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This data file presents 40Ar/39Ar step-heating geochronology results for a granite sample from the Livengood mining district. The Livengood area is a historically productive placer mining area approximately 80 road miles north of Fairbanks, Alaska. This data is a component of a geologic map and accompanying report that synthesizes recently collected and previously published agency and industry geologic data in a 1:50,000-scale comprehensive geologic map to build a better understanding of the geology and mineral-resource potential of the Livengood area.
Aerial view north into Clear Creek canyon, about 1 mile north of river mile 84.7. View of vertical beds of Paleoproterozoic Vishnu Schist overlain by horizontal Cambrian Tapeats Sandstone (brown cliff) in foreground, and tilted Mesoproterozoic Bass Formation in distance, that marks the Great Unconformity.
View west and downriver toward lower part of Paleoproterozoic Zoroaster Granite “island” with pegmatite and granite intrusions into black Vishnu Schist on south side of river mile 85.7. Tapeats Sandstone at skyline.
Aerial view west toward Bright Angel Creek delta (lower right center of photograph) and two Colorado River foot bridges to Phantom Ranch in Bright Angel Creek from over river mile 88.0. Upper black Kaibab Suspension Bridge is for mules and people crossing, lower gray Silver Bridge is for people and water pipeline crossing. Bass Formation (cliffs) and overlying red slope of Hakatai Shale (photograph EM17) at left overlies Precambrian metamorphic rocks.
View south and downriver toward Diamond Peak (Redwall Limestone peak); schist and granite below Tapeats Sandstone cliff and Bright Angel Shale slope on west side of river mile 221.6.
View west and downriver toward granite and gneiss in Lower Granite Gorge near Two Hundred and Thirtyfour Mile canyon, river mile 233.5.
View downriver and northwest toward beginning of Granite Narrows, with metamorphic rocks and granitic intrusions, lower left of photograph (photograph CM10). River mile 135.5.
View west and downriver toward Paleoproterozoic Vishnu Schist metamorphic complex from river mile 78.4. Greatest Angular Unconformity is between schist and overlying east-dipping strata of Mesoproterozoic Bass Formation. White talus of Hance asbestos mine at Cardenas Basalt sill within Bass Formation, upper right of photograph.
View west and downriver toward Paleoproterozoic schist and granite near Vishnu Creek, from river mile 81.8.
This geologic database is a digitized version of the original 1:24,000-scale analog geologic map titled "Geologic map of the Vidal, California, and Parker SW, California-Arizona quadrangles", published by the U.S. Geological Survey (USGS) in 1980. The map area straddles the Arizona-California border, and is located approximately 9.0 km (5.6 mi) west-southwest of Parker, CA, immediately south of the unincorporated communities of Vidal and Vidal Junction, CA. The map area includes the northern Riverside Mountains, which contain a prominent suite of Permian, Mesozoic, and potentially Precambrian metamorphic and metasedimentary rocks. These rocks predominantly consist of gneisses, schists, limestones, and dolomites,...
This U.S. Geological Survey (USGS) data release includes whole rock geochemical and isotopic data, and uranium-lead isotopic data collected by both Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) and Sensitive High Resolution Ion Microprobe-Reverse Geometry (SHRIMP-RG) methods for rocks in Colorado, Wyoming, Utah, and New Mexico.
Categories: Data;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Colorado,
Geochemistry,
National Cooperative Mapping Program,
New Mexico,
USGS Science Data Catalog (SDC),
The Tok project area is adjacent to the Delta mineral belt volcanogenic massive-sulfide (VMS) district, the Peak gold-silver-copper skarn, and structurally controlled gold and antimony mineralization in the Stibnite Creek and White Gold areas. The project area also includes the Noah prospect, an intrusion-related copper prospect. Whereas the Delta mineral belt has been extensively mapped and explored, the detailed mapping does not continue into the 2015 Tok project area. In this area, only reconnaissance mapping has been conducted. The combination of a lack of detailed mapping, the industry interest in the adjacent areas, and the geophysical data findings prompted the Alaska Division of Geological & Geophysical...
View downriver from Crystal Creek delta toward pegmatite dikes in Vishnu Schist on north side of river below Crystal Rapids, from river mile 98.7.
View south and downriver toward Diamond Peak (Redwall Limestone peak) and gneiss and granite on west side of river mile 222.4.
View southeast toward Serpentine Rapids from Tonto Trail, northwest of Serpentine Canyon delta, a quarter mile above river mile 106.7. Vishnu Schist with a few white pegmatite intrusions.
View downriver toward Two Hundred and Twelve Mile rapid showing black schist of Precambrian schist "island” (photographs WM06, WM07, WM08) at river mile 212.5.
View southwest and downriver toward granite and schist just upriver of Spencer Canyon, Lower Granite Gorge, river mile 245.8. Remnant of basalt flow from Toroweap area on right side of river opposite Spencer Canyon.
View downriver toward Bedrock Rapids and granite bedrock intrusion into metamorphic rocks just upstream of rapid, river mile 131.1.
Vishnu Schist, south bank of river mile 78.8.
View west and downriver from river mile 85.5 toward core of Precambrian Zoroaster Granite “island.” Tapeats Sandstone cliff at skyline.
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