COMPARATIVE ANALYSIS OF THE SIERRA NEVADA, MOJAVE/SALINIAN, AND THE PENINSULAR RANGE BATHOLITHS
Utilizing seismic techniques that isolate P-to-s converted phases, we investigated the composition, fabric, and structure of each batholith and relate the seismic attributes to specific processes of batholith root removal and subsequent extensional tectonics. Results from both the southern Sierra Nevada and northern Peninsular Ranges show a large-amplitude Moho converted phase consistent with a sharp boundary, which may have resulted from root removal. Similarities in crustal structures between these two regions may reflect the comparable tectonic histories of each batholith and their relations to adjacent extensional provinces. Differently, portions of the Mojave terrane are characterized by extremely complex seismic signals that may be diagnostic of anisotropy resulting from an underlying subducted and accreted schist terrane. While it appears that similar crustal structures suggest similar tectonic development of both the Peninsular Range and Sierran batholiths, the different appearance of the Mojave province suggest that it has undergone a significantly different tectonic history.