This paper uses detailed geologic mapping and paleomagnetic methods to investigate the relationship between vertical-axis rotation and large-magnitude extension in the central Mojave metamorphic core complex (CMMCC). Geologic mapping of the Pickhandle Formation in the Waterman Hills suggests that the area underwent early-Miocene volcanism, alluvial deposition, and intermittent lacustrine ponding. Stratigraphy is steeply tilted or overturned with decreasing dip up section. Tilting and normal faulting found in the mapped area are consistent with northeast-directed extension. Several volcanic intrusions are found in the mapped area and intruded through the footwall and hanging wall of the CMMCC during extension. The nearby Harper Lake Fault has caused strike-slip overprinting of early-Miocene extensional features. Paleomagnetic samples were collected from Mt. General and the Waterman Hills. Samples collected in the Waterman Hills have been significantly altered and yielded inconclusive results. Samples from Mt. General yielded rotation amounts of 20° clockwise. This rotation is most likely a result of drag folding from the nearby Mt. General Fault.
|Advisor:||Onderdonk, Nathan W.|
|Commitee:||Holk, Gregory, Kelty, Tom|
|School:||California State University, Long Beach|
|School Location:||United States -- California|
|Source:||MAI 56/02M(E), Masters Abstracts International|
|Keywords:||California, Extension, Metamorphic core complex, Miocene, Mojave, Rotation, Waterman Hills|
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