Geology of the Southwestern High Plateaus of Utah: Bear Valley Formation, an Oligocene-Miocene Volcanic Arenite

Anderson, John J.

doi:10.1130/0016-7606(1971)82[1179:gotshp]2.0.co;2

Cited by 12 publications

(41 citation statements)

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“…The allochthonous rocks overlie autochthonous rocks of generally simple structure. Those on the plateau have been described by Iivari (1979), Judy (1974), Anderson (1985), Sable and Anderson (1985), Anderson and others (1987), and, in more detail, by ; those in the western Markagunt Plateau and Red Hills were described by Maldonado and others ( 1994) and . The megabreccias are widespread, but not continuously exposed, over an area of more than 500 km 2 .…”

Section: Introduction and Frameworkmentioning

confidence: 88%

“…The faults cut the laccolith and related dikes and are therefore younger than 20 Ma; some may have remained active into the Pleistocene (Anderson and Christenson, 1989). Anderson (1985Anderson ( , 1988 has presented evidence from the northern Markagunt Plateau that west-northwest-striking faults formed about 26 Ma. These faults are present in the northeastern part of the area (Mortensen Canyon, location B on pl.…”

Section: Anastomosing High-angle Faultsmentioning

confidence: 99%

“…1) but discontinuous. They are composed of numerous allochthonous blocks of Tertiary volcanic and sedimentary rocks as much as 2.5 km 2 in area and about 100 m thick (Sable and Anderson, 1985), and that occur over an area of more than 1,000 km 2 (E.G. Sable, oral commun., 1993).…”

Section: Features Related To Structural Deformation Tertiary Megabrecmentioning

confidence: 99%

“…He attributed the development of other parts of the megabreccia to seismic shaking along west-northwest-trending high-angle faults that resulted in southward sliding of megabreccia bodies down the dipslopes of the tilted fault blocks, as well as northward scarp collapse. According to Anderson (1985Anderson ( , 1988, the west-northwest-trending faults originated in mid-Oligocene time and were active into the Miocene; their topographically prominent fault scarps controlled the distribution and thickness of tuff units such as those of the Needles Range Group and Isom Formation.…”

Section: Breccias and Megabreccias Markagunt Plateau Utah 159mentioning

confidence: 99%

“…As discussed previously, he also invoked localized southward gravity sliding down dip slopes of south-tilted fault blocks that were bounded by west-northwest-striking high-angle faults, and the northward collapse of north-facing scarps produced by these faults. Prior to these interpretations, Wagner (1984) and Anderson ( 1985) had proposed a southward sliding direction for the main Markagunt megabreccia.…”

Section: Markagunt Megabreccia (Restricted) Description and Relationsmentioning

confidence: 99%

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Geologic studies in the Basin and Range-Colorado Plateau transition in southeastern Nevada, southwestern Utah, and northwestern Arizona, 1995

Maldonado¹,

Nealey²

1997

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Section: Introduction and Frameworkmentioning

confidence: 88%

Section: Anastomosing High-angle Faultsmentioning

confidence: 99%

Section: Features Related To Structural Deformation Tertiary Megabrecmentioning

confidence: 99%

Section: Breccias and Megabreccias Markagunt Plateau Utah 159mentioning

confidence: 99%

Section: Markagunt Megabreccia (Restricted) Description and Relationsmentioning

confidence: 99%

See 3 more Smart Citations

Geologic studies in the Basin and Range-Colorado Plateau transition in southeastern Nevada, southwestern Utah, and northwestern Arizona, 1995

Maldonado¹,

Nealey²

1997

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The Caliente-Enterprise Zone, southeastern Nevada and southwestern Utah

Axen¹

1998

Accommodation Zones and Transfer Zones; The Regional Segmentation of the Basin and Range Province

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The Caliente-Enterprise zone trends generally east-northeast for more than 220 km, disrupting the north-south structural grain of the Basin and Range province of the United States. It provides an excellent example of the evolving geometry, longitudinal growth, and structural-magmatic complexity of a large, long-lived (>30 Ma) transverse structural zone that persisted through multiple episodes of extension in a region of high extensional strain. The Caliente-Enterprise zone can be divided into three parts: The eastern part follows an east-west-trending segment of the Colorado Plateau margin, the central part coincides with the Caliente caldera complex, and the western part is formed by transfer faults of the Pahranagat fault zone.The earliest Cenozoic activity along the Caliente-Enterprise zone was in early Oligocene time, when the central and eastern parts formed the southern boundary of an extensional belt of that age. Within this belt, significant upper crustal disruption and west tilting of miogeoclinal strata occurred above the Stampede detachment, between the Seaman Range breakaway on the west and the Condor Canyon area on the east. Minor upper crustal extension may have persisted as far east as the present High Plateaus transition zone. The exact geometry of the Caliente-Enterprise zone during this event is unknown, but it was a tilt-domain boundary between west-tilted, normal-faulted rocks to the north and the unextended thrust belt to the south.Following cessation of slip on the Stampede detachment and related faults, an east-west-trending, south-migrating magmatic arc arrived at the Caliente-Enterprise zone and stalled there for >10 m.y., forming the Caliente caldera complex, shallow plutons farther east, and the Marysvale volcanic complex at its east end. Unextended crust south of the Caliente-Enterprise zone may have inhibited further southward migration of the magmatic arc.The east and central parts were reutilized in mid-Miocene time. The westdirected Highland detachment formed to the north during late eruptive activity (after ca. 18 Ma) in the Caliente caldera complex. The area south of the Caliente-Enterprise zone began to extend on the Mormon Peak-Tule Springs-Castle Cliff detachment system at about the same time, but that system probably outlived the Highland detachment and is largely responsible for the modern physiography south of the central Caliente-Enterprise zone. Volcanic strata above these detachments were tilted east on both sides of the Caliente-Enterprise zone, suggesting that it acted as a transfer zone in this time step. In contrast, the modern basin and range topography north of the Caliente-Enterprise zone formed in late Miocene-Quaternary time along west-dipping Axen, G. J., fault systems younger than the Highland detachment. The Pahranagat fault zone formed on the west, lengthening the Caliente-Enterprise zone by ~40-50 km and transferring late Miocene-Quaternary extension from Dry Lake-Delamar Valley to the southwest. Meadow Valley, north of the central Caliente-Enterprise zone,...

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