期刊
TERRA NOVA
卷 24, 期 4, 页码 283-294出版社
WILEY
DOI: 10.1111/j.1365-3121.2012.01061.x
关键词
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资金
- Ministerio de Ciencia e Innovacion [CGL2007-65338-CO2-01/BTE]
Terra Nova, 24, 283294, 2012 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 496484 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 IapetusTornquist Ocean, accreted to a dissected arc during or before the early stages in the opening of the Rheic Ocean.
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