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    Exhumation history of the Andean broken foreland revisited

    Davila, F.M. and Carter, Andrew (2013) Exhumation history of the Andean broken foreland revisited. Geology 41 (4), pp. 443-446. ISSN 0091-7613.

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    Abstract

    The Andean broken foreland in west-central Argentina, located 400–800 km from the Peru-Chile Trench, is associated with flat subduction linked to collision of the oceanic Juan Fernandez Ridge. While the conditions associated with flat subduction would be expected to produce increases in rock uplift and exhumation, where thrusting and dynamic forces work together, a prevalence of pre-Cenozoic apatite fission track (AFT) cooling ages suggests that there is no such link. The lack of Cenozoic cooling ages is at odds with structural reconstructions and basin studies along the foreland that show several kilometers of exhumation. This paradox can be reconciled by taking into account the thermal effects of flat subduction that removed the mantle wedge, and a significant source of heat flow into the crust. Reinterpretation of published AFT exhumation data (>320 ages) using more realistic lower geothermal gradient values allows for substantial exhumation and explains the lack of Cenozoic exhumation ages across the foreland region.

    Metadata

    Item Type: Article
    School: School of Science > Earth and Planetary Sciences > UCL/Birkbeck Centre for Planetary Sciences
    Depositing User: Administrator
    Date Deposited: 30 Sep 2013 11:52
    Last Modified: 11 Oct 2016 11:55
    URI: https://eprints.bbk.ac.uk/id/eprint/8285

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