Abstract
The Aleksod terrane Eclogites, sited in the Central Hoggar, preserve a selection of eclogite-facies assemblage (coarse garnet, omphacite, quartz, clinozoisite and amphibole). During retrogression, these minerals were partially substituted with coronas and symplectites of diopside-plagioclase and amphibole-plagioclase. The almandine-dominated garnet proves to enclose heterogeneous compositions (XAlm0.30–0.56). The omphacite displays a high XJd of 0.31. The eclogite-facies coarse amphibole is magnesio-hornblende with NaM4 = 0.31–0.47. The plagioclase is usually secondary exhibiting a range of composition from oligoclase to anorthite (XAn = 0.20–0.99), where albite-rich and anorthite-rich compositions prove to correspond, respectively, to symplectite after omphacite and coronas around epidote. The relevant P-T pseudosections using THERMOCALC-340 are calculated to estimate peak conditions and trace the P-T evolution. At H2O-saturated conditions, inclusions of amphibole in garnet core with garnet composition from core to inner rim are used to trace pre-peak P-T path from 14 kbar–610 °C to 18 kbar–700 °C. At H2O-undersaturated conditions, the retrograde path has been traced using secondary phases as plagioclase, diopside and amphibole at 10 kbar–720 °C.
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Sidali, D., Gaston, G., Khadidja, O., Amar, A., Abderrahmane, B. (2019). Petrography, Mineralogy and Thermodynamic Modeling of Eclogites from the Serkout Area, Central Hoggar, Algeria. In: Doronzo, D., Schingaro, E., Armstrong-Altrin, J., Zoheir, B. (eds) Petrogenesis and Exploration of the Earth’s Interior. CAJG 2018. Advances in Science, Technology & Innovation. Springer, Cham. https://doi.org/10.1007/978-3-030-01575-6_15
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