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ROLE OF METASOMATIC PROCESSES IN RUBY-BEARING MARBLES FORMATION OF THE SOUTHERN URAL MOUNTAINS

地学前缘 2017年第3期24卷 257-262页

作者： A.KISSIN a.tomilina V.KOMASHCHENKO Zavaritsky Institute of Geology and Geochemistry Ekaterinburg 620016 Russia North Caucasusmining Metallurgical Institute (State Technical University) Ekaterinburg 620016 Russia

Ruby-bearing marbles of the Southern Ural Mountains are developed in the metamorphic perimeter of granites-gneisses domes where high grade metamorphic granitization and diaphthoresis have *** research into the development and occurrence of ruby-bearing marbles indicate that they formed as a result of repeated *** substrate consisted of an organogenous marine limestone containing Visean faunal *** Mg metasomatism of limestone during early progressive stages of metamorphism resulted in a substrate of dolomite composition containing faunal remains with a calcite *** temperature and pressure resulted in metamorphism of early Mg metasomatites,turning them into fine-grained marble containing Visean faunal *** stresses near the intrusive domes resulted in dedolomitization of early Mg metasomatites,giving rise to light,coarse-grained calcite marbles having polygonal-grained *** carbonaceous marbles became metamorphosed around the perimeter of granite-gneiss *** rheological properties allowed for plastic flow in these marbles into areas of tectonic neutrality,forming bodies of rheomorphic marbles,sometimes even among marbled *** bodies of Mg metasomatites underwent boudinage and *** cleavage occurred in axial blocks of inter-dome structures and in their steep *** platy jointing(banding,pseudo-lamination)formed in the *** of the plates is from several millimeters to *** underwent recrystallization with extension of grain size in the central parts of plates,sometimes amounting to 15-25cm in ***-bearing marbles consist of *** rock is coarse-grained,with a panidiomorphic *** is often observed in the plane of ***-calcite marble occurs among and grades into background calcite marbles,which are controlled by cleavage of *** is supposed that the ruby-bearing Mg-calcite ma

关键词： Ural gems ruby marbles metasomatism

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