Edward A du Bray (Former Employee)
Science and Products
Filter Total Items: 16
Filter Total Items: 99
Episodic intrusion, internal differentiation, and hydrothermal alteration of the Miocene Tatoosh intrusive suite south of Mount Rainier, Washington
The Miocene Tatoosh intrusive suite south of Mount Rainier is composed of three broadly granodioritic plutons that are manifestations of ancestral Cascades arc magmatism. Tatoosh intrusive suite plutons have individually diagnostic characteristics, including texture, mineralogy, and geochemistry, and apparently lack internal contacts. New ion-microprobe U-Pb zircon ages indicate crystallization of
Authors
Edward A. du Bray, Charles R. Bacon, David John, Joseph L. Wooden, Frank K. Mazdab
Petrology and hydrothermal alteration of Jurassic intrusive rocks associated with gold deposits in the Bald Mountain mining district, White Pine County, Nevada
No abstract available.
Authors
Edward A. du Bray, J. Thomas Nash, Gregory P. Meeker, David Adams, William A. Wright
Complete Analytical Data for Samples of Jurassic Igneous Rocks in the Bald Mountain Mining District, Nevada
This report presents all petrographic, major oxide, and trace element data for a set of 109 samples collected during an investigation of Jurassic igneous rocks in the Bald Mountain mining district, Nevada. Igneous rocks in the district include the Bald Mountain stock, quartz-feldspar porphyry dikes, basaltic andesite dikes, aplite sills, and rare lamprophyre dikes. These rocks, although variably a
Authors
Edward A. du Bray
Geochemical database for the Boulder batholith and its satellitic plutons, Southwest Montana
Geochemical data presented in this report pertain to Cretaceous igneous intrusions of the Boulder batholith and its satellitic plutons in southwest Montana. The geographic area addressed in this compilation is approximately bounded by lats 45.6 deg and 46.7 deg N. and longs 112.75 deg and 111.5 deg W. These data were compiled in order to establish the geologic framework for world-class mineral dep
Authors
Edward A. du Bray, Karen Lund, Robert I. Tilling, Paul Denning, Ed DeWitt
Geochemical database for igneous rocks of the ancestral Cascades Arc— Southern segment, California and Nevada
Volcanic rocks that form the southern segment of the Cascades magmatic arc are an important manifestation of Cenozoic subduction and associated magmatism in western North America. Until recently, these rocks had been little studied and no systematic compilation of existing composition data had been assembled. This report is a compilation of all available chemical data for igneous rocks that consti
Authors
Edward A. du Bray, David John, Keith Putirka, Brian L. Cousens
Compilation of Stratigraphic Thicknesses for Caldera-Related Tertiary Volcanic Rocks, East-Central Nevada and West-Central Utah
The U.S. Geological Survey (USGS), the Desert Research Institute (DRI), and a designee from the State of Utah are currently conducting a water-resources study of aquifers in White Pine County, Nevada, and adjacent areas in Nevada and Utah, in response to concerns about water availability and limited geohydrologic information relevant to ground-water flow in the region. Production of ground water i
Authors
D. S. Sweetkind, E. A. Du Bray
Modal Composition and Age of Intrusions in North-Central and Northeast Nevada
Introduction
Data presented in this report characterize igneous intrusions of north-central and northeast Nevada and were compiled as part of the Metallogeny of the Great Basin project conducted by the U.S. Geological Survey (USGS) between 2001 and 2007. The compilation pertains to the area bounded by lats 38.5 and 42 N., long 118.5 W., and the Nevada-Utah border (fig. 1). The area contains num
Authors
Edward A. du Bray, A. Elizabeth Jones Crafford
Geochemical Database for Intrusive Rocks of North-Central and Northeast Nevada
North-central and northeast Nevada contains numerous large plutons and smaller stocks but also contains many small, shallowly emplaced intrusive bodies, including dikes, sills, and intrusive lava dome complexes. Decades of geologic investigations in the study area demonstrate that many ore deposits, representing diverse ore deposit types, are spatially, and probably temporally and genetically, ass
Authors
Edward A. du Bray, Michael W. Ressel, Calvin G. Barnes
Petrology of the Crazy Mountains dike swarm and geochronology of associated sills, south-central Montana
No abstract available.
Authors
Edward A. du Bray, Stephen S. Harlan, Anna B. Wilson
Geochemical database for volcanic rocks of the western Cascades, Washington, Oregon, and California
No abstract available.
Authors
Edward A. du Bray, David John, David R. Sherrod, Russell C. Evarts, Richard M. Conrey, Jaroslav Lexa
Geochemistry and Geochronology of Middle Tertiary Volcanic Rocks of the Central Chiricahua Mountains, Southeast Arizona
Middle Tertiary volcanic rocks of the central Chiricahua Mountains in southeast Arizona are the westernmost constituents of the Eocene-Oligocene Boot Heel volcanic field of southwestern New Mexico and southeastern Arizona. About two dozen volumetric ally and stratigraphically significant volcanic units are present in this area. These include large-volume, regionally distributed ash-flow tuffs and
Authors
Edward A. du Bray, John S. Pallister, Lawrence W. Snee
Composition, age, and petrogenesis of Late Cretaceous intrusive rocks in the central Big Belt Mountains, Broadwater and Meagher counties, Montana
Cretaceous intrusions hosted by the Proterozoic Newland Formation. The northern intrusion, centered on Boulder Baldy, consists of outer, intermediate, and core zones composed of aegirine-augite quartz monzonite, hornblende quartz monzodiorite, and biotite granodiorite, respectively. The southern intrusion, north of Mount Edith, is compositionally indistinguishable from the intermediate zone of the
Authors
E. A. Du Bray, L. W. Snee
Science and Products
Filter Total Items: 16
Filter Total Items: 99
Episodic intrusion, internal differentiation, and hydrothermal alteration of the Miocene Tatoosh intrusive suite south of Mount Rainier, Washington
The Miocene Tatoosh intrusive suite south of Mount Rainier is composed of three broadly granodioritic plutons that are manifestations of ancestral Cascades arc magmatism. Tatoosh intrusive suite plutons have individually diagnostic characteristics, including texture, mineralogy, and geochemistry, and apparently lack internal contacts. New ion-microprobe U-Pb zircon ages indicate crystallization of
Authors
Edward A. du Bray, Charles R. Bacon, David John, Joseph L. Wooden, Frank K. Mazdab
Petrology and hydrothermal alteration of Jurassic intrusive rocks associated with gold deposits in the Bald Mountain mining district, White Pine County, Nevada
No abstract available.
Authors
Edward A. du Bray, J. Thomas Nash, Gregory P. Meeker, David Adams, William A. Wright
Complete Analytical Data for Samples of Jurassic Igneous Rocks in the Bald Mountain Mining District, Nevada
This report presents all petrographic, major oxide, and trace element data for a set of 109 samples collected during an investigation of Jurassic igneous rocks in the Bald Mountain mining district, Nevada. Igneous rocks in the district include the Bald Mountain stock, quartz-feldspar porphyry dikes, basaltic andesite dikes, aplite sills, and rare lamprophyre dikes. These rocks, although variably a
Authors
Edward A. du Bray
Geochemical database for the Boulder batholith and its satellitic plutons, Southwest Montana
Geochemical data presented in this report pertain to Cretaceous igneous intrusions of the Boulder batholith and its satellitic plutons in southwest Montana. The geographic area addressed in this compilation is approximately bounded by lats 45.6 deg and 46.7 deg N. and longs 112.75 deg and 111.5 deg W. These data were compiled in order to establish the geologic framework for world-class mineral dep
Authors
Edward A. du Bray, Karen Lund, Robert I. Tilling, Paul Denning, Ed DeWitt
Geochemical database for igneous rocks of the ancestral Cascades Arc— Southern segment, California and Nevada
Volcanic rocks that form the southern segment of the Cascades magmatic arc are an important manifestation of Cenozoic subduction and associated magmatism in western North America. Until recently, these rocks had been little studied and no systematic compilation of existing composition data had been assembled. This report is a compilation of all available chemical data for igneous rocks that consti
Authors
Edward A. du Bray, David John, Keith Putirka, Brian L. Cousens
Compilation of Stratigraphic Thicknesses for Caldera-Related Tertiary Volcanic Rocks, East-Central Nevada and West-Central Utah
The U.S. Geological Survey (USGS), the Desert Research Institute (DRI), and a designee from the State of Utah are currently conducting a water-resources study of aquifers in White Pine County, Nevada, and adjacent areas in Nevada and Utah, in response to concerns about water availability and limited geohydrologic information relevant to ground-water flow in the region. Production of ground water i
Authors
D. S. Sweetkind, E. A. Du Bray
Modal Composition and Age of Intrusions in North-Central and Northeast Nevada
Introduction
Data presented in this report characterize igneous intrusions of north-central and northeast Nevada and were compiled as part of the Metallogeny of the Great Basin project conducted by the U.S. Geological Survey (USGS) between 2001 and 2007. The compilation pertains to the area bounded by lats 38.5 and 42 N., long 118.5 W., and the Nevada-Utah border (fig. 1). The area contains num
Authors
Edward A. du Bray, A. Elizabeth Jones Crafford
Geochemical Database for Intrusive Rocks of North-Central and Northeast Nevada
North-central and northeast Nevada contains numerous large plutons and smaller stocks but also contains many small, shallowly emplaced intrusive bodies, including dikes, sills, and intrusive lava dome complexes. Decades of geologic investigations in the study area demonstrate that many ore deposits, representing diverse ore deposit types, are spatially, and probably temporally and genetically, ass
Authors
Edward A. du Bray, Michael W. Ressel, Calvin G. Barnes
Petrology of the Crazy Mountains dike swarm and geochronology of associated sills, south-central Montana
No abstract available.
Authors
Edward A. du Bray, Stephen S. Harlan, Anna B. Wilson
Geochemical database for volcanic rocks of the western Cascades, Washington, Oregon, and California
No abstract available.
Authors
Edward A. du Bray, David John, David R. Sherrod, Russell C. Evarts, Richard M. Conrey, Jaroslav Lexa
Geochemistry and Geochronology of Middle Tertiary Volcanic Rocks of the Central Chiricahua Mountains, Southeast Arizona
Middle Tertiary volcanic rocks of the central Chiricahua Mountains in southeast Arizona are the westernmost constituents of the Eocene-Oligocene Boot Heel volcanic field of southwestern New Mexico and southeastern Arizona. About two dozen volumetric ally and stratigraphically significant volcanic units are present in this area. These include large-volume, regionally distributed ash-flow tuffs and
Authors
Edward A. du Bray, John S. Pallister, Lawrence W. Snee
Composition, age, and petrogenesis of Late Cretaceous intrusive rocks in the central Big Belt Mountains, Broadwater and Meagher counties, Montana
Cretaceous intrusions hosted by the Proterozoic Newland Formation. The northern intrusion, centered on Boulder Baldy, consists of outer, intermediate, and core zones composed of aegirine-augite quartz monzonite, hornblende quartz monzodiorite, and biotite granodiorite, respectively. The southern intrusion, north of Mount Edith, is compositionally indistinguishable from the intermediate zone of the
Authors
E. A. Du Bray, L. W. Snee