HP–LT Variscan metamorphism in the Cubito-Moura schists (Ossa-Morena Zone, southern Iberia) |
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| Authors: | Guillermo Booth-Rea Jos Fernando Simancas Antonio Azor Jos Miguel Azan Francisco Gonzlez-Lodeiro Paulo Fonseca |
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| Institution: | aDepartamento de Geodinámica, Universidad de Granada, 18071 Granada, Spain;bDepartamento de Geologia, FCUL, Ed. C2, 5o Piso, Campo Grande, 1700 Lisboa, Portugal |
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| Abstract: | Multi-equilibrium thermobarometry shows that low-grade metapelites (Cubito-Moura schists) from the Ossa–Morena Zone underwent HP–LT metamorphism from 340–370 °C at 1.0–0.9 GPa to 400–450 °C at 0.8–0.7 GPa. These HP–LT equilibriums were reached by parageneses including white K mica, chlorite and chloritoid, which define the earliest schistosity (S1) in these rocks. The main foliation in the schists is a crenulation cleavage (S2), which developed during decompression from 0.8–0.7 to 0.4–0.3 GPa at increasing temperatures from 400–450 °C to 440–465 °C. Fe3+ in chlorite decreased greatly during prograde metamorphism from molar fractions of 0.4 determined in syn-S1 chlorites down to 0.1 in syn-S2 chlorites. These new data add to previous findings of eclogites in the Moura schists indicating that a pile of allochtonous rocks situated next to the Beja-Acebuches oceanic amphibolites underwent HP–LT metamorphism during the Variscan orogeny. To cite this article: G. Booth-Rea et al., C. R. Geoscience 338 (2006). |
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| Keywords: | Variscan Belt Ossa-Morena Zone HP– LT metamorphism Fe3+ Local equilibria's thermobarometry SpainMots-clé s: Chaî ne Varisque Zone d'Ossa-Morena Mé tamorphisme HP– BT Fe3+ Thermobaromé trie des é quilibres locaux Espagne |
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