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A new type of decollement thrusting

Burchfiel, B. Clark and Wernicke, Brian and Willemin, James H. and Axen, Garry J. and Cameront, C. Scott (1982) A new type of decollement thrusting. Nature, 300 (5892). pp. 513-515. ISSN 0028-0836. doi:10.1038/300513a0.

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One of the fundamental rules of decollement tectonics is that decollement horizons form in mechanically weak layers. Here we document two examples of decollement-style thrust faults that detach within thick platformal dolostones in preference to apparently weaker layers of shale, siltstone and limestone underlying the dolostones. The thrusts are the Keystone–Muddy Mountain–Glendale thrust system (the KMG thrust system), , and the underlying Contact–Red Spring–North Buffiington–Mormon thrust system (the CRM thrust system), both of southern Nevada. They form part of the Sevier orogenic belt, and extend for roughly 250km along strike, together showing at least 65 km tectonic overlap (Fig. 1). Although the thrust systems are closely related spatially, the higher KMG system is younger than the underlying CRM thrust system, and the two developed essentially independently. Three points are important: first, that both the KMG and the CRM thrust systems are decollement style thrusts; second, that the decollement horizon is primarily restricted to a narrow stratigraphical interval within a bedded sequence of essentially homogeneous dolostones of the Middle Cambrian Bonanza King Formation; the third, that the thrust faults formed at a very shallow crustal level (<5 km).

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Wernicke, Brian0000-0002-7659-8358
Additional Information:© 1982 Macmillan Journals Ltd. Received 28 June; accepted 24 September 1982. This research has been supported by the NSF, the US Geological Survey, Chevron USA, Mobil Oil Corporation, the Geological Society of America, and the Fannie and John Hertz Foundation.
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Mobil Oil CorporationUNSPECIFIED
Geological Society of AmericaUNSPECIFIED
Fannie and John Hertz FoundationUNSPECIFIED
Issue or Number:5892
Record Number:CaltechAUTHORS:20140716-104344077
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:47262
Deposited By: Tony Diaz
Deposited On:16 Jul 2014 23:38
Last Modified:10 Nov 2021 17:37

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