GEOCHEMISTRY OF THE ORE-FORMING ELEMENTS IN THE CARBONACEOUS MATTER OF METASEDIMENTS FROM THE BAIKAL-PATOM HIGHLAND

The trace-element distribution in the different fractions of the carbo naceous matter from metapelites and metatuffsands of the Patom Group s uggests that regional kyanite-sillimanite metamorphism resulted in the secondary accumulation of some ore-forming and precious metals (Au, A g, Cu, Zn, and, presumably, U and PGE) in the ICM of the greenschist m etasediments and bitumen at the transition from the greenschist to epi dote-amphibolite facies. The set of elements systematically enriched i n the rocks is defined by their high affinity to GM and their low abil ity to isomorphically scatter in silicates from high-temperature metam orphic zones. Earlier, we established similar regularities for the CM in shales of the Khamardaban low-pressure metamorphic complex.