Ren Thompson, PhD
Ren Thompson is a Research Geologist with the Geosciences and Environmental Change Science Center
Science and Products
Filter Total Items: 14
Geologic map of the Death Valley ground-water model area, Nevada and California
No abstract available.
Geologic Map of the San Luis Hills Area, Conejos and Costilla Counties, Colorado
This report is a digital image of the U.S. Geological Survey Miscellaneous Investigations Series Map I-1906, 'Geologic map of the San Luis Hills area, Conejos and Costilla Counties, Colorado,' which was published in 1989 by Thompson and Machette, scale 1:50,000 but has been unavailable in a digital version. The map area represents the southwestern portion of the Alamosa 30' x 60' quadrangle, which
Filter Total Items: 29
40Ar/39Ar Geochronology, Isotope Geochemistry (Sr, Nd, Pb), and petrology of alkaline lavas near Yampa, Colorado: migration of alkaline volcanism and evolution of the northern Rio Grande rift
Volcanic rocks near Yampa, Colorado (USA), represent one of several small late Miocene to Quaternary alkaline volcanic fields along the northeast margin of the Colorado Plateau. Basanite, trachybasalt, and basalt collected from six sites within the Yampa volcanic field were investigated to assess correlations with late Cenozoic extension and Rio Grande rifting. In this paper we report major and tr
Authors
Michael A. Cosca, Ren A. Thompson, John P. Lee, Kenzie J. Turner, Leonid A. Neymark, Wayne R. Premo
Oblique transfer of extensional strain between basins of the middle Rio Grande rift, New Mexico: Fault kinematic and paleostress constraints
The structural geometry of transfer and accommodation zones that relay strain between extensional domains in rifted crust has been addressed in many studies over the past 30 years. However, details of the kinematics of deformation and related stress changes within these zones have received relatively little attention. In this study we conduct the first-ever systematic, multi-basin fault-slip measu
Authors
Scott A. Minor, Mark R. Hudson, Jonathan S. Caine, Ren A. Thompson
Geophysical study of the San Juan Mountains batholith complex, southwestern Colorado
One of the largest and most pronounced gravity lows over North America is over the rugged San Juan Mountains of southwestern Colorado (USA). The mountain range is coincident with the San Juan volcanic field (SJVF), the largest erosional remnant of a widespread mid-Cenozoic volcanic field that spanned much of the southern Rocky Mountains. A buried, low-density silicic batholith complex related to t
Authors
Benjamin J. Drenth, G. Randy Keller, Ren A. Thompson
Geophysical expression of elements of the Rio Grande rift in the northeast Tusas Mountains - Preliminary interpretations
New interpretations of the nature of the Rio Grande rift and pre-existing rocks in the northeast Tusas Mountains region are derived from new and existing gravity and aeromagnetic data. 12-15 mGal amplitude gravity lows are interpreted to mainly reflect large thicknesses of the upper Oligocene to upper Miocene, syn-rift Los Pinos Formation and possibly significant amounts of the Eocene El Rito Form
Authors
Benjamin J. Drenth, Kenzie J. Turner, Ren A. Thompson, V. J. Grauch, Michael A. Cosca, John Lee
Cenozoic tectonic reorganizations of the Death Valley region, southeast California and southwest Nevada
The Death Valley region, of southeast California and southwest Nevada, is distinct relative to adjacent regions in its structural style and resulting topography, as well as in the timing of basin-range extension. Cenozoic basin-fill strata, ranging in age from greater than or equal to 40 to approximately 2 million years are common within mountain-range uplifts in this region. The tectonic fragment
Authors
Christopher J. Fridrich, Ren A. Thompson
Preliminary Geologic Map of the North-Central Part of the Alamosa 30' x 60' Quadrangle, Alamosa, Conejos and Costilla Counties, Colorado
This geologic map presents new polygon (geologic map unit contacts) and line (terrace and lacustrine spit/barrier bar) vector data for a map comprised of four 7.5' quadrangles in the north-central part of the Alamosa, Colorado, 30' x 60' quadrangle. The quadrangles include Baldy, Blanca, Blanca SE, and Lasauses. The map database, compiled at 1:50,000 scale from new 1:24,000-scale mapping, provides
Authors
Michael N. Machette, Ren A. Thompson, Theodore R. Brandt
Digital elevation models of the Pre-Eruption 2000 Crater and 2004-07 Dome-Building Eruption at Mount St. Helens, Washington, USA
Presented in this report are 27 digital elevation model (DEM) datasets for the crater area of Mount St. Helens. These datasets include pre-eruption baseline data collected in 2000, incremental model subsets collected during the 2004–07 dome building eruption, and associated shaded-relief image datasets. Each dataset was collected photogrammetrically with digital softcopy methods employing a combin
Authors
James A. Messerich, Steve P. Schilling, Ren A. Thompson
Use of digital aerophotogrammetry to determine rates of lava dome growth, Mount St. Helens, Washington, 2004-2005
Beginning in October 2004, a new lava dome grew on the
glacier-covered crater floor of Mount St. Helens, Washington,
immediately south of the 1980s lava dome. Seventeen digital
elevation models (DEMs) constructed from vertical aerial
photographs have provided quantitative estimates of extruded
lava volumes and total volume change. To extract volumetric
changes and calculate volumetric extrus
Authors
Steve P. Schilling, Ren A. Thompson, James A. Messerich, Eugene Y. Iwatsubo
Preliminary geologic map of the southern Funeral Mountains and adjacent ground-water discharge sites, Inyo County, California, and Nye County, Nevada
This map covers the southern part of the Funeral Mountains, and adjacent parts of four structural basins - Furnace Creek, Amargosa Valley, Opera House, and central Death Valley. It extends over three full 7.5-minute quadrangles, and parts of eleven others - a total area of about 950 square kilometers. The boundaries of this map were drawn to include all of the known proximal hydrogeologic features
Authors
Christopher J. Fridrich, Ren A. Thompson, Janet L. Slate, M. E. Berry, Michael N. Machette
Preliminary Geologic Map of the Sanchez Reservoir Quadrangle and Eastern Part of the Garcia Quadrangle, Costilla County, Colorado
This geologic map is based entirely on new mapping by Thompson and Machette, whereas the geophysical data and interpretations were supplied by Drenth. The map area includes most of San Pedro Mesa, a basalt covered mesa that is uplifted as a horst between the Southern Sangre de Cristo fault zone (on the west) and the San Luis fault zone on the east. The map also includes most of the Sanchez graben
Authors
Ren A. Thompson, Michael N. Machette, Benjamin J. Drenth
Preliminary geologic map of the northwestern part of the Alamosa 30 X 60 minute quadrangle, Alamosa and Conejos Counties, Colorado
No abstract available.
Authors
Michael N. Machette, Ren A. Thompson
Geologic map of the San Antonio Mountain quadrangle, Rio Arriba County, New Mexico
No abstract available.
Authors
Ren A. Thompson, Peter W. Lipman
Science and Products
Filter Total Items: 14
Geologic map of the Death Valley ground-water model area, Nevada and California
No abstract available.
Geologic Map of the San Luis Hills Area, Conejos and Costilla Counties, Colorado
This report is a digital image of the U.S. Geological Survey Miscellaneous Investigations Series Map I-1906, 'Geologic map of the San Luis Hills area, Conejos and Costilla Counties, Colorado,' which was published in 1989 by Thompson and Machette, scale 1:50,000 but has been unavailable in a digital version. The map area represents the southwestern portion of the Alamosa 30' x 60' quadrangle, which
Filter Total Items: 29
40Ar/39Ar Geochronology, Isotope Geochemistry (Sr, Nd, Pb), and petrology of alkaline lavas near Yampa, Colorado: migration of alkaline volcanism and evolution of the northern Rio Grande rift
Volcanic rocks near Yampa, Colorado (USA), represent one of several small late Miocene to Quaternary alkaline volcanic fields along the northeast margin of the Colorado Plateau. Basanite, trachybasalt, and basalt collected from six sites within the Yampa volcanic field were investigated to assess correlations with late Cenozoic extension and Rio Grande rifting. In this paper we report major and tr
Authors
Michael A. Cosca, Ren A. Thompson, John P. Lee, Kenzie J. Turner, Leonid A. Neymark, Wayne R. Premo
Oblique transfer of extensional strain between basins of the middle Rio Grande rift, New Mexico: Fault kinematic and paleostress constraints
The structural geometry of transfer and accommodation zones that relay strain between extensional domains in rifted crust has been addressed in many studies over the past 30 years. However, details of the kinematics of deformation and related stress changes within these zones have received relatively little attention. In this study we conduct the first-ever systematic, multi-basin fault-slip measu
Authors
Scott A. Minor, Mark R. Hudson, Jonathan S. Caine, Ren A. Thompson
Geophysical study of the San Juan Mountains batholith complex, southwestern Colorado
One of the largest and most pronounced gravity lows over North America is over the rugged San Juan Mountains of southwestern Colorado (USA). The mountain range is coincident with the San Juan volcanic field (SJVF), the largest erosional remnant of a widespread mid-Cenozoic volcanic field that spanned much of the southern Rocky Mountains. A buried, low-density silicic batholith complex related to t
Authors
Benjamin J. Drenth, G. Randy Keller, Ren A. Thompson
Geophysical expression of elements of the Rio Grande rift in the northeast Tusas Mountains - Preliminary interpretations
New interpretations of the nature of the Rio Grande rift and pre-existing rocks in the northeast Tusas Mountains region are derived from new and existing gravity and aeromagnetic data. 12-15 mGal amplitude gravity lows are interpreted to mainly reflect large thicknesses of the upper Oligocene to upper Miocene, syn-rift Los Pinos Formation and possibly significant amounts of the Eocene El Rito Form
Authors
Benjamin J. Drenth, Kenzie J. Turner, Ren A. Thompson, V. J. Grauch, Michael A. Cosca, John Lee
Cenozoic tectonic reorganizations of the Death Valley region, southeast California and southwest Nevada
The Death Valley region, of southeast California and southwest Nevada, is distinct relative to adjacent regions in its structural style and resulting topography, as well as in the timing of basin-range extension. Cenozoic basin-fill strata, ranging in age from greater than or equal to 40 to approximately 2 million years are common within mountain-range uplifts in this region. The tectonic fragment
Authors
Christopher J. Fridrich, Ren A. Thompson
Preliminary Geologic Map of the North-Central Part of the Alamosa 30' x 60' Quadrangle, Alamosa, Conejos and Costilla Counties, Colorado
This geologic map presents new polygon (geologic map unit contacts) and line (terrace and lacustrine spit/barrier bar) vector data for a map comprised of four 7.5' quadrangles in the north-central part of the Alamosa, Colorado, 30' x 60' quadrangle. The quadrangles include Baldy, Blanca, Blanca SE, and Lasauses. The map database, compiled at 1:50,000 scale from new 1:24,000-scale mapping, provides
Authors
Michael N. Machette, Ren A. Thompson, Theodore R. Brandt
Digital elevation models of the Pre-Eruption 2000 Crater and 2004-07 Dome-Building Eruption at Mount St. Helens, Washington, USA
Presented in this report are 27 digital elevation model (DEM) datasets for the crater area of Mount St. Helens. These datasets include pre-eruption baseline data collected in 2000, incremental model subsets collected during the 2004–07 dome building eruption, and associated shaded-relief image datasets. Each dataset was collected photogrammetrically with digital softcopy methods employing a combin
Authors
James A. Messerich, Steve P. Schilling, Ren A. Thompson
Use of digital aerophotogrammetry to determine rates of lava dome growth, Mount St. Helens, Washington, 2004-2005
Beginning in October 2004, a new lava dome grew on the
glacier-covered crater floor of Mount St. Helens, Washington,
immediately south of the 1980s lava dome. Seventeen digital
elevation models (DEMs) constructed from vertical aerial
photographs have provided quantitative estimates of extruded
lava volumes and total volume change. To extract volumetric
changes and calculate volumetric extrus
Authors
Steve P. Schilling, Ren A. Thompson, James A. Messerich, Eugene Y. Iwatsubo
Preliminary geologic map of the southern Funeral Mountains and adjacent ground-water discharge sites, Inyo County, California, and Nye County, Nevada
This map covers the southern part of the Funeral Mountains, and adjacent parts of four structural basins - Furnace Creek, Amargosa Valley, Opera House, and central Death Valley. It extends over three full 7.5-minute quadrangles, and parts of eleven others - a total area of about 950 square kilometers. The boundaries of this map were drawn to include all of the known proximal hydrogeologic features
Authors
Christopher J. Fridrich, Ren A. Thompson, Janet L. Slate, M. E. Berry, Michael N. Machette
Preliminary Geologic Map of the Sanchez Reservoir Quadrangle and Eastern Part of the Garcia Quadrangle, Costilla County, Colorado
This geologic map is based entirely on new mapping by Thompson and Machette, whereas the geophysical data and interpretations were supplied by Drenth. The map area includes most of San Pedro Mesa, a basalt covered mesa that is uplifted as a horst between the Southern Sangre de Cristo fault zone (on the west) and the San Luis fault zone on the east. The map also includes most of the Sanchez graben
Authors
Ren A. Thompson, Michael N. Machette, Benjamin J. Drenth
Preliminary geologic map of the northwestern part of the Alamosa 30 X 60 minute quadrangle, Alamosa and Conejos Counties, Colorado
No abstract available.
Authors
Michael N. Machette, Ren A. Thompson
Geologic map of the San Antonio Mountain quadrangle, Rio Arriba County, New Mexico
No abstract available.
Authors
Ren A. Thompson, Peter W. Lipman