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Shear heating not a cause of inverted metamorphism

Kidder, Steven B. and Herman, Frédéric and Saleeby, Jason and Avouac, Jean-Philippe and Ducea, Mihai N. and Chapman, Alan (2013) Shear heating not a cause of inverted metamorphism. Geology, 41 (8). pp. 899-902. ISSN 0091-7613. doi:10.1130/G34289.1.

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An archetypal example of inverted metamorphism purportedly resulting from shear heating is found in the Pelona Schist of southern California (United States). Recent studies demonstrate that the Pelona Schist was subducted and accreted at the onset of Laramide fl at subduction under thermal and kinematic conditions not considered in earlier numerical models. To test the shear heating hypothesis under these conditions, we constructed a thermokinematic model of flat subduction initiation involving continuous accretion of the schist. A neighborhood algorithm inversion demonstrates that available metamorphic and thermochronologic constraints in the Sierra Pelona mountains are satisfied only if accretion rates were 0.2–3.6 km/m.y and shear heating was minimal (shear stress 0–19 MPa). Minimal shear heating is also consistent with an inversion of models constrained by thermochronology of the East Fork (of the San Gabriel River) exposure of the schist. Shear heating inhibits the formation of modeled inverted gradients during accretion and should not be considered an important factor in their generation.

Item Type:Article
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URLURL TypeDescription
Avouac, Jean-Philippe0000-0002-3060-8442
Ducea, Mihai N.0000-0002-5322-0782
Additional Information:© 2013 Geological Society of America. Manuscript received 6 December 2012; Revised manuscript received 2 April 2013; Manuscript accepted 3 April 2013. First published online June 20, 2013. We benefited from comments by J. Stock, J. Scott, and reviews by John Platt, Pavel Pitra, Marcel Frehner, and an anonymous reviewer. The Gordon and Betty Moore Foundation via Caltech’s Tectonics Observatory provided financial support. Computations were performed on the Pangu facility at Caltech. This is Caltech Tectonics Observatory contribution 226.
Group:Caltech Tectonics Observatory , Seismological Laboratory
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Gordon and Betty Moore FoundationUNSPECIFIED
Caltech Tectonics ObservatoryUNSPECIFIED
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Other Numbering System NameOther Numbering System ID
Caltech Tectonics Observatory 226
Issue or Number:8
Record Number:CaltechAUTHORS:20130923-105214527
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:41478
Deposited By: Tony Diaz
Deposited On:23 Sep 2013 18:17
Last Modified:10 Nov 2021 04:30

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