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Generation of talc in the mantle wedge and its role in subduction dynamics in central Mexico

Kim, YoungHee and Clayton, Robert W. and Asimow, Paul D. and Jackson, Jennifer M. (2013) Generation of talc in the mantle wedge and its role in subduction dynamics in central Mexico. Earth and Planetary Science Letters, 384 . pp. 81-87. ISSN 0012-821X. http://resolver.caltech.edu/CaltechAUTHORS:20140116-090617911

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Abstract

Geophysical evidence shows the presence of low-seismic velocity material at the surface of slabs in subduction zones. In the central Mexican subduction zone this appears as a thin (∼4 km) low-velocity zone that absorbs nearly all of the strain. The P-to-S velocity ratio as a function of S wave velocity distinguishes among the various candidate hydrous (low-strength) minerals; the thin layer in the flat-slab region is most consistent with a layer showing enrichment in talc overlying normal MORB-like gabbro. Based on available thermodynamic data for equilibria for talc, its generation at the trench is nearly impossible, and hence we propose it originates from the mantle wedge during the slab flattening process coupled with trench rollback. The evolution of this low-strength zone has important implications for the dynamics of the slab-flattening process as well as the geochemistry of the mantle wedge and arc in central Mexico.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.epsl.2013.10.006DOIArticle
http://www.sciencedirect.com/science/article/pii/S0012821X13005694PublisherArticle
ORCID:
AuthorORCID
Clayton, Robert W.0000-0003-3323-3508
Asimow, Paul D.0000-0001-6025-8925
Additional Information:© 2013 Elsevier B.V. Received 13 August 2013; Received in revised form 3 October 2013; Accepted 4 October 2013; Available online 27 October 2013. Editor: P. Shearer This work was funded by the Korea Meteorological Administration Research and Development Program under Grant CATER-2013-8010. This study was also supported by the Gordon and Betty Moore Foundation through the Tectonics Observatory at California Institute of Technology (Contribution number 223) and NSF award EAR 0609707. We used Excel Worksheets and Macros from Hacker and Abers (2004) for calculating seismic speeds. We thank Xyoli Perez-Campos, Arturo Iglesias, and others at the Universidad Nacional Autonoma de Mexico for deploying and maintaining the MASE line. We also thank Joann Stock and Michael Gurnis from California Institute of Technology for discussions. Finally, we thank Editor Peter Shearer, Pascal Audet, and one anonymous reviewer for helpful comments which improved the manuscript.
Group:Caltech Tectonics Observatory, Seismological Laboratory
Funders:
Funding AgencyGrant Number
Korea Meteorological Administration Research and Development ProgramCATER-2013-8010
Gordon and Betty Moore Foundation UNSPECIFIED
Caltech Tectonics ObservatoryUNSPECIFIED
NSFEAR 0609707
Subject Keywords:subduction; talc; serpentine; receiver function; mantle wedge; P-to-S velocity ratio
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Tectonics Observatory223
Record Number:CaltechAUTHORS:20140116-090617911
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140116-090617911
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43400
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:16 Jan 2014 22:58
Last Modified:31 Jan 2017 20:45

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