Geologicheskii Vestnik

The products of an interplate plume-dependent magmatism are described, that were formed in a process of an accretion of Magnitogorsk paleo-arc to the margin of the East European continent and subsequent hypercollision.The South Uralian accretionary belt began to form at the terminal stage of development of the Magnitogorsk Island Arc in the Late Frasnian, Famennian and Early Tournaisian. The products of its volcanism are represented mostly by a porphyrite complex, and in the eastern fringe of it — by a subalkaline monzonite-shoshonite-latite volcano-intrusive complex, which was intermediate between the suprasubductional and intraplate geodynamic regimes. Synchronously, in the boundary zone of a backarc situation picrite and meymechite volcanics were formed, accompanied by wehrlites, pyroxenites and gabbro-products of a mantle plume. In the process of a changing of tectono-magmatic regime, considerable volumes of volcanogenic and intrusive mantle series of intraplate type were formed in the Magnitogorsk paleo-arc. During the same period, an ascent of hot asthenospheric diapirs (plumes) to the base of a new-formed (accreted) lithosphere of a continental margin took place, forming a complex mantle-crustal series of successive basic and acid phases of magmatism. The acid members of these complexes were formed in a process of anatexis of the lithosphere of continental margin, with geochemical specifics, provided by plume fluids. The intermediate rock types of some complexes are the products of contamination of magmas by island-arc volcanosedimentary associations; products of a crystallization differentiation and cumulative processes are also well seen. At the final stages of development the plume-dependent magmatic complexes overprint the interplate structure of the Uralian collisional orogen. All considered magmatic formations are characterized by specific geochemical features corresponding to suprasubduction and intraplate formations that was related with the peculiarities of magma formation in a post-island-arc setting.

paleo-arc, plume, anatexis, contamination, geochemistry, intraplate and interplate magmatism

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