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Continental response to active ridge subduction

Haschke, Michael, Sobel, E. R., Blisniuk, P. M., Strecker, M. R. and Warkus, F. 2006. Continental response to active ridge subduction. Geophysical Research Letters 33 (15) , L15315. 10.1029/2006GL025972

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Abstract

[1] Apatite fission track ages from a ∼2000 m elevation transect from the Patagonian fold and thrust belt (47.5°S) allow us to quantify the denudational and orographic response of the upper plate to active ridge subduction. Accelerated cooling started at 17 Ma, predating the onset of ridge collision (14–10 Ma), and was followed by reheating between 10 and 6 Ma. Thermal modeling favors reheating on the order of 60°C at ∼28°C/Ma due to east-migration of a slab window after the ridge-trench collision. Final rapid cooling since 4 Ma of ∼18°C/Ma (geothermal gradient of 14°C/km) correlates with the presence of an orographic barrier and >1 km rock uplift in this region between 17.1 and 6.3 Ma. Increased precipitation and erosion since 4 Ma caused asymmetric exhumation, with 3–4 km on the leeside. Repeated crustal unroofing in response to active ridge subduction can explain the positive gravity anomaly south of the Chile Triple Junction.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Additional Information: Publisher's copyright requirements "Permission to Deposit an Article in an Institutional Repository. Adopted by Council 13 December 2009. AGU allows authors to deposit their journal articles if the version is the final published citable version of record, the AGU copyright statement is clearly visible on the posting, and the posting is made 6 months after official publication by the AGU." See http://www.agu.org/pubs/authors/usage_permissions.shtml
Publisher: American Geophysical Union
ISSN: 0094-8276
Last Modified: 18 Oct 2017 08:53
URI: http://orca-mwe.cf.ac.uk/id/eprint/1256

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