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Metamorphic and magmatic overprint of garnet pyroxenites from the Beni Bousera massif (northern Morocco): Petrography, mineral chemistry and thermobarometry

Abstract : A detailed mineralogical and textural study of two pyroxenites from the Beni Bousera massif, a garnet clinopyroxenite (GP) and a garnet clinopyroxenite containing graphite pseudomorphs after diamond (GGP), indicates a strong metamorphic overprint associated with the massif exhumation. In both pyroxenites, the primary assemblage [Cpx(I) + Gt(I) ± Opx] originally stable with diamond, records temperatures in excess of 1200 °C. Along the exhumation path, Cpx(I) has decomposed according to the reaction:CpxI=0.55-0.60CpxII+0.30-0.35OpxII+0.03-0.05GtII+0.03-0.5Pl.
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https://hal-insu.archives-ouvertes.fr/insu-00933753
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Submitted on : Tuesday, January 21, 2014 - 9:52:07 AM
Last modification on : Tuesday, September 22, 2020 - 3:48:38 AM

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Fatima El Atrassi, Fabrice Brunet, Gilles Chazot, Mohamed Bouybaouène, Christian Chopin. Metamorphic and magmatic overprint of garnet pyroxenites from the Beni Bousera massif (northern Morocco): Petrography, mineral chemistry and thermobarometry. Lithos, Elsevier, 2013, 179, pp.231-248. ⟨10.1016/J.LITHOS.2013.08.023⟩. ⟨insu-00933753⟩

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