| Título: | The Bazar Ophiolite of NW Iberia: a relic of the Iapetus–TornquistOcean in the Variscan suture |
| Autores: | Sánchez Martínez, Sonia ; Gerdex, Axel ; Arenas Martín, Ricardo ; Abati Gómez, Jacobo |
| Tipo de documento: | texto impreso |
| Editorial: | Blackwell Publishing Ltd, 2012 |
| Dimensiones: | application/pdf |
| Nota general: | info:eu-repo/semantics/openAccess |
| Idiomas: | |
| Palabras clave: | Estado = Publicado , Materia = Ciencias: Geología: Petrología , Tipo = Artículo |
| Resumen: |
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. |
| En línea: | https://eprints.ucm.es/id/eprint/17452/1/01061-1.pdf |
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