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Fabric Development in a Middle Devonian Intraoceanic Subduction Regime: The Careón Ophiolite (Northwest Spain)

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Gómez Barreiro, Juan and Martínez Catalán, José Ramón and Prior, D. and Wenk, H.-R. and Vogel, S. and Díaz García, Florentino and Arenas Martín, Ricardo and Sánchez Martínez, Sonia and Lonardelli, I. (2010) Fabric Development in a Middle Devonian Intraoceanic Subduction Regime: The Careón Ophiolite (Northwest Spain). The Journal of geology, 118 . pp. 163-186. ISSN 0022-1376

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Official URL: http://www.press.uchicago.edu/ucp/journals/journal/jg.html



Abstract

A Middle Devonian suprasubduction zone ophiolite, the Careo´n Unit (northwest Spain), displays amphibolite-facies
ductile deformation fabrics related to the onset of the Rheic Ocean closure. Two different fabrics, an early high-T
foliation and a subsequent lower-T foliation, each of which characterized by distinct deformation mechanisms, have
been identified in two distinct crustal-scale shear zones of the same ophiolitic thrust sheet. Combined quantitative
texture analysis by electron backscattered diffraction and time-of-flight neutron diffraction, were carried out on the
shear zones and correlated with micro- and macrostructural data. The results indicate that the regional lineation and
shear zone kinematics (east-west, top-to-the-east) represent fabrics developed essentially during the intraoceanic
subduction of the Rheic Ocean, and their orientation may be considered a reference vector for convergence models
in this part of the Variscan belt.


Item Type:Article
Uncontrolled Keywords:Careón Ophiolite; Middle Devonian; Intraoceanic subduction
Subjects:Sciences > Geology > Petrology
ID Code:17407
Deposited On:12 Dec 2012 12:31
Last Modified:12 Dec 2012 12:31

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