Major structural controls on the distribution of pre-Tertiary rocks, Nevada Test Site vicinity, southern Nevada

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Description

The lateral and vertical distributions of Proterozoic and Paleozoic sedimentary rocks in southern Nevada are the combined products of original stratigraphic relationships and post-depositional faults and folds. This map compilation shows the distribution of the pre-Tertiary rocks in the region including and surrounding the Nevada Test Site. It is based on considerable new evidence from detailed geologic mapping, biostratigraphic control, sedimentological analysis, and a review of regional map relationships. Proterozoic and Paleozoic rocks of the region record paleogeographic transitions between continental shelf depositional environments on the east and deeper-water slope-facies depositional environments on the west. Middle Devonian and Mississippian sequences, ... continued below

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19 p.

Creation Information

Cole, J. C. October 23, 1998.

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  • Geological Survey (U.S.)
    Publisher Info: United States Geological Survey - Nevada, Las Vegas, NV (United States)
    Place of Publication: Las Vegas, Nevada

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Description

The lateral and vertical distributions of Proterozoic and Paleozoic sedimentary rocks in southern Nevada are the combined products of original stratigraphic relationships and post-depositional faults and folds. This map compilation shows the distribution of the pre-Tertiary rocks in the region including and surrounding the Nevada Test Site. It is based on considerable new evidence from detailed geologic mapping, biostratigraphic control, sedimentological analysis, and a review of regional map relationships. Proterozoic and Paleozoic rocks of the region record paleogeographic transitions between continental shelf depositional environments on the east and deeper-water slope-facies depositional environments on the west. Middle Devonian and Mississippian sequences, in particular, show strong lateral facies variations caused by contemporaneous changes in the western margin of North America during the Antler orogeny. Sections of rock that were originally deposited in widely separated facies localities presently lie in close proximity. These spatial relationships chiefly result from major east- and southeast-directed thrusts that deformed the region in Permian or later time. Somewhat younger contractional structures are identified within two irregular zones that traverse the region. These folds and thrusts typically verge toward the west and northwest and overprint the relatively simple pattern of the older contractional terranes. Local structural complications are significant near these younger structures due to the opposing vergence and due to irregularities in the previously folded and faulted crustal section. Structural and stratigraphic discontinuities are identified on opposing sides of two north-trending fault zones in the central part of the compilation region north of Yucca Flat. The origin and significance of these zones are enigmatic because they are largely covered b Tertiary and younger deposits. These faults most likely results from significant lateral offset, most likely in the sinistral sense. Low-angle normal faults that are at least older than Oligocene, and may pre-date Late Cretaceous time are also present in the region. These faults are shown to locally displace blocks of pre-Tertiary rock by several kilometers. However, none of these structures can be traced for significant distances beyond its outcrop extent, and the inference is made that they do not exert regional influence on the distribution of pre-Tertiary rocks. The extensional strain accommodated by these low-angle normal faults appears to be local and highly irregular. 1 plate

Physical Description

19 p.

Notes

U.S. Geological Survey Information Services, 1-800-435-7627; OSTI as DE00001060

Medium: P; Size: 19 pages

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  • Other Information: PBD: 23 Oct 1998

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  • Report No.: USGS OFR 97-533
  • Grant Number: AI08-96NV11967
  • DOI: 10.2172/1060 | External Link
  • Office of Scientific & Technical Information Report Number: 1060
  • Archival Resource Key: ark:/67531/metadc619627

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • October 23, 1998

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • April 7, 2017, 6:52 p.m.

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Cole, J. C. Major structural controls on the distribution of pre-Tertiary rocks, Nevada Test Site vicinity, southern Nevada, report, October 23, 1998; Las Vegas, Nevada. (digital.library.unt.edu/ark:/67531/metadc619627/: accessed November 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.