PYROXENES FROM THE ROCKS OF POKROVO-KYRYIVSKYI MASSIF: FEATURES OF MORPHOLOGY AND CHEMICAL COMPOSITION
Keywords:
clinopyroxenes, endiopside, pyroxenites, gabbro, malignites, nepheline syenites, Pokrovo-Kyryivskyi massif, Ukrainian Shield.Abstract
Morphological and chemical peculiarities of clinopyroxenes from pyroxenites, gabbros, ma-lignites and nepheline syenites of Pokrovo-Kyryivskyi massif are described. The chemical com-position of clinopyroxenes from all researched rock species is different, despite their some mor-phological similarity. The most interesting is the fixation of endiopside in the nucleus of pyroxene in gabbro, which suggests that gabbros crystallized earlier than pyroxenites, in which pyroxenes are represented by calcium augite. It is proved that these rocks are not linked by mu-tual transitions. The obtained data confirm the discreteness of the Pokrovo-Kyryivskyi massif rocks and show that their crystallization does not correspond to the standard scheme.
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