Abstract
The protoliths of the Early Proterozoic metamorphic complex in the Batomga granite-greenstone terrane are proved to comprise two petrochemical series of volcanic rocks: calc-alkaline and komatiite-tholeiite. The metavolcanic rocks of the calc-alkaline series are metamorphosed basalts, andesites, dacites, and rhyolites. The topology of the trace-element patterns of the acid volcanics is similar to that of Archean gray gneisses in platform basements, and this suggests that the petrologic mechanisms that produced the protoliths could be similar. The metavolcanics of the komatiite-tholeiite series are determined to include komatiite and tholeiite basalts. Their chemical composition is consistent with the fractionation model of high-Mg basalts in intermediate chambers under low pressures. The Nb, Y, and Zr concentrations of the metatholeiites testify that their parental melts were derived from a plume source. The metamorphic culmination parameters of the rocks corresponded to the boundary between the amphibolite and granulite facies of elevated pressure.
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Original Russian Text © G.M. Vovna, M.A. Mishkin, A.M. Lennikov, R.A. Oktyabr’skii, V.F. Polin, Z.G. Badredinov, T.A. Yasnygina 2013, published in Geokhimiya, 2013, Vol. 51, No. 12, pp. 1076–1089.
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Vovna, G.M., Mishkin, M.A., Lennikov, A.M. et al. Geochemistry and metamorphic parameters of rocks in the Batomga granite-greenstone terrane, Aldan Shield. Geochem. Int. 51, 968–980 (2013). https://doi.org/10.1134/S0016702913120100
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DOI: https://doi.org/10.1134/S0016702913120100