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How does the continental crust thin in a hyperextended rifted margin? Insights from the Iberia margin

Emilie Sutra and Gianreto Manatschal
How does the continental crust thin in a hyperextended rifted margin? Insights from the Iberia margin
Geology (Boulder) (January 2012) 40 (2): 139-142

Abstract

The discovery of hyperthinned continental crust and exhumed mantle on present-day deep-water rifted margins leads to two fundamental questions: (1) in detail, how does the crust thin in extension, and (2) what controls extreme crustal thinning and mantle exhumation? Reflection and refraction seismic lines across the Iberian margin show decoupling levels in the crust cut by structures that eventually transfer deformation to mantle levels. The region of decoupled extension appears to be more broadly distributed on the northern Iberian margin and more localized on the southern margin. Based on drill hole data, the transition from decoupled to coupled deformation occurred during Tithonian time (ca. 145 Ma). This evolution from decoupled to coupled deformation may help explain the crustal architecture of the Iberian margin. An apparent delay of subsidence across the hyperextended coupled zone of the Iberian margin may indicate that crustal thinning had to occur simultaneously with lithospheric necking and the advection of heat related to lithospheric mantle thinning.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 40
Serial Issue: 2
Title: How does the continental crust thin in a hyperextended rifted margin? Insights from the Iberia margin
Affiliation: Universite de Strasbourg, Institut de Physique du Globe de Strasbourg-Ecole et Observatoire des Sciences de la Terre, Strasbourg, France
Pages: 139-142
Published: 20120106
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 27
Accession Number: 2012-018494
Categories: Solid-earth geophysicsApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2012039
Illustration Description: illus. incl. sects., sketch map
N39°00'00" - N43°00'00", W15°00'00" - W09°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201210
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