Title: GRANULITISATION OF FRONTAL NAPPES IN THE KABYÈ MASSIF IN NORTHERN TOGO
Abstract:The Kabye Massif represents one of disseminated hills which marks the suture zone of the Panafrican Dahomeyides Belt in northen Togo. Coronitic structures were described in high-grade granulites compo...The Kabye Massif represents one of disseminated hills which marks the suture zone of the Panafrican Dahomeyides Belt in northen Togo. Coronitic structures were described in high-grade granulites composing the frontal nappes on the south-western edge of the massif. Granulitisation is investigated through petrofabric study of the frontal nappes rocks of Kabye Massif. Two stages of granulitisation are revealed: the first one corresponds to the formation of granulites with an Opx + Pl + Cpx + Grt ± Qtz paragenesis ; the second one has a Cpx + Pl + Grt + Qtz ± Ilm mineral assemblage. The former corresponds to metamorphic recristallization of about medium-pressure to high-temperature conditions (P = 10 to 13 kbar and T = 900 with 1000°C). The latter, which developed coronitic structures, is interpretated as formed at an ultra-high-pressure and medium- to hightemperature conditions (P = 13 to 19 kbar and T = 850 to 900°C). These coronitic petro-fabrics define an anticlockwise P-T paths trajectories corresponding to the collision and the beginning of the nappes extraction during the Panafrican tectonics.Read More
Publication Year: 2015
Publication Date: 2015-10-29
Language: en
Type: article
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