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Filters Date Range Past year (0) Past month (0) Past week (0) Past day (0) Custom range... To   Search Contacts Metadata manager State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys Benowitz, J.A. Helmold, K.P. James Weakland More... Tag Types Theme (3) Place (3) Tag Schemes Alaska Division of Geological & Geophysical Surveys (2) None (1) ISO 19115 Topic Category (3) View Results as: JSON ATOM CSV

40Ar/39Ar data, Styx River map area, Lime Hills C-1 Quadrangle, Alaska This DGGS Raw Data File presents 40Ar/39Ar age dating results for selected igneous rocks encountered in the Styx River area of the western Alaska Range. Crystallization ages on biotite and hornblende from plutonic rocks range from about ~60 to ~63 Ma, while a sericite alteration age in plutonic rocks altered by a dike swarm also is around ~63 Ma. Sericite alteration associated with a copper-molybdenum porphyry ranges from ~10 to ~11 Ma. Analyses were performed by the University of Alaska Fairbanks Geochronology Laboratory, and results were reported by Paul Layer and Jeff Benowitz. This data release includes the following products: a summary of sample collection methods, the laboratory report, analytical data tables... Tags: 40Ar/39Ar, Age Dates, Airborne Geophysical Survey, Alaska Range, Analyses and Sampling, All tags... Analytical Results, Ar-Ar, Bedrock Geology, Copper, Economic Geology, Faults, Fracturing, Geochronology, Geology, Gold, Hornblende, K-Feldspar, Lab Methods, Lime Hills Quadrangle, Mica, Mineral Deposit, Mineral Prospect, Mineralogy, Minerals, Mining, Mining Claims, Molybdenite, Muscovite, Ore Deposit Model, Plutonic Rocks, Plutons, Polymetallic Vein, Porphyry, Pyrite, Pyrrhotite, Quartz, Sample Location, Sericite, Sericite Alteration, Styx River, Volcanic Rocks, geoscientificInformation, Fewer tags Geologic map of the Circle mining district, Alaska This report provides detailed (1:63,360-scale) mapping of portions of U.S. Geological Survey Circle B-2 (1955), B-3 (1955), B-4 (1952), C-2 (1955), C-3 (1955), and C-4 (1952) quadrangles. The area is part of the Circle mining district and adjacent to the Fairbanks mining district. This report includes detailed geologic, structural, stratigraphic, and geochronologic data. Based on the resulting geologic maps, field investigations, and laboratory materials analyses, the project has also generated derivative maps of geologic construction materials and geologic hazards. Tags: Aereal, Aerial Photography, Aeromagnetic Survey, Age Dates, Alaska, State of, All tags... Alluvial Deposits, Alluvium, Amphibolite, Ar-Ar, Bedrock, Bibliography, Birch Creek, C14, Carbonates, Circle Hot Springs, Circle Mining District, Circle Quadrangle, Clastics, Coal, Colluvial Deposits, Colluvium, Conductivity Survey, Conodonts, Crooked Creek, Electromagnetic Survey, Fan, Faulting, Faults, Fluvial, Folding, Fossils, Geologic, Geomorphology, Glacial, Glacial Deposits, Glacial Drift, Granite, Hornblende, Hornfels, Igneous Rocks, K-Ar, Magnetite, Major Oxides, Mammoth Creek, Mastodon Dome, Metamorphic Grade, Metamorphic Minerals, Metamorphism, Mineralogy, Modal Analysis, Petrography, Plutonic, Plutonic Hosted, Porphyry, Precious Metals, Quartz, Regional, Regional Metamorphism, Sample Location, Sandstone, Schist, Sedimentary, Structure, Surficial, Tectonics, Terranes, geoscientificInformation, Fewer tags 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... Tags: Aleutian Arc, Beluga Basin, Bluff Point, Capps Glacier, Chert, All tags... Chuitna River, Clam Gulch, Cook Inlet, Cook Inlet Basin, Diagenesis, Falls Creek, Feldspar, Fritz Creek, Graywacke, Homer, Iniskin Bay, Iniskin Peninsula, Kachemak Bay, Kaguyak, Matanuska Valley, Mineralogy, Oil Basins, Oil and Gas, Oil and Gas Basin, Outcrop Samples, Permeability, Petrographic, Petrography, Petroleum Basin Study, Petrology, 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, Straight Creek, Tectonics, Thin Section, Tyonek, Tyonek Quadrangle, Volcanic, Volcanic Ash, Volcaniclastics, Zeolites, geoscientificInformation, Fewer tags