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• W2019929476 abstract "Major and trace element analyses [including rare earth elements (REE)], as well as RbSr (whole rocks and micas), UPb (zircons) and SmNd (whole rocks) isotopic data for eclogites and basic granulites from the pan-African Belt suggest the existence of two distinct tectonic settings. An occurrence of high grade rocks, located along the pan-African suture zone in Togo, involves basic protoliths derived from depleted mantle source(s) with ϵNd(T) generally close to +7, or +2 in cumulate rock-types. The ages of their protoliths are not precisely determined but are probably Proterozoic (younger than 1.15 Ga). They are thought to have been involved into subduction-obduction processes (640-580 Ma ago) which affected pan-African (s.l.) oceanic and continental crust. A second occurrence of high-grade rocks located in the Aleksod area of the central Hoggar (Algeria) has also been investigated. It corresponds to older (≅2.5 Ga) basic protoliths metamorphosed during the pan-African orogeny. These rocks are considered to belong to an intracontinental context as proposed for this part of the belt. A model is proposed to account for the “step-shaped” REE patterns sometimes observed in certain eclogite whole-rock samples. In the case of eclogites from the Mount Lato area, these REE patterns are not representative of magmatic protoliths. Some LREE-loss occurred during high-grade events particularly evidenced in syn-eclogite blastomylonites." @default.
• W2019929476 created "2016-06-24" @default.
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• W2019929476 date "1991-06-01" @default.
• W2019929476 modified "2023-10-06" @default.
• W2019929476 title "Isotopic (RbSr, UPb and SmNd) and trace element geochemistry of eclogites from the pan-African Belt: A case study of REE fractionation during high-grade metamorphism" @default.
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• W2019929476 doi "https://doi.org/10.1016/0024-4937(91)90019-h" @default.
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