Assimilation of carbonates by mafic magma: fassaite gabbro of the olkhon terrane (western baikal region)

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Abstract

The paper characterizes specific gabbro, the main rock-forming mineral of which is fassaite – alumina-rich (up to 12% Al2O3) calcium pyroxene, typical for high-temperature metasomatic rocks. In terms of geochemical characteristics, the fassaite gabbro are close to the subalkaline monzogabbro of the Ust-Krestovsky complex, which are widely distributed within the Krestovsky subterrane of the Olkhon terrane (Western Baikal region). At the same time, they differ sharply from the latter in terms of higher content of CaO and MgO and lower content of SiO2 and Al2O3. Fassaite gabbro form several small massifs framed by the Ust-Krestovsky monzogabbro massif, without contacting the latter. A model of the formation of fassaite gabbros due to the assimilation of carbonate material (crustal carbonate melting) by subalkaline mafic magma is proposed.

About the authors

E. V. Sklyarov

Institute of the Earth’s Crust, Siberian Branch of the Russian Academy of Sciences

Author for correspondence.
Email: skl@crust.irk.ru

Corresponding member of the RAS

Russian Federation, Irkutsk

A. V. Lavrenchuk

V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University

Email: alavr@igm.nsc.ru
Russian Federation, Novosibirsk; Novosibirsk

D. V. Semenova

V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences

Email: skl@crust.irk.ru
Russian Federation, Novosibirsk

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