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Shear heating not a cause of inverted metamorphism

Steven B. Kidder, Frederic Herman, Jason B. Saleeby, Jean-Philippe Avouac, Mihai N. Ducea and Alan Chapman
Shear heating not a cause of inverted metamorphism
Geology (Boulder) (June 2013) 41 (8): 899-902


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 flat subduction under thermal and kinematic conditions not considered in earlier numerical models. To test the shear heating hypothesis under these conditions, we constructed a thermo-kinematic 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.

ISSN: 0091-7613
EISSN: 1943-2682
Serial Title: Geology (Boulder)
Serial Volume: 41
Serial Issue: 8
Title: Shear heating not a cause of inverted metamorphism
Affiliation: California Institute of Technology, Pasadena, CA, United States
Pages: 899-902
Published: 20130620
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 29
Accession Number: 2013-054378
Categories: Igneous and metamorphic petrologyStructural geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2013247
Illustration Description: illus. incl. 2 tables, geol. sketch map
N34°10'00" - N34°30'00", W118°25'00" - W117°19'60"
Secondary Affiliation: Universite de Lausanne, CHE, SwitzerlandUniversity of Arizona, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201333
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