Edward A du Bray (Former Employee)
Science and Products
Filter Total Items: 16
Filter Total Items: 99
Subsurface structure of the Silsilah ring complex, as deduced from telluric-electric and audio-magnetotelluric investigation, Kingdom of Saudi Arabia
No abstract available.
Authors
C.J. Zablocki, E. A. Du Bray, C. L. Long, C. L. Tippens
Geology of the Silsilah ring complex, and associated tin mineralization, Kingdom of Saudi Arabia - a synopsis.
A tin greisen deposit is associated with an alkali-feldspar granite that forms part of a ring complex at Jabal as Silsilah. The petrological and geochemical characteristics of the Fawwarah alkali-feldspar granite resemble those of granites located elsewhere that are also associated with deposits of Sn, W and rare metals. The alkali-feldspar granite is peraluminous, incompatible trace-element-enric
Authors
E.A. du Bray
Geology of the Silsilah ring complex, Kingdom of Saudi Arabia
No abstract available.
Authors
E. A. Du Bray
Reconnaissance geology of the Al Mukhul Quadrangle, sheet 26/42 B, Kingdom of Saudi Arabia
The Al Makhul quadrangle (26/42 B) lies in the northern part of the Arabian Shield between lat 26°30' and 27°00' N. and long 42°30' and 43°00' E. Amphibolite, the oldest metamorphic rock exposed in the quadrangle, crops out in a restricted area in the south-central part of the quadrangle. Younger, weakly metamorphosed rhyolite, basalt, and graywacke sandstone on the west edge of the quadrangle are
Authors
E. A. Du Bray
Reconnaissance geology of the Jabal Saq Quadrangle, sheet 26/43 C, Kingdom of Saudi Arabia
The Jabal Saq quadrangle is located in the northeastern part of the Arabian Shield at the northern end of the Najd region between lat 26?00' and 26?30' N. and long 43?00' and 43?30' E. The northeastern two-thirds of the quadrangle is underlain by Paleozoic sedimentary rocks, the southwestern one-third by Proterozoic metamorphic and igneous rocks. The oldest rocks in the quadrangle are weakly metam
Authors
E. A. Du Bray
Geochemical evaluation of felsic plutonic rocks in the eastern and southeastern Arabian Shield, Kingdom of Saudi Arabia
In a geochemical evaluation of the eastern and southeastern Arabian Shield, which included collection of 696 rock samples and 694 pan concentrate samples, a province of tin-anomalous granitoid plutons was defined. Pan concentrates collected in and around these plutons were enriched in tin and tungsten relative to the concentrate population. Rock samples of these leucocratic, muscovite-bearing, per
Authors
E. A. Du Bray, James E. Elliott, D. B. Stoeser
Map showing distribution and classification of felsic plutonic rocks in the eastern Arabian Shield, Kingdom of Saudi Arabia
This 1:500,000-scale compilation shows the distribution of felsic plutonic rocks, lithologic types, and associated mineralization in an area between lat 21° and 24°30’ N., long 43°30’ and 46° E. It is part of a shieldwide compilation being done within the framework of Saudi Arabian Deputy Ministry for Mineral Resources projects 2.04 and 3.12.
Authors
E. A. Du Bray
Mineral potential of selected felsic plutons in the eastern and southeastern Arabian Shield, Kingdom of Saudi Arabia
Sixteen well-defined geochemical anomalies associated with felsic plutons and (or) muscovite-bearing plutons of Proterozoic age have been identified in the eastern and southeastern Arabian Shield. The majority of these plutons are highly evolved, granitophile-element-enriched muscovite-bearing granites that are weakly peraluminous.
A followup study of the mineral potential of these plutons include
Authors
Edward A. du Bray
Reconnaissance geochemical survey of the At Taif-Al Bahah region, southern Hijaz, Kingdom of Saudi Arabia
Pan concentrates were prepared from 265 wadi sediment samples collected during a geochemical reconnaissance conducted between At Taif and Al Bahah to further assess previously identified tungsten anomalies and to locate additional mineralized rock. The samples were analyzed by semiquantitative spectrographic methods for 30 elements, and tungsten was determined by colorimetry. All determinations in
Authors
E. A. Du Bray, J. L. Doebrich
Geochemical analyses for gold and zinc of 137 stream-sediment samples from the John Muir Wilderness, California
No abstract available.
Authors
M. F. Diggles, David A. Dellinger, E. A. Du Bray
Gravity model and structural implications of the Goddard Pendant, Sierra Nevada, California
A subsurface model for the Goddard pendant is constructed from a residual gravity high of about 7 mGal over the pendant. The model, which is the simplest and most geologically reasonable possibility, shows a metamorphic block that tapers with depth and extends about 3.5 km below the surface. The structures in the Goddard pendant are similar in style and orientation to those in other Sierra Nevada
Authors
E.A. du Bray, H. W. Oliver
Evaluation of geochemical sampling media in granitoid terrane of the southern Arabian shield, Kingdom of Saudi Arabia
No abstract available.
Authors
E. A. Du Bray
Science and Products
Filter Total Items: 16
Filter Total Items: 99
Subsurface structure of the Silsilah ring complex, as deduced from telluric-electric and audio-magnetotelluric investigation, Kingdom of Saudi Arabia
No abstract available.
Authors
C.J. Zablocki, E. A. Du Bray, C. L. Long, C. L. Tippens
Geology of the Silsilah ring complex, and associated tin mineralization, Kingdom of Saudi Arabia - a synopsis.
A tin greisen deposit is associated with an alkali-feldspar granite that forms part of a ring complex at Jabal as Silsilah. The petrological and geochemical characteristics of the Fawwarah alkali-feldspar granite resemble those of granites located elsewhere that are also associated with deposits of Sn, W and rare metals. The alkali-feldspar granite is peraluminous, incompatible trace-element-enric
Authors
E.A. du Bray
Geology of the Silsilah ring complex, Kingdom of Saudi Arabia
No abstract available.
Authors
E. A. Du Bray
Reconnaissance geology of the Al Mukhul Quadrangle, sheet 26/42 B, Kingdom of Saudi Arabia
The Al Makhul quadrangle (26/42 B) lies in the northern part of the Arabian Shield between lat 26°30' and 27°00' N. and long 42°30' and 43°00' E. Amphibolite, the oldest metamorphic rock exposed in the quadrangle, crops out in a restricted area in the south-central part of the quadrangle. Younger, weakly metamorphosed rhyolite, basalt, and graywacke sandstone on the west edge of the quadrangle are
Authors
E. A. Du Bray
Reconnaissance geology of the Jabal Saq Quadrangle, sheet 26/43 C, Kingdom of Saudi Arabia
The Jabal Saq quadrangle is located in the northeastern part of the Arabian Shield at the northern end of the Najd region between lat 26?00' and 26?30' N. and long 43?00' and 43?30' E. The northeastern two-thirds of the quadrangle is underlain by Paleozoic sedimentary rocks, the southwestern one-third by Proterozoic metamorphic and igneous rocks. The oldest rocks in the quadrangle are weakly metam
Authors
E. A. Du Bray
Geochemical evaluation of felsic plutonic rocks in the eastern and southeastern Arabian Shield, Kingdom of Saudi Arabia
In a geochemical evaluation of the eastern and southeastern Arabian Shield, which included collection of 696 rock samples and 694 pan concentrate samples, a province of tin-anomalous granitoid plutons was defined. Pan concentrates collected in and around these plutons were enriched in tin and tungsten relative to the concentrate population. Rock samples of these leucocratic, muscovite-bearing, per
Authors
E. A. Du Bray, James E. Elliott, D. B. Stoeser
Map showing distribution and classification of felsic plutonic rocks in the eastern Arabian Shield, Kingdom of Saudi Arabia
This 1:500,000-scale compilation shows the distribution of felsic plutonic rocks, lithologic types, and associated mineralization in an area between lat 21° and 24°30’ N., long 43°30’ and 46° E. It is part of a shieldwide compilation being done within the framework of Saudi Arabian Deputy Ministry for Mineral Resources projects 2.04 and 3.12.
Authors
E. A. Du Bray
Mineral potential of selected felsic plutons in the eastern and southeastern Arabian Shield, Kingdom of Saudi Arabia
Sixteen well-defined geochemical anomalies associated with felsic plutons and (or) muscovite-bearing plutons of Proterozoic age have been identified in the eastern and southeastern Arabian Shield. The majority of these plutons are highly evolved, granitophile-element-enriched muscovite-bearing granites that are weakly peraluminous.
A followup study of the mineral potential of these plutons include
Authors
Edward A. du Bray
Reconnaissance geochemical survey of the At Taif-Al Bahah region, southern Hijaz, Kingdom of Saudi Arabia
Pan concentrates were prepared from 265 wadi sediment samples collected during a geochemical reconnaissance conducted between At Taif and Al Bahah to further assess previously identified tungsten anomalies and to locate additional mineralized rock. The samples were analyzed by semiquantitative spectrographic methods for 30 elements, and tungsten was determined by colorimetry. All determinations in
Authors
E. A. Du Bray, J. L. Doebrich
Geochemical analyses for gold and zinc of 137 stream-sediment samples from the John Muir Wilderness, California
No abstract available.
Authors
M. F. Diggles, David A. Dellinger, E. A. Du Bray
Gravity model and structural implications of the Goddard Pendant, Sierra Nevada, California
A subsurface model for the Goddard pendant is constructed from a residual gravity high of about 7 mGal over the pendant. The model, which is the simplest and most geologically reasonable possibility, shows a metamorphic block that tapers with depth and extends about 3.5 km below the surface. The structures in the Goddard pendant are similar in style and orientation to those in other Sierra Nevada
Authors
E.A. du Bray, H. W. Oliver
Evaluation of geochemical sampling media in granitoid terrane of the southern Arabian shield, Kingdom of Saudi Arabia
No abstract available.
Authors
E. A. Du Bray