Russian Geology and Geophysics 1068-7971 10 2013 10 01 2013 54 10 Petrology and geochemistry of gabbro and picrites from the Altai collisional system of Hercynides: evidence for the activity of the Tarim plume S.V. Khromykh a V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk 630090 Russia b Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia Novosibirsk State University, ul. Pirogova 2, Novosibirsk 630090 Russia A.G. Vladimirov a V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk 630090 Russia b Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia Novosibirsk State University, ul. Pirogova 2, Novosibirsk 630090 Russia c Tomsk State University, pr. Lenina 36, Tomsk, 634050, Russia Tomsk State University, pr. Lenina 36, Tomsk 634050 Russia A.E. Izokh a V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk 630090 Russia b Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia Novosibirsk State University, ul. Pirogova 2, Novosibirsk 630090 Russia A.V. Travin a V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk 630090 Russia I.R. Prokop’ev a V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk 630090 Russia E. Azimbaev d Bast LLP, ul. Irtyshskaya 17, Semey, Kazakhstan Bast LLP, ul. Irtyshskaya 17, Semey Kazakhstan S.S. Lobanov a V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk 630090 Russia Abstract

We present petrological, isotopic, and geochronological data on gabbro-picrite plutons from the Altai collisional system of Hercynides (eastern Kazakhstan). The geological, geochemical, and geochronological data suggest that these rocks are indicators of the activity of the Tarim plume. The gabbro and picrites formed in two stages (~293 and 280 Ma) in an acid-to-basic succession, explained by a model for the interaction of thermochemical plumes with the lithosphere. Early igneous activity, which gave rise to subalkalic gabbro plutons, reflects the first interaction between the ascending plume and the lithosphere, with low-melting sublithospheric protoliths. Further interaction was characterized by the sublithospheric spread of the plume head with intense heating of the lithospheric base and possible intrusion of deep melts, which resulted in the formation of Cu–Ni–PGE gabbro-picrite plutons in the Altai collisional system and Northwest China.

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