GEOCHEMISTRY OF HIGHLY CARBONACEOUS METASOMATITES OF THE OSPA-KITOI ULTRABASIC MASSIF (East Sayan)
V.B. Savel'eva, Yu.V. Danilova, B.S. Danilov, V.V. Markova, and S.V. Panteeva
Institute of the Earth's Crust, Siberian Branch of the RAS, 128 ul. Lermontova, Irkutsk, 664033, Russia
Keywords: Rare-earth elements, metasomatites, carbon, fluid
Pages: 1381-1388
Subsection: PETROLOGY, GEOCHEMISTRY, AND MINERALOGY
Abstract
Distribution of trace elements in highly carbonaceous metasomatites of the Ospa-Kitoi ultrabasic massif (East Sayan) was studied by mass spectrometry with inductively coupled plasma (ICP-MS). Though the ultrabasites are strongly depleted in lithophile elements, the metasomatites developed after these rocks and serpentinites are slightly enriched in Rb, Cs, Ba, Y, Nb, Pb, Sn, and REE. The increase in contents of light REE and trace lithophile and chalcophile elements in the metasomatites is the result of the activity of reduced graphite-forming fluid. Carbonatization of serpentinites is accompanied by an increase in contents of MREE and HREE in them.
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