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Open AccessArticle

Sulfides in Metamorphic Rocks of the Fore Range Zone (Greater Caucasus). A New Type of Mineral Container for Peak Metamorphism Mineral Assemblages

1
Schmidt Institute of the Physics of the Earth, Russian Academy of Sciences, 10 Bolshaya Gruzinskaya, 123242 Moscow, Russia
2
Geological Institute, Russian Academy of Sciences, 7 Pyzhevskiy lane, 119017 Moscow, Russia
3
Institute of Experimental Mineralogy, Russian Academy of Sciences, 4 Academica Osypyana, Chernogolovka, 142432 Moscow, Russia
4
Geological Faculty, Lomonosov Moscow State University, 1 Leninsky Gory, 119992 Moscow, Russia
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(11), 701; https://doi.org/10.3390/min9110701
Received: 26 September 2019 / Revised: 8 November 2019 / Accepted: 11 November 2019 / Published: 13 November 2019
(This article belongs to the Special Issue From Diagenesis to Low-Grade Metamorphism)
The rocks of the Armovka Formation (the Fore Range zone, Greater Caucasus) have undergone low-grade metamorphism that partially erased information about initial rock formation conditions. We discovered high-pressure mineral inclusions such as omphacite, phengite, garnet, and paragonite enclosed by pyrite and chalcopyrite. Mineral inclusions in sulfides may provide important information about metamorphic pressure−temperature conditions because they are shielded by the host minerals and isolated from significant low-grade overprinting. Calculations performed on phengite inclusions using the phengite Si-content barometry indicate a pressure ranging from 1.7 ± 0.2 to 1.9 ± 0.2 GPa for temperature of 600 ± 40 °C. These data are consistent with estimations obtained for eclogite bodies embedded in rocks of the Armovka Formation. Geothermobarometry of the latest yielded conditions of 680 ± 40 °C and a minimum pressure of 1.6 ± 0.2 GPa to upper pressure boundary at 2.1 GPa. This fact allows us to assume that the metamorphic rocks of the Armovka Formation were immersed in the subduction zone to the conditions of the eclogite facies of metamorphism, forming a coherent subduction complex together with eclogites. View Full-Text
Keywords: mineral containers; pyrite; HP complexes; low-grade alteration mineral containers; pyrite; HP complexes; low-grade alteration
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Kamzolkin, V.A.; Konilov, A.N.; Kulakova, E.P.; Latyshev, A.V.; Smulskaya, A.I.; Ivanov, S.D. Sulfides in Metamorphic Rocks of the Fore Range Zone (Greater Caucasus). A New Type of Mineral Container for Peak Metamorphism Mineral Assemblages. Minerals 2019, 9, 701.

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