Инд. авторы:	Chepurov A., Dereppe J.M., Turkin A., Lin V.
Заглавие:	From subcalcic pyropes to uvarovites: experimental crystallization of Cr-rich garnets in ultramafic systems with presence of Ca-bearing hydrous fluid
Библ. ссылка:	Chepurov A., Dereppe J.M., Turkin A., Lin V. From subcalcic pyropes to uvarovites: experimental crystallization of Cr-rich garnets in ultramafic systems with presence of Ca-bearing hydrous fluid // NEUES JAHRBUCH FUR MINERALOGIE-ABHANDLUNGEN. - 2018. - Vol.195. - Iss. 1. - P.65-78. - ISSN 0077-7757.
Внешние системы:	DOI: 10.1127/njma/2018/0084; РИНЦ: 35514934; SCOPUS: 2-s2.0-85041900592; WoS: 000427023000005;
Реферат:	eng: Chromium-rich garnets found as inclusions in diamonds and in mantle xenoliths have specific variations of their CaO content. The low-Ca varieties are subcalcic pyropes in clinopyroxene-free harzburgites and pyropic garnets in lherzolites, while Ca rich uvarovitic garnets occur in wehrlites. The variation in CaO of Cr-rich garnets results from early partial melting and subsequent metamorphic and metasomatic processes. A hydrous fluid is one endmember of possible metasomatic agents transporting different geochemical components in nature. We try to establish here its role in processes of formation of Cr-rich garnets. This work presents results of experiments aimed at the crystallization of Cr-rich garnets with wide variations of CaO and Cr2O3 in ultramafic system during the interaction of natural antigorite, chromite and corundum with a Ca-bearing hydrous fluid. The experiments were carried out using a multi-anvil high pressure apparatus BARS at a pressure of 5 GPa and a temperature of 1300 degrees C. Starting materials were natural serpentine, chromite and corundum. At the P-T conditions of the experiments serpentine decomposes into a harzburgite paragenesis and a hydrous fluid. CaO was placed separately from the sample modelling a metasomatic Ca-source. in the experiments crystallization of Cr-rich pyropic garnets (6-12 wt.% Cr2O3 and 0.1-6 wt.% CaO) and uvarovitic garnets (14-21 wt.% Cr2O3 and 13-24 wt.% CaO) occurred, showing a trend from low-Ca pyrope varieties of harzburgitic association to Ca-rich uvarovitic garnets of wehrlites. Our results demonstrate that a hydrous fluid can play a significant role for the crystallization of Cr-rich garnets.
Ключевые слова:	CONSTRAINTS; INCLUSIONS; DIAMONDS; RE-OS; SOUTH-AFRICA; HIGH-PRESSURE; PERIDOTITE XENOLITHS; METASOMATIC PROCESSES; experimental petrology; diamond; high pressure; serpentine; chromite; uvarovitic garnet; subcalcic garnet; LITHOSPHERIC MANTLE; KIMBERLITE;
Издано:	2018
Физ. характеристика:	с.65-78
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