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Geology; March 1993; v. 21; no. 3; p. 267-270; DOI: 10.1130/0091-7613(1993)021<0267:ROSPIF>2.3.CO;2
© 1993 Geological Society of America
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Role of seismogenic processes in fault-rock development: An example from Death Valley, California

Terry L. Pavlis1, Laura F. Serpa1 and Charles Keener1

1 Department of Geology and Geophysics, University of New Orleans, New Orleans, Louisiana 70148

Fault rocks developed along the Mormon Point turtleback of southern Death Valley suggest that a jog in the oblique-slip Death Valley fault zone served as an ancient seismic barrier, where dominantly strike-slip ruptures were terminated at a dilatant jog. Dramatic spatial variations in fault-rock thickness and type within the bend are interpreted as the products of: (1) fault "overshoot," in which planar ruptures bypass the intersection of the two faults composing the bend and slice into the underlying footwall; and (2) implosion brecciation, in which coseismic ruptures arrested at a releasing bend in the fault lead to catastrophic collapse brecciation, fluid influx, and mineralization.




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