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Superposed fold-thrust events at the Nevada Test Site

GSA Field Guides

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DOI: 10.1130/0-8137-0002-7.337

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Abstract

The Nevada Test Site (NTS), in southern Nye County, Nevada, straddles significant pre-Tertiary structural and stratigraphic boundaries. Detailed stratigraphy and biostratigraphy of the Upper Paleozoic section delineates the regional trust sheets and constrains their burial histories. The Paleozoic rocks record three phases of contractional deformation, overprinted by strike-slip faulting. These occured in the folloing order: (1) foreland-vergant folding and imbricate thrusting in the footwall of the Belted Range thrust; (2) hinterland-vergent folding and thrusting; and (3) north-vergant folding that we interpret as footwall deformation below a third major thrust system. Sinistral slip, typically accompanied by minor east-west shortening, has occured along a series of north-northeast--north-northwest--striking faults around Yucca Flat. This strike-slip faulting postdates both foreland-vergent and hinterland-vergent deformation, and predates the Cretaceous Climax stock; its age relative to the north-vergent folding and thrusting is unknown. Our new understanding of the geometry of these structures provides new insights into the correlation and interpretation of regional structural features. Field trip stops will examine: (1) the stratigraphic differences that allow us to distinguish the regional thrust sheets and constrain their burial histories; and (2) the field relationships that document the kinematics and relative ages of the penetrative deformational events.

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Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Superposed fold-thrust events at the Nevada Test Site
Series title:
GSA Field Guides
DOI:
10.1130/0-8137-0002-7.337
Volume
2
Year Published:
2000
Language:
English
Publisher:
Geological Society of America
Contributing office(s):
Geosciences and Environmental Change Science Center
Description:
18 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
GSA Field Guides
First page:
337
Last page:
354
Country:
United States
State:
Nevada
County:
Nye County