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Publication Detail
Simultaneous extensional exhumation across the Alboran Basin: Implications for the causes of late orogenic extension
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Journal Article
  • Authors:
    Platt JP, Whitehouse MJ, Kelley SP, Carter A, Hollick L
  • Publication date:
    01/03/2003
  • Pagination:
    251, 254
  • Journal:
    Geology
  • Volume:
    31
  • Issue:
    3
  • Status:
    Published
  • Print ISSN:
    0091-7613
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 km2, and took place ∼25 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 modelling 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 exhumation to produce the high-grade metamorphic event.
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