EXPERIMENTAL STUDY OF SOME JOINS IN THE SYSTEM CAMGSI2O6-(CA,MG)3AL2SI3O 12-KALSI2O6-K2(CA,MG)(CO3 )2 AT 5-7 GPA IN RELATION TO THE GENESIS OF GARNET-CLINOPYROXENE-CARBONATE ROCKS OF THE KOKCHETAV COMPLEX, NORTHERN KAZAKHSTAN
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dc.contributor.author | Safonov O.G. | |
dc.contributor.author | Litvin Yu.A. | |
dc.contributor.author | Matveev Yu.A. | |
dc.contributor.author | Perchuk L.L. | |
dc.date.accessioned | 2021-06-07T12:43:22Z | |
dc.date.available | 2021-06-07T12:43:22Z | |
dc.date.issued | 2002 | |
dc.identifier | https://elibrary.ru/item.asp?id=13390999 | |
dc.identifier.citation | Petrology, 2002, 10, 6, 519-539 | |
dc.identifier.issn | 0869-5911 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/28853 | |
dc.description.abstract | An experimental study of the CaMgSi2O6-Ca3Al2Si3O12-K2Mg(CO3)2, CaMgSi2O6-Mg3Al2Si3O12-K2Ca(CO3)2 and CaMgSi2O6-KAlSi2O6 joins of the carbonate-silicate system CaMgSi2O6-(Ca,Mg)3Al2Si3O 12-KAlSi2O6-K2(Ca,Mg)(CO3 )2 was conducted at pressures of 5-7 GPa and temperatures of 950-2000°C in order to model phase equilibria in the diamondiferous Mg-rich garnet-clinopyroxene-carbon-ate rocks of the Kokchetav Complex. Phase diagrams are constructed on the basis of the experiments. The diagrams reflect the crystallization sequence of phases from ultrapotassic Mg-rich carbonate-silicate and aluminosilicate melts. The crystallization field of potassium-bearing clinopyroxene (characteristic for the Kokchetav Complex) with Ca-rich garnet and carbonates is outlined. Clinopyroxene containing more than 1 wt % K2O is a liquidus mineral in the diopside-rich (above 50 mol %) portions of these systems. Garnet becomes a liquidus mineral at lower diopside content. The experimental results show that ultrapotassic carbonate-silicate and aluminosilicate melts can be favorable media for the initial crystallization of garnet-clinopyroxene-carbonate rocks of the Kokchetav Complex at depths of >150 km. | |
dc.title | EXPERIMENTAL STUDY OF SOME JOINS IN THE SYSTEM CAMGSI2O6-(CA,MG)3AL2SI3O 12-KALSI2O6-K2(CA,MG)(CO3 )2 AT 5-7 GPA IN RELATION TO THE GENESIS OF GARNET-CLINOPYROXENE-CARBONATE ROCKS OF THE KOKCHETAV COMPLEX, NORTHERN KAZAKHSTAN | |
dc.type | Статья |
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