Publication: The Bazar Ophiolite of NW Iberia: a relic of the Iapetus–Tornquist
Ocean in the Variscan suture
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Publication Date
2012
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Blackwell Publishing Ltd
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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.