Abstract
We determined the chemical composition of high-mg picrite-basaltic melts that formed the ultramafic massifs of the Siberian platform in the study of primary melt inclusions in accessory chrome spinel from dunites. We determined the temperature of crystallization of olivine from dunites of the Gulinsky (1520-1420 °C), Kondersky (1545-1430 °C), Inaglinsky (1530-1430 °C), Chadsky (1460-1420 °C) intrusives and chrome spinels of these complexes: Gulinsky (1410-1370 °C), Kondersky (1420-1380 °C), Inaglinsky (up to 1430 °C), Chadsky (1430-1330 °C), using a computer simulation (program PETROLOG and PLUTON) on the basis of data on the composition of the inclusions. Тhe computational modeling allowed us to establish that there were two types of high-magnesium melt evolution on the Siberian platform. The first type is characteristic of the Gulinsky pluton, where there is the following sequence of formation: the dunites → pyroxenites → alkaline rocks. The second type is represented Kondersky massif, where the sequence is different: dunites → kosvites → pyroxenites and olivine-diopside rocks.
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