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Simultaneous extensional exhumation across the Alboran Basin: Implications for the causes of late orogenic extension

Platt, J.P.; Whitehouse, M.J; Kelley, S.P; Carter, A. and Hollick, L. (2003). Simultaneous extensional exhumation across the Alboran Basin: Implications for the causes of late orogenic extension. Geology, 31(3) pp. 251–254.

URL: http://www.gsajournals.org/gsaonline/?request=get-...
DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1130/0091-7613(2003)031%3C0251:SEEATA%3E2.0.CO;2
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Abstract

Large-scale crustal thinning of the Alpine orogen in the westernmost Mediterranean (Alboran Sea and surrounding regions) was rapid, simultaneous over an area of 60,000 km(2), and took place similar to25 m.y. after the main crustal thickening event. Crustal thinning, which locally exposed subcontinental mantle, was accompanied by high-grade metamorphism and partial melting. Both U-Pb dating of zircon and thermal modeling of cooling histories indicate that the thermal peak was reached between 23 and 21 Ma over the entire region. Final exhumation and cooling followed immediately. Possible explanations for this dramatic late orogenic extension include subduction rollback, slab detachment, lithospheric delamination, and convective removal of subcontinental lithosphere. Of these processes, only convective removal of subcontinental lithosphere predicts a significant time lapse between crustal thickening and the onset of extension, the simultaneity of extension over the whole region, and heating of rock during rapid exhumation to produce the high-grade metamorphic event.

Item Type: Journal Article
ISSN: 0091-7613
Keywords: metamorphism, geochronology; zircon; Alboran Sea; Betic Cordillera; Rif
Academic Unit/Department: Science > Environment, Earth and Ecosystems
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 2116
Depositing User: Simon Kelley
Date Deposited: 05 Jun 2006
Last Modified: 02 Dec 2010 19:46
URI: http://oro.open.ac.uk/id/eprint/2116
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