ON THE SOURCE OF WATER-BEARING METASOMATO SIS IN THE MANTLE CHROMITE BEARING ULTRABASIC ROCKS - ISOTOPIC COMPOSITION OF HYDROGEN AND OXYGENAND THE CHEMICAL-COMPOSITION OF THE KEMPIRSAY MASSIF

The geochemical and isotopic studies of the Kempirsay massif rocks wer e carried out. It was shown that the amfibole and chlorite formation i n the mantle rocks could be considered as a result of the successive i nteraction of peridotites and chromites with the metamorphised sea wat er, nonmetamorphised sea water and finally the surface meteoric water after the obduction of a plate on the continent. The amfibolisation an d chloritisation are known as factors of mantle geochemical unhomogene ity.