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Topographic response to mantle lithosphere removal in the southern Sierra Nevada region, California

Saleeby, Jason and Foster, Zorka (2004) Topographic response to mantle lithosphere removal in the southern Sierra Nevada region, California. Geology, 32 (3). pp. 245-248. ISSN 0091-7613.

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Geological studies of mantle xenoliths entrained in late Neogene–Quaternary lavas from the southern Sierra Nevada region and regional geophysical studies suggest that the high-density mantle lithosphere that formed beneath the Sierra Nevada batholith in conjunction with arc magmatism is being convectively removed as a “drip” structure. This structure, as imaged seismically, is roughly cylindrical in shape with a diameter of ~100 km, and extends to ~225 km depth. Centered above this structure is a region ~120 km in diameter that is undergoing active subsidence relative to adjacent regions. Such subsidence is seen in the active fluvial-alluvial sediment flooding of mountainous topography of the southwestern Sierra and in the development of the adjacent Tulare Lake basin of the San Joaquin Valley. Dynamic modeling of such upper-mantle drip structures predicts a phase of overlying surface subsidence during the most vigorous phase of drip formation. The southern Sierra upper mantle drip and the overlying crust appear to be in this phase of their dynamically coupled evolution.

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Additional Information:© 2004 Geological Society of America. Manuscript received 8 July 2003. Revised manuscript received 17 November 2003. Manuscript accepted 18 November 2003. This research was supported by National Science Foundation grant EAR-0087347 and the Gordon and Betty Moore Foundation. Interactions with Mihai Ducea, Mike Gurnis, George Zandt, Craig Jones, Nadine McQuarrie, Joann Stock, Brian Wernicke, and Diane Clemens-Knott helped stimulate this work. Assistance in geographic information system work by Shaun Healy is gratefully acknowledged.
Group:Caltech Tectonics Observatory
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Gordon and Betty Moore FoundationUNSPECIFIED
Subject Keywords:dynamic topography; mantle drip; basin subsidence
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Caltech Tectonics Observatory25
Issue or Number:3
Record Number:CaltechAUTHORS:20101123-094421945
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:20972
Deposited By: Tony Diaz
Deposited On:07 Dec 2010 00:48
Last Modified:03 Oct 2019 02:17

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