PREDICTION ESTIMATE OF OLONDO GREENSTONE BELT DIAMONDS AND GOLD (TRANS-BAIKAL TERRITORY)

The purpose of the work is to evaluate the occurrence prospects of various formational and genetic types of diamonds in Olondo greenstone belt as well as to justify the presence of noble metal mineralization associated with dynamometamorphic transformations of the magmatic rocks of basic composition. Methods. The study used the following research methods: compilation of a schlich-mineralogical map of diamonds and their satellite minerals distribution in loose sediments. Schlich testing was accompanied by the lithologic-petrographic study of boulder and pebble, rubble and gravel, deluvial-eluvial disintegrations and natural outcrops of rocks at the sampling points of primary concentrates. Petrographic, mineralogical and geochemical study of the basite-ultrabasic rocks of the complex was carried out using microprobe, X-ray diffraction analysis and other methods. Results. For the first time metakimberlites have been identified. Difluorinated pyroxenites and gas explosive structures have been discovered. The meta-rocks of komatiite series of the Olondo belt have been compared with the diamondiferous komatiites of French Guiana. Conclusions. Kimberlite and komatiite formational genetic types of diamond fields are predicted. The features of probable diamondiferous potential of difluorinated pyroxenites and gas explosive structures are specified. Manifestations of ore gold are found in dynamometamorphites on basalt komatiites, which are the main rocks of the tholeiitic series. Complex sulfide ores (Cu, Ni, Co) with noble metals are forecasted in addition to actual gold ore fields.

diamonds, gold, ultrabasites, komatiites, kimberlites, forecast, chrome pyropes

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