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View northwest toward Turquoise rapids from Tonto Trail, east side of Sapphire Canyon and above river mile 101.8. Great Unconformity at base of brown Cambrian Tapeats Sandstone cliff, overlying 1,400 feet of Paleoproterozoic granite and Vishnu Schist.
View west toward granite and gneiss, looking downriver in the Lower Granite Gorge to Travertine Canyon, river mile 228.8.
Fold in Vishnu Schist, north bank of river mile 92.0.
View northeast and upriver toward granite rocks (photographs WM01, WM02) from Tapeats Sandstone above river mile 190.8.
View northwest toward Grapevine Rapids from top of Tapeats Sandstone cliff (left edge of photograph), Tonto Trail, east side of Grapevine Creek canyon. Pegmatite dikes in Vishnu Schist on north side of river mile 82.1.
View southeast and upriver toward Serpentine Rapids from Tonto Trail, above and west of river mile 107.2, northwest of Serpentine Canyon.
View west toward Vishnu Schist in lower end of Granite Narrows from old river channel in Tapeats Sandstone, north of and above river mile 136.0.
Aerial view northwest toward metamorphic rocks with granitic dikes along the river at Granite Park (photograph WM04), river mile 208.8.
This data release contains geochemical data from selected U.S. Geological Survey (USGS) projects from the 1960s-1980s that were previously unpublished as digital data. The objective of those projects was to describe the geology, determine petrologic and geochemical characteristics, or to evaluate the mineral resource potential of Federal Lands and adjacent study areas. These data comprise geochemical analyses from 36,498 samples--27,223 rock samples, 4,091 sediment samples, 2,351 soil samples, 330 heavy-mineral pan concentrate samples, 297 organic material samples, 58 mineral samples, 27 water samples, 11 miscellaneous samples, and 2,110 unspecified media samples. More than 78 percent of these samples were analyzed...
Categories: Data;
Types: Downloadable,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
Shapefile;
Tags: "Geochemistry",
"Mineral Resources"],
Alaska,
California,
Colorado,
This U.S. Geological Survey (USGS) data release provides zircon U-Pb geochronology and whole rock isotope geochemistry for drill core samples from Montana, Nebraska, Nevada and Wyoming. The drill core samples were obtained from the USGS Core Research Center in Denver, Colorado. The samples were in order to constrain the age, provenance, metamorphic history, and geochemical character of basement terranes in the United States.
Aerial view northwest into Phantom Creek canyon with Tapeats Sandstone overlying Precambrian crystalline rocks and locally overlying red Unkar Group rocks.
Aerial view north toward thinning of Tapeats Sandstone during Cambrian deposition over small schist highland "island," northeast river bank, river mile 119.7.
View northwest and downriver toward granite at Two Hundred and Thirtyseven Mile Rapids, river mile 236.9.
River-polished gneiss and schist in Lower Granite Gorge, south bank of river mile 234.6.
Paleoproterozoic pegmatite and granite dikes in Vishnu Schist (photograph EM08), north side of river mile 82.4.
Mineral-resources personnel from the Alaska Division of Geological & Geophysical Surveys (DGGS) carried out a helicopter-supported geological and geochemical resource assessment project in the Beaver, Bettles, Livengood, and Tanana quadrangles from June 23 through August 5, 2012. The objectives of DGGS's resource assessment are to improve the trace-element geochemical coverage of selected watersheds; to obtain modern, quantitative geochemical analyses; to understand the petrogenesis of the granites; and to better document established mineral occurrences. Stream-sediment, pan-concentrate, and rock sampling were conducted as part of the State's Rare Earth Elements and Strategic Minerals Assessment project, which is...
In 2012, the State of Alaska established its Strategic and Critical Minerals (SCM) Assessment project, a State-funded Capital Improvement Project (CIP), to evaluate Alaska's statewide potential for SCM resources. The project is being implemented by the Alaska Division of Geological & Geophysical Surveys (DGGS), and involves obtaining new airborne-geophysical, geological, and geochemical data. For decades, the Ray Mountains area of west-central Alaska has been explored for its potential mineral resources. To further assess the rare-earth-element (REE) potential of the State-selected and top-filed lands in the Ray Mountains area, mineral-resource geologists at DGGS carried out a helicopter-supported geological and...
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...
Aerial view north of schist and granite in lower Separation Canyon, just north of river mile 239.8.
The geodatabase for the Charlotte 1 degree × 2 degrees quadrangle by Goldsmith and others (1988) was compiled in the Geologic Map Schema (GeMS). The geologic map extends across four lithotectonic belts of the Piedmont from the Coastal Plain and Wadesboro Triassic basin on the east to the Blue Ridge belt in the vicinity of the Grandfather Mountain window on the west. The Wadesboro Triassic basin contains arkosic sandstone, siltstone and conglomerate unconformably overlain by small inliers of late Cretaceous Coastal Plain sediment of the Middendorf Formation (?). The Blue Ridge, Inner Piedmont, Kings Mountain, Charlotte, and Carolina Slate belts consist of different Mesoproterozoic to Late Paleozoic metamorphosed...
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