Tsymbal Y. Typomorphism of the diamond and its mineral-satellites from sedimentary rocks of the western part of the Ukrainian shield

Thesis for сandidate's degree by speciality 04.00.20 - mineralogy, crystallography. - M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of National Academy of Sciences of Ukraine, Kyiv, 2009. The typomorphic features of diamond and its mineral-satellites from Palaeogene and Neogene sediments are described. The regularity of their location, source, alimentations and paleogeographic conditions of dispersion aureole formation are considered. The similarity of diamonds from dispersion aureole to fine diamonds from kimberlites is shown, while impact type diamonds are identical to those from Illintsi and Belylivka astroblemes structures. Basing of the typochemical properties of pyrope, pyrope-almandine and chromspinellides it is drawn a conclusion about their formation mainly on shallow depths on the upper mantle. The most part of pyropes belong to lherzolitic and pyroxenitic paragenesis, and pyrope-almandines - to eclogitic paragenesis, including diamondbearing association. The influence of mantle metasomatism on some parent rocks related to some pyropes is established. The types of chromspinellides in dispersion aureole and their paragenesis are determined. It is proved, that lowmagnesian chromspinellides, moderatemagnesian ilmenites and lowchromian diopsides found in dispersion aureole are originated from the crust and they cannot be considered as satellites of diamond. Typification of dispersion aureole on age, genesis and location concerning sources of mineral alimentations is made. Conditions of formation of dispersion aureole are reconstructed. The location of mineral alimentation areas is determined.