du Bray, Edward A.

About the author

U.S. Geological Survey, Central Region, Rocky Mountain area, Geology discipline
Jurassic, Quaternary, Tertiary, Aluminum, Antimony, Arsenic, Atomic emission spectroscopy, Barium, Bedrock geologic units, Beryllium, Bismuth, Boron, Calcium, Cerium, Cesium, Chemical analysis, Chlorine, Chromium, Coal resources, Cobalt, Copper, Datasets, Dysprosium, Economic geology, Erbium, Europium, Faulting (geologic), Fluorine, Gadolinium, Gallium, Geochemical processes, Geochemistry, Geochronology, Geographic information systems, Geologic history, Geologic maps, Geologic structure, Geospatial datasets, Geothermal resources, Gold, Hafnium, Holmium, Igneous rocks, Iron, Isotopic analysis, Laboratories, Lanthanum, Lead, Lutetium, Magnesium, Manganese, Mass spectroscopy, Mathematical simulation, Metallic mineral resources, Microscopy, Mineral deposits, Mineral resources, Mineralogy, Molybdenum, Natural resource assessment, Natural resource exploration, Neodymium, Nickel, Niobium, Particle-beam spectroscopy, Petrography, Petrology, Phosphorus, Plutonic rocks, Potassium, Potassium-argon analysis, Praseodymium, Radiometric dating, Rocks and deposits, Rubidium, Rubidium-strontium analysis, Samarium, Scandium, Silver, Sodium, Strontium, Structural geology, Sulfur, Tantalum, Terbium, Thorium, Thulium, Tin, Titanium, Tungsten, Uranium, Uranium-lead analysis, Vanadium, Volcanic activity, Volcanic rocks, X-ray fluorescence, Ytterbium, Yttrium, Zinc, Zirconium, Craters, Mine sites, Mineral deposit areas, Mountains, Alkaline basalt, Andesite, Ash-flow tuff, Basalt, Dacite, Granitoid, Granodiorite, Latite, Plutonic rock, Quartz monzonite, Rhyodacite, Rhyolite, Trachyandesite, Trachyte, Tuff, Volcanic rock, Geodatabase (ESRI), KML, Microsoft Excel format, Portable Document Format, Comma-delimited text, Shapefile

Complete analytical data for Jurassic igneous rocks in the Bald Mountain mining district, Nevada

Petrographic and geochemical analyses of 50 outcrop samples and 58 drill core samples.

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Geochemical database for igneous rocks of the ancestral Cascades Arc--southern segment, California and Nevada

Compilation of all available chemical data (more than 2,000 samples) for igneous rocks that constitute the southern segment of the ancestral Cascades magmatic arc.

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Geochemical database for the Boulder Batholith and its satellitic plutons, southwest Montana

Geochemical analyses of Cretaceous igneous intrusions in order to establish the geologic framework for world-class mineral deposits of the Butte district

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Synthesis of petrographic, geochemical, and isotopic data for the Boulder batholith, southwest Montana

Geochemical and mineralogical analyses of plutonic rock samples

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Petrographic and geochemical data for Cenozoic volcanic rocks of the Bodie Hills, California and Nevada

The purpose of this report is to present available petrographic and geochemical data for unmineralized rock samples, principally volcanic rocks and to make those data available to ongoing petrogenetic investigations of these rocks.

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Geochemical and modal data for igneous rocks associated with epithermal mineral deposits

<p>The purposes of this report are to (1) present available geochemical and modal data for igneous rocks associated with epithermal mineral deposits and (2) to make those data widely and readily available for subsequent, more in-depth consideration and in

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Geochemical and petrographic data for intrusions peripheral to the Big Timber Stock, Crazy Mountains, Montana

The Paleocene Fort Union Formation hosts a compositionally diverse array of Eocene plugs, dikes, and sills arrayed around the Eocene Big Timber stock in the Crazy Mountains of south-central Montana. The geochemistry and petrography of the sills have no

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Geochemical, modal, and geochronologic data for 1.4 Ga A-type granitoid intrusions of the conterminous United States

This report presents and makes data available to ongoing petrogenetic investigations of these rocks. It develops an accurate and current portrayal of their spatial distribution in GIS format while analyzed samples are presented via Excel workbooks.

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Geochemical characteristics of igneous rocks associated with epithermal mineral deposits—A review

<p id="sp0090">Newly synthesized data indicate that the geochemistry of igneous rocks associated with epithermal mineral deposits varies extensively and continuously from subalkaline basaltic to rhyolitic compositions. Trace element and isotopic data for

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Review of the geochemistry and metallogeny of approximately 1.4 Ga granitoid intrusions of the conterminous United States

The conterminous United States hosts numerous volumetrically significant and geographically dispersed granitoid intrusions that range in age from 1.50 to 1.32 billion years before present (Ga). Although previously referred to as A-type granites, most are

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Data to accompany U.S. Geological Survey Data Series 1099: Petrographic, geochemical and geochronologic data for Cenozoic volcanic rocks of the Tonopah, Divide, and Goldfield Mining Districts, Nevada

Geochemical, petrographic, and geochronologic data for samples, principally those of unmineralized Tertiary volcanic rocks, from the Tonopah, Divide, and Goldfield mining districts of west-central Nevada.

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Petrology of volcanic rocks associated with silver-gold (Ag-Au) epithermal deposits in the Tonopah, Divide, and Goldfield Mining Districts, Nevada

Miocene calc-alkaline volcanic rocks, part of the southern segment of the ancestral Cascades magmatic arc, are spatially, temporally, and likely genetically associated with precious metal epithermal deposits in the Tonopah, Divide, and Goldfield Districts

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Geochronology of Cenozoic rocks in the Bodie Hills, California and Nevada

Presents data for mineral deposits and unaltered and hydrothermally altered volcanic rocks. Data presented were acquired in three USGS labs by three different geochronologists. Analytical methods and data derived from each lab are presented separately.

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Geologic map of the Bodie Hills, California and Nevada

Spatial geologic map with rock type, vents, arcs, landslides, etc. provided in an ESRI geodatabase and KMZ format for Google Earth viewing. Mapsheet with accompanying descriptive pamphlet is provided as a PDF. Petrographic rock summary is also included.

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Gold-silver mining districts, alteration zones, and paleolandforms in the Miocene Bodie Hills Volcanic Field, California and Nevada

<div>The Bodie Hills is a ~40 by ~30 kilometer volcanic field that straddles the California-Nevada state boundary between Mono Lake and the East Walker River. Three precious metal mining districts and nine alteration zones are delineated in Tertiary-Quate

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Descriptive models for epithermal gold-silver deposits: Chapter Q in <Mineral deposit models for resource assessment

Epithermal gold-silver deposits are vein, stockwork, disseminated, and replacement deposits that are mined primarily for their gold and silver contents; some deposits also contain substantial resources of lead, zinc, copper, and (or) mercury. These deposi

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Geochronology and correlation of Tertiary volcanic and intrusive rocks in part of the southern Toquima Range, Nye County, Nevada

40Ar/39Ar dating, electron microprobe analyses and geologic mapping help clarify chronology and correlations of the numerous volcanic and intrusive units exposed in the area and interpret the petrogenesis of a few of the volcanic units.

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Geology and mineral resources of the Sheldon-Hart Mountain National Wildlife Refuge Complex (Oregon and Nevada), the Southeastern Oregon and North-Central Nevada, and the Southern Idaho and Northern Nevada (and Utah) Sagebrush Focal Areas

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