Evidence of cumulate crystallization and local development of the eclogite-facies metamorphism in the olivine gabbro of the Marun-Keu complex, Polar Urals, Russia
https://doi.org/10.33623/0579-9406-2019-2-94-103
Abstract
The paper presents the results of a detailed petrological study of olivine gabbro transformed to different extent by eclogite-facies metamorphism. Textural features of cumulate crystallization in the rock are presented. Plagioclases underwent the greatest alteration and replaced by finegrained aggregate during eclogite-facies metamorphism. Corona textures are developed along the boundaries of the plagioclase (felscic) domains at the contacts with (Fe,Mg)-minerals during eclogite facies event. The mineral thermobarometry and phase equilibrium modeling provide P-T metamorphic conditions in relatively narrow range of temperature 680±60 ᵒC and pressure Р=2,2±0.4 GPa. This is in a good agreement with the previously established conditions for the formation of eclogites and garnet-amphibole peridotite from the same complex.
About the Authors
Y. Y. Liu
Московский государственный университет имени М.В. Ломоносова
Russian Federation
Russian Federation
A. L. Perchuk
Московский государственный университет имени М.В. Ломоносова;
Институт экспериментальной минералогии РАН имени Д.С. Коржинского
Russian Federation
Russian Federation
N. G. Zinovieva
Московский государственный университет имени М.В. Ломоносова
Russian Federation
Russian Federation
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For citations:
Liu Y.Y., Perchuk A.L., Zinovieva N.G. Evidence of cumulate crystallization and local development of the eclogite-facies metamorphism in the olivine gabbro of the Marun-Keu complex, Polar Urals, Russia. Moscow University Bulletin. Series 4. Geology. 2019;(2):94-103. (In Russ.) https://doi.org/10.33623/0579-9406-2019-2-94-103
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