David A John
David is a Scientist Emeritus with the Geology, Minerals, Energy, and Geophysics Science Center
Science and Products
Filter Total Items: 59
Magmatic and tectonic evolution of the Caetano caldera, north-central Nevada: A tilted, mid-Tertiary eruptive center and source of the Caetano Tuff Magmatic and tectonic evolution of the Caetano caldera, north-central Nevada: A tilted, mid-Tertiary eruptive center and source of the Caetano Tuff
The Caetano Tuff is a late Eocene, rhyolite ash-flow tuff that crops out within an ∼90-km-long, east-west–trending belt in north-central Nevada, previously interpreted as an elongate graben or “volcano-tectonic trough.” New field, petrographic, geochemical, and geochronologic data show that: (1) the east half of the “trough” is actually the Caetano caldera, formed by eruption of the...
Authors
David A. John, Christopher D. Henry, Joseph P. Colgan
Large-magnitude Miocene extension of the Eocene Caetano caldera, Shoshone and Toiyabe Ranges, Nevada Large-magnitude Miocene extension of the Eocene Caetano caldera, Shoshone and Toiyabe Ranges, Nevada
Because major mineral deposits in north-central Nevada predate significant Basin and Range extension, a detailed understanding of the timing and kinematics of extensional faulting is necessary to place these deposits in their original structural context. The complexity of pre-Cenozoic deformation in northern Nevada makes restoring Basin and Range faulting difficult without locating well...
Authors
Joseph P. Colgan, David A. John, Christopher D. Henry, Robert J. Fleck
Three-dimensional geologic model of the northern Nevada rift and the Beowawe geothermal system, north-central Nevada Three-dimensional geologic model of the northern Nevada rift and the Beowawe geothermal system, north-central Nevada
A three-dimensional (3D) geologic model of part of the northern Nevada rift encompassing the Beowawe geothermal system was developed from a series of two-dimensional (2D) geologic and geophysical models. The 3D model was constrained by local geophysical, geologic, and drill-hole information and integrates geologic and tectonic interpretations for the region. It places important geologic
Authors
Janet Watt, Jonathan M.G. Glen, David A. John, David A. Ponce
USGS science in Menlo Park -- a science strategy for the U.S. Geological Survey Menlo Park Science Center, 2005-2015 USGS science in Menlo Park -- a science strategy for the U.S. Geological Survey Menlo Park Science Center, 2005-2015
In the spring of 2004, the U.S. Geological Survey (USGS) Menlo Park Center Council commissioned an interdisciplinary working group to develop a forward-looking science strategy for the USGS Menlo Park Science Center in California (hereafter also referred to as "the Center"). The Center has been the flagship research center for the USGS in the western United States for more than 50 years...
Authors
Thomas M. Brocher, Michael D. Carr, David L. Halsing, David A. John, Victoria E. Langenheim, Margaret T. Mangan, Mark C. Marvin-DiPasquale, John Y. Takekawa, Claire R. Tiedeman
By
Natural Hazards Mission Area, Water Resources Mission Area, Ecosystems Mission Area, Volcano Hazards Program, Earthquake Hazards Program, Volcano Science Center, Earthquake Science Center, Western Ecological Research Center (WERC), Alaska Science Center, Geology, Minerals, Energy, and Geophysics Science Center
Geochemical database for volcanic rocks of the western Cascades, Washington, Oregon, and California Geochemical database for volcanic rocks of the western Cascades, Washington, Oregon, and California
No abstract available.
Authors
Edward A. du Bray, David A. John, David R. Sherrod, Russell C. Evarts, Richard M. Conrey, Jaroslav Lexa
Assessment of metallic mineral resources in the Humboldt River Basin, Northern Nevada, with a section on Platinum-Group-Element (PGE) potential of the Humboldt mafic complex Assessment of metallic mineral resources in the Humboldt River Basin, Northern Nevada, with a section on Platinum-Group-Element (PGE) potential of the Humboldt mafic complex
The Humboldt River Basin is an arid to semiarid, internally drained basin that covers approximately 43,000 km2 in northern Nevada. The basin contains a wide variety of metallic and nonmetallic mineral deposits and occurrences, and, at various times, the area has been one of the Nation's leading or important producers of gold, silver, copper, mercury, and tungsten. Nevada currently (2003)...
Authors
Alan R. Wallace, Steve Ludington, Mark J. Mihalasky, Stephen G. Peters, Ted G. Theodore, David A. Ponce, David A. John, Byron R. Berger, Michael L. Zientek, Gary B. Sidder, Robert A. Zierenberg
Science and Products
Filter Total Items: 59
Magmatic and tectonic evolution of the Caetano caldera, north-central Nevada: A tilted, mid-Tertiary eruptive center and source of the Caetano Tuff Magmatic and tectonic evolution of the Caetano caldera, north-central Nevada: A tilted, mid-Tertiary eruptive center and source of the Caetano Tuff
The Caetano Tuff is a late Eocene, rhyolite ash-flow tuff that crops out within an ∼90-km-long, east-west–trending belt in north-central Nevada, previously interpreted as an elongate graben or “volcano-tectonic trough.” New field, petrographic, geochemical, and geochronologic data show that: (1) the east half of the “trough” is actually the Caetano caldera, formed by eruption of the...
Authors
David A. John, Christopher D. Henry, Joseph P. Colgan
Large-magnitude Miocene extension of the Eocene Caetano caldera, Shoshone and Toiyabe Ranges, Nevada Large-magnitude Miocene extension of the Eocene Caetano caldera, Shoshone and Toiyabe Ranges, Nevada
Because major mineral deposits in north-central Nevada predate significant Basin and Range extension, a detailed understanding of the timing and kinematics of extensional faulting is necessary to place these deposits in their original structural context. The complexity of pre-Cenozoic deformation in northern Nevada makes restoring Basin and Range faulting difficult without locating well...
Authors
Joseph P. Colgan, David A. John, Christopher D. Henry, Robert J. Fleck
Three-dimensional geologic model of the northern Nevada rift and the Beowawe geothermal system, north-central Nevada Three-dimensional geologic model of the northern Nevada rift and the Beowawe geothermal system, north-central Nevada
A three-dimensional (3D) geologic model of part of the northern Nevada rift encompassing the Beowawe geothermal system was developed from a series of two-dimensional (2D) geologic and geophysical models. The 3D model was constrained by local geophysical, geologic, and drill-hole information and integrates geologic and tectonic interpretations for the region. It places important geologic
Authors
Janet Watt, Jonathan M.G. Glen, David A. John, David A. Ponce
USGS science in Menlo Park -- a science strategy for the U.S. Geological Survey Menlo Park Science Center, 2005-2015 USGS science in Menlo Park -- a science strategy for the U.S. Geological Survey Menlo Park Science Center, 2005-2015
In the spring of 2004, the U.S. Geological Survey (USGS) Menlo Park Center Council commissioned an interdisciplinary working group to develop a forward-looking science strategy for the USGS Menlo Park Science Center in California (hereafter also referred to as "the Center"). The Center has been the flagship research center for the USGS in the western United States for more than 50 years...
Authors
Thomas M. Brocher, Michael D. Carr, David L. Halsing, David A. John, Victoria E. Langenheim, Margaret T. Mangan, Mark C. Marvin-DiPasquale, John Y. Takekawa, Claire R. Tiedeman
By
Natural Hazards Mission Area, Water Resources Mission Area, Ecosystems Mission Area, Volcano Hazards Program, Earthquake Hazards Program, Volcano Science Center, Earthquake Science Center, Western Ecological Research Center (WERC), Alaska Science Center, Geology, Minerals, Energy, and Geophysics Science Center
Geochemical database for volcanic rocks of the western Cascades, Washington, Oregon, and California Geochemical database for volcanic rocks of the western Cascades, Washington, Oregon, and California
No abstract available.
Authors
Edward A. du Bray, David A. John, David R. Sherrod, Russell C. Evarts, Richard M. Conrey, Jaroslav Lexa
Assessment of metallic mineral resources in the Humboldt River Basin, Northern Nevada, with a section on Platinum-Group-Element (PGE) potential of the Humboldt mafic complex Assessment of metallic mineral resources in the Humboldt River Basin, Northern Nevada, with a section on Platinum-Group-Element (PGE) potential of the Humboldt mafic complex
The Humboldt River Basin is an arid to semiarid, internally drained basin that covers approximately 43,000 km2 in northern Nevada. The basin contains a wide variety of metallic and nonmetallic mineral deposits and occurrences, and, at various times, the area has been one of the Nation's leading or important producers of gold, silver, copper, mercury, and tungsten. Nevada currently (2003)...
Authors
Alan R. Wallace, Steve Ludington, Mark J. Mihalasky, Stephen G. Peters, Ted G. Theodore, David A. Ponce, David A. John, Byron R. Berger, Michael L. Zientek, Gary B. Sidder, Robert A. Zierenberg