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Geology; March 2007; v. 35; no. 3; p. 259-262; DOI: 10.1130/G23396A.1
© 2007 Geological Society of America
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Kinematic evidence for downdip movement on the Mormon Peak detachment

Christopher D. Walker*,1, Mark H. Anders1 and Nicholas Christie-Blick1

1 Department of Earth and Environmental Sciences and Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York 10964, USA

The Mormon Peak detachment is considered to be one of the best examples of a rooted upper crustal detachment fault that propagated through the brittle crust at a low angle. The hanging wall of the detachment today consists of a number of isolated blocks that have been interpreted as remnants of a once-contiguous extensional allochthon. Here we present the results of a new study of directional indicators from the basal surfaces beneath these blocks. These measurements do not agree with the long-standing interpretation of a S75°W movement direction for the detachment hanging wall. Instead, the most recent movement on each section of the detachment took place approximately parallel to the present downdip direction. We conclude that the Mormon Peak detachment is best explained as the basal surfaces to a series of rootless gravity slides.

Key Words: detachment faults • Basin and Range Province • gravity sliding • Mormon Peak detachment • crustal extension




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