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The Bazar Ophiolite of NW Iberia: a relic of the Iapetus–Tornquist Ocean in the Variscan suture

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Sánchez Martínez, Sonia and Gerdex, Axel and Arenas Martín, Ricardo and Abati Gómez, Jacobo (2012) The Bazar Ophiolite of NW Iberia: a relic of the Iapetus–Tornquist Ocean in the Variscan suture. Terra nova, 24 . pp. 283-294. ISSN 0954-4879

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Official URL: http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-3121/



Abstract

The Bazar Ophiolite, one of the ophiolitic units involved in the
Variscan suture of NW Iberia, is mainly formed by metagabbroic
high T amphibolites with N-MORB affinity. The ophiolite
appears accreted under an arc-derived upper terrane affected
by intermediate-P granulite facies metamorphism dated at 496–
484 Ma. U-Th-Pb geochronology and Lu-Yb-Hf isotope geochemistry
of zircons allow recognizing two growth stages. The
first occurred during crystallization of the gabbroic protolith
and has been dated at 495 ± 2 Ma, whereas the second one,
interpreted as dating the high T metamorphism, yielded an age
of 475 ± 2 Ma. The chronology of the Bazar Ophiolite and its
accretionary history suggest that this unit is a relic of the
Cambrian ocean located to the North of Gondwana, the
Iapetus–Tornquist Ocean, accreted to a dissected arc during
or before the early stages in the opening of the Rheic Ocean.


Item Type:Article
Uncontrolled Keywords:Bazar ophiolite; NW Iberia
Subjects:Sciences > Geology > Petrology
ID Code:17452
Deposited On:14 Dec 2012 11:55
Last Modified:14 Dec 2012 11:55

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