The Sundance fault: A newly recognized shear zone at Yucca Mountain, Nevada

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Description

Ongoing detailed mapping at a scale of 1:240 of structural features within the potential repository area indicates the presence of several previously unrecognized structural features. Minor north-trending west-side-down faults occur east and west of the Ghost Dance fault and suggest a total width of the Ghost Dance fault system of nearly 366 m (1200 ft). A zone of near-vertical N30{degrees} {minus} 40{degrees}W {minus} trending faults, at least 274 m (900 ft) wide, has been identified in the northern part of our study area and may traverse across the proposed repository area. On the basis of a preliminary analysis of available ... continued below

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12 p.

Creation Information

Spengler, R.W.; Braun, C.A.; Martin, L.G. & Weisenberg, C.W. April 1, 1994.

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Description

Ongoing detailed mapping at a scale of 1:240 of structural features within the potential repository area indicates the presence of several previously unrecognized structural features. Minor north-trending west-side-down faults occur east and west of the Ghost Dance fault and suggest a total width of the Ghost Dance fault system of nearly 366 m (1200 ft). A zone of near-vertical N30{degrees} {minus} 40{degrees}W {minus} trending faults, at least 274 m (900 ft) wide, has been identified in the northern part of our study area and may traverse across the proposed repository area. On the basis of a preliminary analysis of available data, we propose to name this zone the ``Sundance fault system`` and the dominant structure, occurring near the middle of the zone, the ``Sundance fault.`` Some field relations suggest left-stepping deflections of north-trending faults along a preexisting northwest-trending structural fabric. Other field observations suggest that the ``Sundance fault system`` offsets the Ghost Dance fault system in an apparent right lateral sense by at least 52 m (170 ft). Additional detailed field studies, however, are needed to better understand structural complexities at Yucca Mountain.

Physical Description

12 p.

Notes

INIS; OSTI as DE94009403

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  • Other Information: PBD: 1994

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  • Other: DE94009403
  • Report No.: USGS-OFR--94-49
  • Grant Number: AI08-92NV10874
  • DOI: 10.2172/145211 | External Link
  • Office of Scientific & Technical Information Report Number: 145211
  • Archival Resource Key: ark:/67531/metadc627987

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Creation Date

  • April 1, 1994

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • April 18, 2016, 7:12 p.m.

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Spengler, R.W.; Braun, C.A.; Martin, L.G. & Weisenberg, C.W. The Sundance fault: A newly recognized shear zone at Yucca Mountain, Nevada, report, April 1, 1994; Denver, Colorado. (digital.library.unt.edu/ark:/67531/metadc627987/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.