar and laser altimeters, a GPS navigation system, 50/60 Hz monitors and a video camera. Flights were performed with an AS-350-B3 Squirrel helicopter at a mean terrain clearance of 60 m along NE-SW (12 degrees) survey flight lines with a spacing of 400 m. Tie lines were flown perpendicular to the flight lines at intervals of approximately 4,800 m. These data were produced under contract between the State of...
Tags: Aeromagnetic,
Aeromagnetic Data,
Aeromagnetic Map,
Airborne Geophysical Survey,
Alaska, State of, All tags...
Analytic Signal,
Apparent Resistivity Contours,
Apparent Resistivity Data,
Apparent Resistivity Map,
Apparent Resistivity Survey,
Electromagnetic Anomalies,
Electromagnetic Data,
Electromagnetic Survey,
First Vertical Derivative,
Geophysical Map,
Geophysical Survey,
Geophysics,
Geophysics Search Tag,
Gridded Data,
Gulkana Quadrangle,
HEM Survey,
HFEM Survey,
Magnetic Contours,
Magnetic Data,
Magnetic Survey,
Magnetics,
Mentasta Pass,
Mount Hayes Quadrangle,
Nabesna Quadrangle,
Raster Image,
Tanacross Quadrangle,
Tok Mining District,
Tok River,
geoscientificInformation, Fewer tags
This report presents 40Ar/39Ar step-heating geochronology results for igneous and metamorphic rocks from the Alaska Division of Geological & Geophysical Surveys' (DGGS) geologic mapping project in the Tanacross A-5 and A-6 quadrangles and adjoining areas. Our results indicate the Hona granodiorite pluton intruded the area in the Late Cretaceous between 76 and 71 Ma. We determined Cretaceous metamorphic ages from 126 to 121 Ma for hornblende, biotite, sericite and muscovite from multiple samples of upper greenschist to amphibolite grade rocks. This is consistent with regional argon results that imply this area is in the upper plate of the Yukon Tanana Terrane (Hansen and Dusel-Bacon, 1998). Basaltic andesite dikes...
Tags: 40Ar/39Ar,
Amphibolite,
Analyses,
Analyses and Sampling,
Analytical Lab Results, All tags...
Analytical Results,
Basalt,
Bedrock,
Crystals,
Exploration,
Faulting,
Geochronology,
Geologic,
Geology,
Gneiss,
Granite,
Granodiorite,
Greenschist,
Hornblende,
Igneous,
Isotopes,
Metamorphic,
Metamorphic Rocks,
Metamorphism,
Methods,
Mica,
Mineral Composition,
Mineral Prospect,
Mineralogy,
Minerals,
Muscovite,
Noah Prospect,
Plagioclase,
Plutonic,
Rocks,
Sample Location,
Sericite,
Shalosky Prospect,
Tanacross Quadrangle,
Tok,
Tok Mining District,
Tok River,
geoscientificInformation, Fewer tags
During 2008 the Alaska Division of Geological & Geophysical Surveys (DGGS) conducted reconnaissance interpretive mapping of permafrost in Alaska Highway Corridor Segment 2, a 12-mi-wide (19.3-km-wide) corridor that straddles the Alaska Highway through the upper Tanana River valley from the eastern boundary of the Mt. Hayes Quadrangle to the eastern edge of the Tanacross Quadrangle. This work was an extension of permafrost mapping done in Alaska Highway Corridor Segment 1 from Delta Junction to Dot Lake in the Big Delta and Mt. Hayes Quadrangles during 2006-2007. Primarily, we inferred the extent of permafrost and ice content by interpreting ~1:65,000-scale, false-color infrared aerial photographs taken in July 1978,...
Tags: Alaska Highway Corridor,
Alaska Range,
Alaska, State of,
Climate Change,
Dot Lake, All tags...
Engineering Geology,
Gasline,
Geologic Hazards,
Geologic Map,
Geological Process,
Geology,
Ice,
Permafrost,
Pingos,
Proposed Natural Gas Pipeline,
Remote Sensing,
Robertson River,
Subsidence,
Tanacross,
Tanacross Quadrangle,
Taylor Highway,
Thaw Lakes,
Tok,
Tok River,
Transportation Corridor,
geoscientificInformation, Fewer tags
During 2009, the Alaska Division of Geological & Geophysical Surveys continued a program, begun in 2006, of reconnaissance mapping of surficial geology in the proposed natural-gas pipeline corridor through the upper Tanana River valley. The study area is a 12-mi-wide (19.3-km-wide) area that straddles the Alaska Highway from the western boundaries of the Tanacross B-3 and A-3 quadrangles near Tetlin Junction eastward to the eastern boundaries of the Nabesna D-1 and C-1 quadrangles along the Canada border. Mapping during 2008-2009 in the Tanacross and Nabesna quadrangles linked with the mapping completed in the Tanacross, Big Delta and Mt. Hayes quadrangles in 2006-2008. Surficial geology was initially mapped in...
Tags: Alaska Highway Corridor,
Alaska Range,
Alaska, State of,
Beaver Creek,
Canada, All tags...
Chisana River,
Dunes,
Eolian,
Geologic Hazards,
Geologic Map,
Geologic Materials,
Geological Process,
Geology,
Geomorphology,
Midway Lake,
Nabesna,
Nabesna Quadrangle,
Nabesna River,
Northway,
Northway Junction,
Proposed Natural Gas Pipeline,
Remote Sensing,
Scottie Creek,
Surficial,
Surficial Geology,
Tanacross,
Tanacross Quadrangle,
Tanana River,
Tetlin Junction,
Tetlin National Wildlife Refuge,
Transportation Corridor,
Unconsolidated Deposits,
geoscientificInformation, Fewer tags
|
|