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Geologic Map of the San Emigdio Mountains, Southern California

Chapman, Alan D. and Saleeby, Jason B. (2012) Geologic Map of the San Emigdio Mountains, Southern California. In: Geologic Map of the San Emigdio Mountains, Southern California. Map and chart series (Geological Society of America). No.MCH101. Geological Society of America , Boulder, CO, pp. 1-3.

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New and existing geologic mapping and geochronology of the San Emigdio Mountains are compiled in a 1:40,000 scale map, establishing the framework for recently published and ongoing studies of Cretaceous assemblages belonging to the Sierra Nevada batholith and the Late Cretaceous San Emigdio Schist. Basement exposures of the San Emigdio Mountains are subdivided into four principal fault-bounded assemblages: (1) mid- to Late Cretaceous shallow-level granitoids and Paleozoic to Mesozoic metamorphic pendant rocks of the Pastoria plate; (2) Early to mid-Cretaceous deep-level intrusives of the Tehachapi-San Emigdio complex; (3) mid-to Late Jurassic gabbro, tonalite, ultramafic rocks, and framework basalts of the Western San Emigdio mafic complex; and (4) the Late Cretaceous San Emigdio Schist. The field relations summarized here, when viewed in a regional context, constrain the lateral extent of major Laramide detachment systems (the Pastoria and Rand faults) that were active during Late Cretaceous extensional collapse of the southern Sierra Nevada batholith and adjacent Mojave Desert area and document a highly dismembered and deeply exhumed ancient flat slab system.

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Additional Information:© 2012 Geological Society of America. Manuscript accepted by the Society 6 October 2011. This work, representing the fieldwork component of the Ph.D. thesis of Alan D. Chapman, was made possible by the Wind Wolves Preserve of the Wildlands Conservancy. In particular, we express our profound appreciation for the assistance and friendship of Sherryl and David Clendenen, who, despite being faced with the mountainous task of operating the largest nonprofit preserve on the West Coast, always took the time to help. Dan York, associate director at the Wildlands Conservancy, and countless rangers and ecologists are also thanked for their ongoing support of, enthusiasm for, and curiosity surrounding this work. This map benefited greatly from a thoughtful review by John Wakabayashi. This research was supported by National Science Foundation grant EAR-0739071 and by the Gordon and Betty Moore Foundation. This is Caltech Tectonics Observatory Contribution 181.
Group:Caltech Tectonics Observatory
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Gordon and Betty Moore FoundationUNSPECIFIED
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Other Numbering System NameOther Numbering System ID
Caltech Tectonics Observatory181
Series Name:Map and chart series (Geological Society of America)
Issue or Number:MCH101
Record Number:CaltechAUTHORS:20160624-104349550
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:68656
Deposited By: Tony Diaz
Deposited On:24 Jun 2016 19:49
Last Modified:08 Jun 2020 14:14

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