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Are subduction zones invading the Atlantic; evidence from the southwest Iberia margin

Joao C. Duarte, Filipe M. Rosas, Pedro Terrinha, Wouter P. Schellart, David Boutelier, Marc-Andre Gutscher and Antonio Ribeiro
Are subduction zones invading the Atlantic; evidence from the southwest Iberia margin
Geology (Boulder) (June 2013) 41 (8): 839-842

Abstract

Subduction initiation at passive margins plays a central role in the plate tectonics theory. However, the process by which a passive margin becomes active is not well understood. In this paper we use the southwest Iberia margin (SIM) in the Atlantic Ocean to study the process of passive margin reactivation. Currently there are two tectonic mechanisms operating in the SIM: migration of the Gibraltar Arc and Africa-Eurasia convergence. Based on a new tectonic map, we propose that a new subduction zone is forming at the SIM as a result of both propagation of compressive stresses from the Gibraltar Arc and stresses related to the large-scale Africa-Eurasia convergence. The Gibraltar Arc and the SIM appear to be connected and have the potential to develop into a new eastern Atlantic subduction system. Our work suggests that the formation of new subduction zones in Atlantic-type oceans may not require the spontaneous foundering of its passive margins. Instead, subduction can be seen as an invasive process that propagates from ocean to ocean.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 41
Serial Issue: 8
Title: Are subduction zones invading the Atlantic; evidence from the southwest Iberia margin
Affiliation: Monash University, School of Geosciences, Melbourne, Victoria, Australia
Pages: 839-842
Published: 20130606
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 22
Accession Number: 2013-054276
Categories: Solid-earth geophysics
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2013235
Illustration Description: illus. incl. sect., geol. sketch map
N36°00'00" - N43°49'60", W09°30'00" - E03°19'60"
Secondary Affiliation: Universidade de Lisboa, PRT, PortugalUniversity of Brest, FRA, France
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: 201333
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