Journal
COMPTES RENDUS GEOSCIENCE
Volume 338, Issue 16, Pages 1260-1267Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.crte.2006.08.001
Keywords
Variscan Belt; Ossa-Morena Zone; HP-LT metamorphism; Fe3+; local equilibria's thermobarometry; Spain
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Multi-equilibrium thermobarometry shows that low-grade metapelites (Cubito-Moura schists) from the Ossa-Morena Zone underwent HP-LT metamorphism from 340-370 degrees C at 1.0-0.9 GPa to 400-450 degrees 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 (SI) in these rocks. The main foliation in the schists is a crenulation cleavage (S-2), which developed during decompression from 0.8-0.7 to 0.4-0.3 GPa at increasing temperatures from 400-450 degrees C to 440-465 degrees C. Fe3+ in chlorite decreased greatly during prograde metamorphism from molar fractions of 0.4 determined in syn-S-1 chlorites down to 0.1 in syn-S-2 chlorites. These new data add to previous findings of eclogites in the Moura schists indicating that a pile of allochtonous
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