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Simultaneous extensional exhumation across the Alboran Basin; implications for the causes of late orogenic extension

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

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 (super 2) , and took place approximately 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 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.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 31
Serial Issue: 3
Title: Simultaneous extensional exhumation across the Alboran Basin; implications for the causes of late orogenic extension
Affiliation: University College London-Birkbeck, Research School of Earth Sciences, London, United Kingdom
Pages: 251-254
Published: 200303
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 32
Accession Number: 2003-025981
Categories: Structural geologyGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2003024
Illustration Description: illus. incl. sketch map
N36°12'19" - N36°12'19", W04°18'45" - W04°18'45"
Secondary Affiliation: Swedish Museum of Natural History, SWE, SwedenOpen University, GBR, United Kingdom
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200309
Program Name: ODPOcean Drilling Program
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