Possibility of identification of back-arc paleobasins from high-grade orthometamorphite rocks: Evidence from basic crystalline schists of the Slyudyanka crystalline complex,South Baikal region |
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Authors: | S I Shkol’nik L Z Reznitsky I G Barash |
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Institution: | 1.Institute of the Earth’s Crust, Siberian Branch,Russian Academy of Sciences,Irkutsk,Russia |
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Abstract: | The Slyudyanka crystalline complex is located within the composite Khamar-Daban metamorphic terrane, the part of the Central
Asian fold belt. Geochemical composition of the basic crystalline schists of the Slyudyanka Group (subterrane) metamorphosed
under the high-temperature subfacies of the granulite facies suggests that their protoliths were tholeiitic basalts. Their
geochemical signatures are intermediate between mid-ocean ridges and island arc basalts, best approximating back-arc basin
basalts. The types of the metamorphic rocks of the Slyudyanka Group and their combination in sequences also most correspond
to accumulation in back-arc basins. It was concluded that the high-grade metavolcanic rocks retain main geochemical signatures
of protoliths, which allows the reconstruction of their paleogeodynamic settings, including back-arc basins. |
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