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Reconstructing Farallon plate subduction beneath North America back to the Late Cretaceous

Liu, Lijun and Spasojevic, Sonja and Gurnis, Michael (2008) Reconstructing Farallon plate subduction beneath North America back to the Late Cretaceous. Science, 322 (5903). pp. 934-938. ISSN 0036-8075. http://resolver.caltech.edu/CaltechAUTHORS:20140214-141553000

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Abstract

Using an inverse mantle convection model that assimilates seismic structure and plate motions, we reconstruct Farallon plate subduction back to 100 million years ago. Models consistent with stratigraphy constrain the depth dependence of mantle viscosity and buoyancy, requiring that the Farallon slab was flat lying in the Late Cretaceous, consistent with geological reconstructions. The simulation predicts that an extensive zone of shallow- dipping subduction extended beyond the flat-lying slab farther east and north by up to 1000 kilometers. The limited region of flat subduction is consistent with the notion that subduction of an oceanic plateau caused the slab to flatten. The results imply that seismic images of the current mantle provide more constraints on past tectonic events than previously recognized.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1126/science.1162921DOIArticle
http://www.sciencemag.org/cgi/content/abstract/322/5903/934PublisherArticle
http://www.sciencemag.org/cgi/content/full/322/5903/934/DC1PublisherSupplemental material
Additional Information:© 2008 American Association for the Advancement of Science. 8 July 2008; accepted 8 October 2008. This is contribution no. TO 88 of the Caltech Tectonics Observatory. The work was partially supported by the Gordon and Betty Moore Foundation through the Tectonics Observatory and the NSF through EAR-0609707. We appreciate discussions with J. Saleeby and R. D. Müller. The original CitcomS software was obtained from the Computational Infrastructure for Geodynamics (CIG) (http://geodynamics.org).
Group:Caltech Tectonics Observatory, Seismological Laboratory
Funders:
Funding AgencyGrant Number
Gordon and Betty Moore FoundationUNSPECIFIED
NSFEAR-0609707
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Caltech Tectonics Observatory88
Record Number:CaltechAUTHORS:20140214-141553000
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140214-141553000
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43842
Collection:CaltechAUTHORS
Deposited By: Katherine Johnson
Deposited On:14 Feb 2014 22:22
Last Modified:11 Jun 2015 12:59

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