See more from this Division: General Discipline Sessions
See more from this Session: Structural Geology / Tectonics / Neotectonics/Paleoseismology II
Abstract:
Structure contours delimit discrete domains of motion. Kinematic indicators along the basal surfaces show motion most recently took place in a down dip direction. Apatite fission-track analysis shows exhumation of the range began around 23 - 17 Ma in a distributed fashion. The amount of material preserved in the hanging wall of the main low-angle fault in the range is a minimum of 10.9 km3, small compared with the size of the range. Restoration of predicted exhumation reveals no large-magnitude extension between the Mormon Mountains and surrounding ranges. Low angle detachments are temporally restricted to intervals between movement events on high-angle faults.
These criteria suggest the Mormon Peak detachment is a product of gravity sliding and may help future workers in other areas distinguish between rooted structures that accommodate crustal extension and rootless structures that do not.
See more from this Division: General Discipline Sessions
See more from this Session: Structural Geology / Tectonics / Neotectonics/Paleoseismology II