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Papers by Michael Grubensky

Research paper thumbnail of Detailed geologic map and cross sections of the Big Horn and Belmont Mountains, West-central Arizona

Arizona Geological Survey (Tucson, AZ), 1994

The principal geologic feature of the Big Hom and Belmont Mountains is a complexly faulted and ti... more The principal geologic feature of the Big Hom and Belmont Mountains is a complexly faulted and tilted series of mostly Miocene volcanic rock that record a period of Middle Tertiary magmatism and extension. These volcanic rocks vary widely in composition, but basaltic and rhyolitic rocks are most abundant (Figure 1). Intrusive equivalents of these volcanics exposed in the Belmont Mountains are dominantly granitic. Despite the large volume of rhyolite erupted, small, coalescing flow and dome complexes were formed in preference to large-volume ash-flow tuffs, and no collapse calderas were formed. These rocks lie in the upper plate ofthe regional Whipple-Buckskin-Bullard detachment fault [Rehrig and Reynolds, 1980], at its southeastern tip [Richard et aI, 1990a]. A regional boundary between major tilts domains in Tertiary strata follows an irregular course from northwest to southeast through the range [Rehrig et aI., 1980]. Northeast of this boundary, strata dip to the northeast, and southwest of the boundary, Tertiary strata dip to the southwest. Pre-Tertiary rocks are exposed in several parts of the range. These rocks consist of a Laramide-age (71-63 Ma)hornblende-biotite granodiorite, informally referred to as the Big Hom granodiorite, which intrudes a complex of Proterozoic igneous and metamorphic rocks. Metamorphic grade in the Proterozoic rocks increases from southeast to northwest, and associated igneous rocks become more abundant to the northwest. In the southeast the Proterozoic rocks consist of highly deformed, greenschist facies, mafic and pelitic schist. These grade to heterogeneous mafic-tointermediate- composition gneiss to the northwest. Report with geologic map and cross sections of the Big Horn and Belmont Mountains, west-central Arizona. Scale 1:50,000.Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu

Research paper thumbnail of Geologic map of the Wickenburg, Southern Buckhorn, and Northwestern Hieroglyphic Mountains, central Arizona

This report describes the geology of the Red Picacho quadrangle and parts of the Wickenburg, Garf... more This report describes the geology of the Red Picacho quadrangle and parts of the Wickenburg, Garfias Mountain, and Wittman quadrangles. The map area comprises metamorphic-plutonic basement unconformably overlain by Tertiary volcanic and sedimentary rocks. Geologic map of the Wickenburg, Southern Buckhorn, and Northwestern Hieroglyphic Mountains, central Arizona Scale 1:24,000, with report.Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu

Research paper thumbnail of Geologic map of the Vulture Mountains, west-central Arizona: Wickenburg SW, Vulture Mine, Wildcat Well, Wickenburg, Vulture Peak, Outlaw Hill, Black Butte, and Forepaugh Peak 7.5 min

Geologic map of west-central area including Wickenburg, Vulture Peak. Three map plates at 1:24,00... more Geologic map of west-central area including Wickenburg, Vulture Peak. Three map plates at 1:24,000 map scale.Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu

Research paper thumbnail of Geologic map of the Little Horn Mountains 15' Quadrangle, Southwestern Arizona

Geologic map of the Little Horn Mountains of SW Arizona. Includes cross section and text report.

Research paper thumbnail of Geologic map of the Pelican Point Quadrangle, Malheur County, Oregon

Research paper thumbnail of Geologic map of the Castle Dome Mountains, southwestern Arizona

Research paper thumbnail of Geologic map of the southeastern Kofa Mountains and western Tank Mountains, southwestern Arizona

Research paper thumbnail of Geologic map of the Wildhorse Lake quadrangle, Harney County, Oregon

Research paper thumbnail of Geologic map of the High Steens and Little Blitzen Gorge Wilderness Study Areas, Harney County, Oregon

Title from PDF caption (viewed on April 10, 2019).Relief shown by contours and spot heights.Inclu... more Title from PDF caption (viewed on April 10, 2019).Relief shown by contours and spot heights.Includes text, index map, and bibliography.This archived document is maintained by the State Library of Oregon as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes.Mode of access: Internet from the State Library of Oregon U.S. Government Publications Collection.Text in English

Research paper thumbnail of Geologic map of the Rooster Comb Quadrangle, Malheur County, Oregon

Research paper thumbnail of Geologic map of the Ajo and Lukeville 1 degrees by 2 degrees quadrangle, Southwest Arizona

Research paper thumbnail of Mineral resource assessment of the Kofa National Wildlife Refuge, Arizona

Open-File Report, 1987

Past production from mineral deposits tabulated according to mining district in the KNWR. All pro... more Past production from mineral deposits tabulated according to mining district in the KNWR. All production data are from Keith (1978). 8. Past production from individual mineral deposits in the KNWR as classified by mineral deposit type. The production data are from Keith (1978).

Research paper thumbnail of Geologic Map of the Southeastern Vulture Mountains, West-Central Arizona

Arizona Geological Survey (Tucson, AZ), Feb 1, 1988

The Vulture Mountains are situated in west-central Arizona, between the Big Horn and Harquahala M... more The Vulture Mountains are situated in west-central Arizona, between the Big Horn and Harquahala Mountains on the west, and the Wickenburg Mountains on the east. Although a range of low relief, the Vulture Mountains are sufficiently a really extensive in that they cover all or part of eight individual 7.5 minute quadrangles. The geologic map of the southeastern Vulture Mountains (Fig. 1), a product of this study, covers the northern part of the Wickenburg SW 7.5 minute quadrangle. Most of the few precipitous bluffs and ridges of the range are in the eastern quarter of the range, and have roughly 200 m of relief. Detailed geologic mapping in the Vulture Mountains has been limited to the northeastern part (Grubensky and others, 1987). Geochronologic studies of rocks in the central and northern Vulture Mountains (Rehrig and others, 1980) provide the only available K-Ar dates of any of the rocks in the range. This report is considered preliminary and is part of an ongoing project to map and study the entire Vulture Mountains. The Vulture Mountains are important for three fundamental reasons. The first is that the Vulture Mountains are, at present, largely unmapped. Second, the Vulture Mountains contain an excellent record of the mid-Tertiary structural and volcanic history of the region, which is of general interest to the geologic community....study included 1:24,000-scale topographic maps.Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu

Research paper thumbnail of Geologic Map of the Vulture Mine Area, Vulture Mountains, West-Central Arizona

Research paper thumbnail of Geologic map of the Vulture Peak 7.5' Quadrangle, Maricopa County, Arizona

Arizona Geological Survey (Tucson, AZ), 2021

This geologic map is one of a series of four 7 ½’ quadrangle maps (AZGS DGM-131 through 134; Wick... more This geologic map is one of a series of four 7 ½’ quadrangle maps (AZGS DGM-131 through 134; Wickenburg, Sam Powell Peak, Flores, and Vulture Peak) in the Wickenburg area. New surficial mapping was conducted throughout the 4-quadrangle mapping area and bedrock mapping was compiled from existing geologic maps. Together, these maps include detailed surficial mapping of alluvium from the Date Creek, Weaver, Wickenburg, and Vulture Mountains as well as ancestral deposits of the Hassayampa River. The relationships between relict and modern alluvial fan and Hassayampa River deposits and their positions relative to pre-existing bedrock topography presents a glimpse into the arrival and development of the modern Hassayampa River system.Documents in the AZGS Documents Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu

Research paper thumbnail of Geologic Map of the Wickenburg 7.5' Quadrangle, Maricopa and Yavapai County, Arizona

Arizona Geological Survey (Tucson, AZ), 2021

Research paper thumbnail of Mineral resources of the Gibraltar Mountain and Planet Peak Wilderness Study Areas, La Paz County, Arizona

Research paper thumbnail of Geologic map of the Vicksburg quadrangle, La Paz County, Arizona

Research paper thumbnail of Geologic Map of the Southern Hieroglyphic Mountains, Central Arizona

Research paper thumbnail of The Orocopia Schist in southwest Arizona: Early Tertiary oceanic rocks trapped or transported far inland

Special Paper 365: Contributions to Crustal Evolution of the Southwestern United States, 2002

Research paper thumbnail of Detailed geologic map and cross sections of the Big Horn and Belmont Mountains, West-central Arizona

Arizona Geological Survey (Tucson, AZ), 1994

The principal geologic feature of the Big Hom and Belmont Mountains is a complexly faulted and ti... more The principal geologic feature of the Big Hom and Belmont Mountains is a complexly faulted and tilted series of mostly Miocene volcanic rock that record a period of Middle Tertiary magmatism and extension. These volcanic rocks vary widely in composition, but basaltic and rhyolitic rocks are most abundant (Figure 1). Intrusive equivalents of these volcanics exposed in the Belmont Mountains are dominantly granitic. Despite the large volume of rhyolite erupted, small, coalescing flow and dome complexes were formed in preference to large-volume ash-flow tuffs, and no collapse calderas were formed. These rocks lie in the upper plate ofthe regional Whipple-Buckskin-Bullard detachment fault [Rehrig and Reynolds, 1980], at its southeastern tip [Richard et aI, 1990a]. A regional boundary between major tilts domains in Tertiary strata follows an irregular course from northwest to southeast through the range [Rehrig et aI., 1980]. Northeast of this boundary, strata dip to the northeast, and southwest of the boundary, Tertiary strata dip to the southwest. Pre-Tertiary rocks are exposed in several parts of the range. These rocks consist of a Laramide-age (71-63 Ma)hornblende-biotite granodiorite, informally referred to as the Big Hom granodiorite, which intrudes a complex of Proterozoic igneous and metamorphic rocks. Metamorphic grade in the Proterozoic rocks increases from southeast to northwest, and associated igneous rocks become more abundant to the northwest. In the southeast the Proterozoic rocks consist of highly deformed, greenschist facies, mafic and pelitic schist. These grade to heterogeneous mafic-tointermediate- composition gneiss to the northwest. Report with geologic map and cross sections of the Big Horn and Belmont Mountains, west-central Arizona. Scale 1:50,000.Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu

Research paper thumbnail of Geologic map of the Wickenburg, Southern Buckhorn, and Northwestern Hieroglyphic Mountains, central Arizona

This report describes the geology of the Red Picacho quadrangle and parts of the Wickenburg, Garf... more This report describes the geology of the Red Picacho quadrangle and parts of the Wickenburg, Garfias Mountain, and Wittman quadrangles. The map area comprises metamorphic-plutonic basement unconformably overlain by Tertiary volcanic and sedimentary rocks. Geologic map of the Wickenburg, Southern Buckhorn, and Northwestern Hieroglyphic Mountains, central Arizona Scale 1:24,000, with report.Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu

Research paper thumbnail of Geologic map of the Vulture Mountains, west-central Arizona: Wickenburg SW, Vulture Mine, Wildcat Well, Wickenburg, Vulture Peak, Outlaw Hill, Black Butte, and Forepaugh Peak 7.5 min

Geologic map of west-central area including Wickenburg, Vulture Peak. Three map plates at 1:24,00... more Geologic map of west-central area including Wickenburg, Vulture Peak. Three map plates at 1:24,000 map scale.Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu

Research paper thumbnail of Geologic map of the Little Horn Mountains 15' Quadrangle, Southwestern Arizona

Geologic map of the Little Horn Mountains of SW Arizona. Includes cross section and text report.

Research paper thumbnail of Geologic map of the Pelican Point Quadrangle, Malheur County, Oregon

Research paper thumbnail of Geologic map of the Castle Dome Mountains, southwestern Arizona

Research paper thumbnail of Geologic map of the southeastern Kofa Mountains and western Tank Mountains, southwestern Arizona

Research paper thumbnail of Geologic map of the Wildhorse Lake quadrangle, Harney County, Oregon

Research paper thumbnail of Geologic map of the High Steens and Little Blitzen Gorge Wilderness Study Areas, Harney County, Oregon

Title from PDF caption (viewed on April 10, 2019).Relief shown by contours and spot heights.Inclu... more Title from PDF caption (viewed on April 10, 2019).Relief shown by contours and spot heights.Includes text, index map, and bibliography.This archived document is maintained by the State Library of Oregon as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes.Mode of access: Internet from the State Library of Oregon U.S. Government Publications Collection.Text in English

Research paper thumbnail of Geologic map of the Rooster Comb Quadrangle, Malheur County, Oregon

Research paper thumbnail of Geologic map of the Ajo and Lukeville 1 degrees by 2 degrees quadrangle, Southwest Arizona

Research paper thumbnail of Mineral resource assessment of the Kofa National Wildlife Refuge, Arizona

Open-File Report, 1987

Past production from mineral deposits tabulated according to mining district in the KNWR. All pro... more Past production from mineral deposits tabulated according to mining district in the KNWR. All production data are from Keith (1978). 8. Past production from individual mineral deposits in the KNWR as classified by mineral deposit type. The production data are from Keith (1978).

Research paper thumbnail of Geologic Map of the Southeastern Vulture Mountains, West-Central Arizona

Arizona Geological Survey (Tucson, AZ), Feb 1, 1988

The Vulture Mountains are situated in west-central Arizona, between the Big Horn and Harquahala M... more The Vulture Mountains are situated in west-central Arizona, between the Big Horn and Harquahala Mountains on the west, and the Wickenburg Mountains on the east. Although a range of low relief, the Vulture Mountains are sufficiently a really extensive in that they cover all or part of eight individual 7.5 minute quadrangles. The geologic map of the southeastern Vulture Mountains (Fig. 1), a product of this study, covers the northern part of the Wickenburg SW 7.5 minute quadrangle. Most of the few precipitous bluffs and ridges of the range are in the eastern quarter of the range, and have roughly 200 m of relief. Detailed geologic mapping in the Vulture Mountains has been limited to the northeastern part (Grubensky and others, 1987). Geochronologic studies of rocks in the central and northern Vulture Mountains (Rehrig and others, 1980) provide the only available K-Ar dates of any of the rocks in the range. This report is considered preliminary and is part of an ongoing project to map and study the entire Vulture Mountains. The Vulture Mountains are important for three fundamental reasons. The first is that the Vulture Mountains are, at present, largely unmapped. Second, the Vulture Mountains contain an excellent record of the mid-Tertiary structural and volcanic history of the region, which is of general interest to the geologic community....study included 1:24,000-scale topographic maps.Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu

Research paper thumbnail of Geologic Map of the Vulture Mine Area, Vulture Mountains, West-Central Arizona

Research paper thumbnail of Geologic map of the Vulture Peak 7.5' Quadrangle, Maricopa County, Arizona

Arizona Geological Survey (Tucson, AZ), 2021

This geologic map is one of a series of four 7 ½’ quadrangle maps (AZGS DGM-131 through 134; Wick... more This geologic map is one of a series of four 7 ½’ quadrangle maps (AZGS DGM-131 through 134; Wickenburg, Sam Powell Peak, Flores, and Vulture Peak) in the Wickenburg area. New surficial mapping was conducted throughout the 4-quadrangle mapping area and bedrock mapping was compiled from existing geologic maps. Together, these maps include detailed surficial mapping of alluvium from the Date Creek, Weaver, Wickenburg, and Vulture Mountains as well as ancestral deposits of the Hassayampa River. The relationships between relict and modern alluvial fan and Hassayampa River deposits and their positions relative to pre-existing bedrock topography presents a glimpse into the arrival and development of the modern Hassayampa River system.Documents in the AZGS Documents Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu

Research paper thumbnail of Geologic Map of the Wickenburg 7.5' Quadrangle, Maricopa and Yavapai County, Arizona

Arizona Geological Survey (Tucson, AZ), 2021

Research paper thumbnail of Mineral resources of the Gibraltar Mountain and Planet Peak Wilderness Study Areas, La Paz County, Arizona

Research paper thumbnail of Geologic map of the Vicksburg quadrangle, La Paz County, Arizona

Research paper thumbnail of Geologic Map of the Southern Hieroglyphic Mountains, Central Arizona

Research paper thumbnail of The Orocopia Schist in southwest Arizona: Early Tertiary oceanic rocks trapped or transported far inland

Special Paper 365: Contributions to Crustal Evolution of the Southwestern United States, 2002