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1 Department of Geological Sciences, San Diego State University, San Diego, California 92182-1020, USA
2 Earth Systems Science & Policy Institute, California State University Monterey Bay, Seaside, California 93955-8001, USA
3 Department of Geology, University of Wisconsin, Eau Claire, Wisconsin 54702, USA
4 U.S. Geological Survey, Menlo Park, California 94025, USA
5 Department of Earth & Space Sciences, University of California, Los Angeles, California 90095, USA
8 Department of Geological Sciences, San Diego State University, San Diego, California 92182-1020, USA
6 Instituto de Geologia, Campus Universidad Nacional Autónoma de México–Juriquilla, Querétaro 76000, Mexico
7 Australian National University, Canberra, ACT 2601, Australia
The eastern Peninsular Ranges batholith is dominated by voluminous La Posta–type tonalite-granodiorite intrusions that compose half of the magmatic arc at present erosion level. Zircon U-Pb and hornblende 40Ar/39Ar results from these intrusions indicate that they were emplaced in a remarkably narrow interval (99–92 Ma) that closely followed cessation of west-directed compression of the arc system. Emplacement of the La Posta suite coincided with a major pulse of coarse-grained sediment into the adjacent forearc basin in early Cenomanian to middle Turonian time. Paleontologic control, and plutonic age and detrital zircon U-Pb data demonstrate the virtual absence of a time lag between magma emplacement and sedimentary response. The tight linkage between magmatism, arc exhumation, and sediment delivery to the forearc indicates that development of major erosional topography in the arc was driven by thermal and mechanical effects associated with large-volume batholith emplacement.
Key Words: forearc basin • batholith • Peninsular Ranges • geochronology
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