Crystallization of high-Ca chromium garnet upon interaction of serpentine, chromite, and Ca-bearing hydrous fluid

The results of experimental modeling of the conditions of crystallization of high-Ca chromium garnets in the system serpentine–chromite–Ca-Cr-bearing hydrous fluid at a pressure of 5 GPa and temperature of 1300°С are reported. The mineral association including quantitatively predominant high-Mg oliv...

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Bibliographic Details
Published in:Doklady earth sciences 2017-10, Vol.476 (2), p.1229-1232
Main Authors: Chepurov, A. A., Turkin, A. I., Pokhilenko, N. P.
Format: Article
Language:English
Subjects:
Calcium magnesium silicates
Chromite
Chromium
Composition
Crystallization
Diopside
Earth and Environmental Science
Earth Sciences
Fluids
Garnet
Garnets
Geochemistry
Magnesium aluminum silicates
Minerals
Modelling
Olivine
Peridotite
Serpentine
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Summary:The results of experimental modeling of the conditions of crystallization of high-Ca chromium garnets in the system serpentine–chromite–Ca-Cr-bearing hydrous fluid at a pressure of 5 GPa and temperature of 1300°С are reported. The mineral association including quantitatively predominant high-Mg olivine and diopside-rich clinopyroxene, bright-green garnet, and newly formed chrome spinel was formed. Garnet mostly crystallized around primary chromite grains and was characterized by a high concentration of CaO and Cr 2 O 3 . According to the chemical composition, garnets obtained are close to the uvarovite–pyrope varieties, which enter the composition of relatively rare natural paragenesis of garnet wehrlite. The experimental data obtained clearly show that high-Ca chromium garnets are formed in the reaction of chromite-bearing peridotite and Ca-rich fluid at high P–T parameters.
ISSN:1028-334X
1531-8354
DOI:10.1134/S1028334X1710021X