RT Journal Article
T1 El metamorfismo de alta presión-baja temperatura en los esquistos de Filali-Benzou (Sébtides, Marruecos) Termobarometría con la asociación cloritoide-granate-fengita
T1 HP-LT metamorphism of the Filali-Bénzou schist rocks (Sebtides, Morocco). Chloritoid-garnet-phengite thermobarometry
A1 Bouybaouene, M.
A1 Alami, R
A1 Azañón, José Miguel
A1 Goffé, B.
AB The paleozoic schist rocks of Benzou outcrop in the core of the Beni Mzala's antiformal stack (Upper Sebtides units). In these schist rocks, we have found the association garnet (XFe=0.89-0.94), chloritoid (XMg=0.12-0.22), chlorite (XMg=0.40-0.45), biotite (XMg=0.37) and fengite (Si=3.23-3.44 a.p..u.) which grows in the KFMASH system with a ferrous tendency. The metamorphic peak has been estimated around 12 Kbar in pressure and 500°C in temperature According id the garnet (XFe=0.94) ± fengite (Si=3.44 a.p.u) association and the Chloritoid + Biotitè = Garnet + Fengite equilibrium. The secondary mineral association: chloritoid, biotite, chlorite and fengite (Si=3.1 7-3.23) indicates a pressure drop accompanied by cooling during the post-pèak path. The thermobarometriC data show that these Palaeozoic rocks have suffered a high-pressure low-temperature metamorphism in contrast with the classic estimations of P-T conditions of schist rocks belonging to Filali units (Palaeozoic in âgé; P=5-7 Kbàr y T=550-700°C). We propose that Benzou schist rocks are the lower part of the Beni Mzala unit and they could be transitional levels to the metapelite formations represented in the Filali units. Similar transitional metápélite rocks have been observed in the Alpujarride units
PB Sociedad Geológica de España
YR 1999
FD 1999
LK http://hdl.handle.net/10272/10084
UL http://hdl.handle.net/10272/10084
LA spa
DS Repositorio Institucional de la Universidad de Huelva
RD 30 may 2026