期刊
COMPTES RENDUS GEOSCIENCE
卷 334, 期 11, 页码 857-865出版社
EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/S1631-0713(02)01787-X
关键词
thermobarometry; carpholite; Alpujarrides; southeastern Betics; Spain
We present the first occurrences of high-pressure, low-temperature ferro-magnesiocarpholite-bearing mineral assemblages associated to quartz segregations in the Alpujarride units of southeastern Betics (Sierra de Almagro, Sierra de los Pinos and Sierra Cabrera). Thermobarometric results show that the carpholite-bearing rocks underwent the same P-T conditions in the three outcrops, i.e. 8-10 kbar, 350-400 degreesC. Metamorphic and structural data allow us to conclude that these rocks belong to the same Alpujarride unit. In the Sierra de Almagro, tectonic units with carpholite-bearing rocks overlie low-pressure, low-temperature Alpujarride units, then forming a stack with an inverted tectono-metamorphic sequence, as observed in the central and western part of the Alpujarride complex. The preservation of carpholite-bearing assemblages in these rocks implies that no significant temperature increase occurred during the exhumation history. (C) 2002 Academie des sciences / Editions scientifiques et medicales Elsevier SAS.
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