Abstract
The Southern and Northern-Central Tian Shan are sharply different in the character of the evolution of Cretaceous-Paleogene magmatism. The Southern Tian Shan comprises a picrobasalt-trachybasalt-basanite-phonotephrite-phonolite volcanic series, which was formed over a considerable time interval from 122 to 46 Ma, whereas the Northern-Central Tian Shan hosts a foidite-basanite-trachybasalt-basaltbasaltic andesite volcanic association, which erupted within a rather narrow time interval between 61 and 53 Ma. The entire volcanic series of the former region was derived from a shallow garnet-free mantle source. The volcanic assemblage of the latter region included basanites and foidites derived from a deep garnet-bearing mantle source, whereas trachybasalt, basalt, and basaltic andesite melts were generated in the lower crust. It is supposed that the change of sources and different evolutionary trends of Cretaceous-Paleogene magmatism in the Southern and Northern-Central Tian Shan were caused by the activation of the heterogeneous lithosphere beneath the converging shores of the Late Paleozoic Turkestan paleoocean.
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Original Russian Text © S.V. Rasskazov, I.S. Chuvashova, A.V. Mikolaichuk, E.R. Sobel, T.A. Yasnygina, N.N. Fefelov, E.V. Saranina, 2015, published in Petrologiya, 2015, Vol. 23, No. 3, pp. 308–336.
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Rasskazov, S.V., Chuvashova, I.S., Mikolaichuk, A.V. et al. Lateral change of sources for the Cretaceous-Paleogene magmatism of the Tian Shan. Petrology 23, 281–308 (2015). https://doi.org/10.1134/S0869591115010038
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DOI: https://doi.org/10.1134/S0869591115010038