Major-oxide, minor-oxide, and trace-element geochemical data from rocks and stream sediments in the Wrangellia mineral assessment area, Gulkana, Healy, Mount Hayes, and Talkeetna Mountains quadrangles, Alaska

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

Feature dataset GeologicMap, part of Geologic Map of Northeasternmost Tennessee, and Adjacent Parts of Virginia and North Carolina

The geology of an area of 660 square miles mostly in the northeastern corner of Tennessee and small adjacent areas in Virginia and North Carolina is the subject of this report. The region lies principally in the Unaka province, with extensions northwestward into the Appalachian Valley and southwestward into the Blue Ridge province. The report combines results of surveys made between 1941 and 1953 by the U. S. Geological Survey, the Tennessee Division of Geology, and the Tennessee Valley Authority, and is published in cooperation with the Tennessee Division of Geology. Northeasternmost Tennessee is a region of widespread mineralization and was formerly important for mineral production. Iron, manganese, and bauxite...

Tags: Abingdon, Alluvium, Andesite, Argillite, Arkose, All tags... Austinville, Baldwin Gap, Blue Ridge, Bluff City, Bristol, Cambrian, Carbonate rock, Carter, Cenozoic, Chert, Conglomerate, Conococheague Limestone, Damascus, Doe, Dolostone, Economic Geology, Elbrook Dolomite, Elizabethton, Elk Mills, Elk Park, Erwin, Erwin Formation, Flaser gneiss, Gneiss, Granite, Granodiorite, Gravel, Grayson, Graywacke, Greenstone, Hampton, Hampton Formation, Holston Valley, Honaker Dolomite, Iron Mountain Gap, Iron Mountains, Jonesboro Limestone, Keenburg, Konnarock, Latite, Laurel Bloomery, Lenoir Limestone, Limestone, Lucy Creek, Lynn Mountain, Migmatite, Mill Creek, Mount Rogers volcanic group, Mountain City, Mylonite, Nolichucky Shale, North Carolina, Ordovician, Paleozoic, Phyllite, Phyllonite, Precambrian, Quartz monzonite, Quartzite, Quaternary, Rhyolite, Rome Formation, Sandstone, Schist, Shady Dolomite, Shady Valley, Shale, Sherwood, Siltstone, Slate, South Holston Lake, Stone Mountain, Stratigraphy, Structural Geology, Talus, Tennessee, Tertiary, Tuff, USGS Science Data Catalog (SDC), Unicoi Formation, Valley Forge, Virginia, Watauga, White Rocks Mountain, Zionville, iron, manganese, metamorphic rocks, metamorphism (geological), plutonic rocks, sedimentary rocks, unconsolidated deposits, volcanic rocks, zinc, Fewer tags

40Ar/39Ar data from rocks collected in the 2015 Wrangellia mineral assessment project area, Mount Hayes A-5, Mount Hayes B-6, and Talkeetna Mountains D-2 quadrangles, Alaska

This report presents 40Ar/39Ar step-heating geochronology results for igneous and metamorphic rocks from the Alaska Division of Geological & Geophysical Surveys' (DGGS) Wrangellia Mineral Assessment project, part of a multi-year effort focusing on improving the publicly available geoscientific information for the western Wrangellia terrane. The samples described in this report were selected and analyzed to improve our understanding of the geology and structural history of the Wrangellia Mineral Assessment project area. A metagabbro rock sample returned a Late Triassic crystallization age consistent with regional ages for Nikolai Greenstone-related magmatism; however, the two amphibole separates ages do not overlap,...

Tags: 40Ar/39Ar, Analyses, Analyses and Sampling, Analytical Lab Results, Analytical Results, All tags... Ar-Ar, Basalt, Bedrock, Bedrock Geology, Copper, Crystals, Geochronology, Geologic, Geology, Greenstone, Hayes, Hornblende, Igneous, Igneous Rocks, Interpretation, Lab Methods, Methods, Mica, Mineral Composition, Mineral Resources, Mineralogy, Minerals, Mount Hayes Quadrangle, Muscovite, Plutonic Rocks, Porphyry, Resources, Rocks, Sample Location, Strategic Minerals, Strategic and Critical Minerals Assessment Project, Stratigraphy, Structural Geology, Talkeetna, Talkeetna Mountains, Talkeetna Mountains Quadrangle, Thrust, Volcanic Rocks, geoscientificInformation, Fewer tags

Lime Creek Valley. Copper River region, Alaska. 1901.

Album caption: Lime Creek Valley, a strike valley along the contact between greenstone and limestone. Copper River, Alaska. No index card available. Notes: Published as plate XV-A in U.S. Geological Survey Professional paper 41. 1903.

Categories: Image; Tags: Copper River region, Alaska, Greenstone, Limestone, photo print

Database for the Preliminary Geologic Map of the Cherry Hill Quadrangle, Dinwiddie, Sussex, and Greensville Counties, Virginia

The database for the Preliminary Geologic Map of the Cherry Hill Quadrangle, Dinwiddie, Sussex, and Greensville Counties, Virginia geographically straddles the Coastal Plain and Piedmont Provinces along the Tidewater Fall Line. Rocks of the eastern Piedmont Roanoke Rapids terrane crop out in the western part of the quadrangle and consist of greenschist- to amphibolite-facies Neoproterozoic felsic to intermediate metavolcanic rocks, some of which contain flattened quartz phenocrysts and are locally isoclinally folded; greenstone that is locally primary layered; and intrusive metadiorite and metagabbro, much of which has been altered to amphibolite. Most of these rocks are strongly foliated and jointed. Greenschist-facies...

Tags: Alluvial terrace, Alluvium, Amphibolite, Aplite, Atlantic coastal plain, All tags... Bacons Castle Formation, Black Branch, Cambrian, Cataclasite, Cherry Hill, Chesapeake Group, Clastic rock, Clay or mud, Coarse-grained mixed clastic rock, Colluvium, De Witt pluton, Devonian, Dinwiddie County, Dinwiddie terrane, Double Branch Creek, Economic Geology, Felsic metavolcanic rock, Gabbroid, Geochemistry, Geomorphology, Granite, Granitoid, Gravel, Greenstone, Greenville County, Hardwood Creek, Harris Swamp, Holocene, Horsepen Branch, Intermediate metavolcanic rock, Lake or marine sediment, Landslide, Manlove Branch, Mayes Pond, Mesozoic, Metamorphic rock, Metasedimentary rock, Metavolcanic rock, Mica schist, Millrun Branch, Mineral Resources, Miocene, Mixed volcanic/clastic rock, Mylonite, Neogene, Neoproterozoic, Nottoway River, Nottoway River fault zone, Open-File Report, Paleozoic, Pegmatite, Pennsylvanian, Pleistocene, Pliocene, Plutonic rock, Quartzite, Quaternary, Rita Branch, Roanoke Rapids terrane, Rocky Branch, Sand, Sandstone, Sappony Creek, Schist, Sedimentology, Silurian, Smith Branch, Spring Meadow Branch, Stewart Branch, Stratigraphy, Structural Geology, Sussex County, Terrace, USGS Science Data Catalog (SDC), Unconsolidated material, Virginia, bedrock geologic units, building stone resources, deformation (geologic), earth characteristics, earth sciences, environment, fault zones, faulting (geologic), faults, foliation (geologic), fracture (geologic), gabbro, geochemistry, geologic contacts, geologic history, geologic maps, geologic structure, geology, geoscientificInformation, geospatial datasets, gravel deposits, igneous rocks, lineation (geologic), lithostratigraphy, maps and atlases, metallic mineral resources, metamorphic rocks, metamorphism (geological), mine sites, mineral resources, natural resources, natural rock formations, petrology, plutonic rocks, rocks and deposits, sand deposits, sedimentary rocks, sedimentology, silt, stratigraphy, structural geology, study areas, surficial geologic units, unconsolidated deposits, volcanic rocks, Fewer tags

Major-oxide and trace-element geochemical data from rocks collected in 2014 in the Wrangellia mineral assessment area, Talkeetna Mountains C-4, C-3, and B-4 quadrangles, Alaska

The mineral-resources group from the Alaska Division of Geological & Geophysical Surveys (DGGS) carried out a geologic mapping project in the Talkeetna Mountains C-4, C-3, and B-4 quadrangles from July 23 through August 3, 2014. This project is a part of a multi-year project focusing on improving the publicly-available geological and geochemical data and assessing the mineral potential of the less-explored extension of the western Wrangellia terrane. This program of geologic mapping and rock sampling was conducted as part of the U.S. Geological Survey National Cooperative Geologic Mapping Program and the state of Alaska's Strategic Minerals Assessment project, an initiative designed to evaluate Alaska's potential...

Tags: Copper, Geochemical Data, Geochemical Surveys, Gold, Greenstone, All tags... Iron Creek, Major Oxides, Mineral Assessment, Platinum Group Elements, Rare Earth Elements, STATEMAP Project, Silver, Stephan Lake, Strategic and Critical Minerals Assessment Project, Talkeetna Mountains, Talkeetna Mountains Quadrangle, Talkeetna River, Trace Elements, Tsisi Creek, geoscientificInformation, Fewer tags

Major-oxide and trace-element geochemical data from rocks collected in 2015 in the Wrangellia mineral assessment area, Alaska

Late Triassic mafic to ultramafic intrusions in the Wrangellia terrane are host to magmatic sulfide nickel-copper-cobalt and platinum-group element (PGE) mineralization. DGGS's mineral-resources group carried out a geologic mapping project in the eastern Denali Highway region between Watana Creek and Paxson from July 29 through August 7, 2015. This project is part of a multi-year effort focusing on improving the publicly available geological and geochemical data and assessing the mineral potential of the less-explored extension of the western Wrangellia terrane; other data resulting from this project include geophysical surveys and several geochemical datasets. This program of geologic mapping and rock sampling...

Tags: Analyses, Analyses and Sampling, Analytical Lab Results, Analytical Results, Basalt, All tags... Bedrock Geologic Map, Cobalt, Copper, Critical Minerals, Geochemical Data, Geochemical Surveys, Geochemistry, Greenstone, Lab Methods, Major Oxides, Minor Oxides, Mount Hayes Quadrangle, Nickel, Palladium, Platinum Group Elements, Sample Location, Silver, Strategic Minerals, Strategic and Critical Minerals Assessment Project, Sulfur, Talkeetna Mountains Quadrangle, Trace Geochemical, Ultramafic, geoscientificInformation, Fewer tags