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A physiographically prominent, approximately 40 square km plateau lies roughly 20 km east of Mount Spurr volcano, northwestern Cook Inlet region, Alaska, and comprises the preserved remnant of a volcaniclastic succession, designated in this study as map unit Qvc. Although this readily mappable package of volcaniclastic rocks has been recognized in numerous studies during the past five decades, uncertainties regarding its age and origin have persisted. We describe the general characteristics of the volcaniclastic plateau, provide new age constraints for deposits, present lithofacies descriptions and interpretations of the volcaniclastic strata, and synthesize our observations and lithofacies analysis to propose an...
Tags: Age Dates,
Alluvial,
Alluvial Deposits,
Bedrock,
Bedrock Geology, All tags...
Capps Glacier,
Debris Flow,
Debris Flow Deposit,
Depositional Environment,
Depositional Environments,
Detrital Zircon,
Facies Analysis,
Geochronology,
Geological Process,
Geology,
Lahar,
Lahar Runout Flow,
Liquefaction,
Mount Spurr,
Paleoenvironment,
Paleogeography,
STATEMAP Project,
Sediment Transport,
Sedimentary,
Sedimentary Rocks,
Sedimentation,
Sedimentology,
Tyonek Quadrangle,
U-Pb,
Volcaniclastics,
geoscientificInformation, Fewer tags
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This data release presents zircon U-Pb LA-ICP-MS geochronology from igneous rocks exposed in a coastal exposure at Ursus Head, Iliamna C-2 Quadrangle. Sills and dikes exposed in a coastal exposure at Ursus Head are deformed within the Bruin Bay fault zone. Common dikes intruding late Triassic Kamishak Formation strata composing the hanging-wall of the Bruin Bay fault are cut by numerous small-scale, low-angle, bedding-parallel, and high angle contractional faults. Sample 09MAW006A collected from one of many dikes deformed in the fault zone produced a uni-modal distribution of zircon ages of with a weighted mean of 206.92 +/-0.96 (2 sigma, n=47) and an MSWD of 1.1. Sample 09BG020C collected from a sill of more mafic...
Tags: 40Ar/39Ar,
Age Dates,
Analyses,
Analyses and Sampling,
Analytical Lab Results, All tags...
Analytical Results,
Ar-Ar,
Bedrock,
Bedrock Geology,
Contact Point,
Cook Inlet,
Cook Inlet Basin,
Fault Displacement,
Geochronology,
Geologic,
Geology,
Igneous,
Iliamna Quadrangle,
Isotopes,
Lab Methods,
Lead,
Methods,
Naknek,
Plagioclase,
Rocks,
Sample Location,
Stratigraphy,
Structural Geology,
Structure,
Tectonics,
U-Pb,
Uranium,
Ursus Head,
Volcanic,
Volcanic Rocks,
Zircon,
geoscientificInformation, Fewer tags
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The Alaska Division of Geological & Geophysical Surveys, in collaboration with the University of Alaska Fairbanks, collected mafic rocks in the Ivishak River area of the northeastern Brooks Range during summer 2009 for geochemical sampling. The sampled rocks, including lava flows, sills, and limy volcaniclastic strata, crop out within the carbonate-platform succession of the Carboniferous Lisburne Group. Refer to Herriott and others (2011) for additional information regarding the geologic and geographic context of these samples, preliminary implications of the geochemical data presented here, and a summary of known mafic rock occurrences in the Arctic Alaska terrane. The analytical data tables associated with this...
Tags: Analyses and Sampling,
Brooks Range,
Geochemical Data,
Geochemistry,
Igneous, All tags...
Igneous Rocks,
Ivishak River,
Major Oxides,
Sagavanirktok Quadrangle,
Trace Elements,
geoscientificInformation, Fewer tags
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The 1:63,360 Kavik River geologic map area consists of ~620 square miles and ties together previous DGGS mapping in the Sadlerochit and Shublik Mountains area of the western Arctic National Wildlife Refuge (ANWR) on the east and the structurally complex foothills and mountain front near the Kemik gas accumulation on the west. The map area exposes a unique intersection of North Slope stratigraphy where all three major depositional megasequences are mappable in close association (Ellesmerian, Beaufortian, and Brookian).
Tags: Arctic National Wildlife Refuge,
Canning River,
Fin Creek,
Geologic,
Geologic Map, All tags...
Geology,
Juniper Creek,
Kavik River,
Mount Michelson Quadrangle,
North Slope,
North Slope Basin,
Oil and Gas Basin,
Rock Units,
STATEMAP Project,
Sedimentary,
Sedimentary Rocks,
Sedimentation,
Sedimentology,
Seismic Profile,
Structural Geology,
Structure,
Structure Map,
geoscientificInformation, Fewer tags
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This geologic map and report present 1:63,360-scale geologic mapping of the south-central Sagavanirktok Quadrangle in northern Alaska. This area encompasses approximately 600 square miles in the northern foothills of the Brooks Range, and includes stratigraphic and structural elements important to understanding the oil and gas potential of Alaska's North Slope.
Tags: Alaska Pipeline,
Apatite,
Arctic Alaska,
Arctic National Wildlife Refuge,
Aufeis State #1, All tags...
Brookian,
Brooks Range,
Colville Basin,
Cross Section,
Dalton Highway,
Echooka River,
Energy Resources,
Exhumation,
Fission Track,
Geologic Map,
Happy Valley,
Hydrocarbon,
Icecut,
Inoceramus,
Ivishak River,
Lupine River,
Lupine State #1,
Lupinvanirktok,
North Slope,
Oil Seeps,
Oil and Gas Basin,
Petroleum,
Philip Smith Mountains,
Planolites,
Regression,
STATEMAP Project,
Sagashak Creek,
Sagavanirktok Quadrangle,
Sagavanirktok River,
Sagwon Bluffs,
Sedimentary Rocks,
Seismic Interpretation,
Sequence Stratigraphy,
Susie State #1,
Thermal History,
Thermal Maturity,
Thermochronology,
Trace Fossils,
Trans-Alaska Pipeline,
Transgression,
Uplift,
Well Logs,
geoscientificInformation, Fewer tags
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