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Formation and properties of hydrosilicate liquids in the systems Na2O-Al2O3-SiO2-H2O and Granite-Na2O-SiO2-H2O at 600oC and 1.5 kbar

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Thomas, VG and Smirnov, SZ and Kozmenko, OA and Drebushchak, VA and Kamenetsky, VS (2014) Formation and properties of hydrosilicate liquids in the systems Na2O-Al2O3-SiO2-H2O and Granite-Na2O-SiO2-H2O at 600oC and 1.5 kbar. Petrology, 22 (3). pp. 293-309. ISSN 0869-5911

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Abstract

In order to determine the mechanisms of formation and properties of natural hydrosilicate liquids (HSLs), which are formed during the transition from magmatic to hydrothermal mineral formation in granitic pegmatites and rare-metal granites, the formation of HSLs was experimentally studied in the Na2O-SiO2–H2O, Na2O–Al2O3–SiO2–H2O, and Na2O–K2O–Li2O–Al2O3–SiO2–H2O systems at 600°C and 1.5 kbar. It was shown that the sequential extension of composition does not suppress HSL formation in the systems and expands the stability field of this phase. However, HSLs formed in extended chemical systems have different structure and properties: the addition of alumina induces some compression of the structure of the silicate framework of HSLs, which results in a decrease in water content in this phase and probably hinders the reversibility of its dehydration. It was demonstrated that HSL can be formed by the coagulation of silica present in a silica-oversaturated alkaline aqueous fluid. It was supposed that the HSL formed during this process has a highly dispersed structure. It was argued that anomalous enrichment in some elements in natural HSLs can be due to their sorption by the extensively developed surface of HSL at the moment of its formation.

Item Type: Article
Journal or Publication Title: Petrology
Page Range: pp. 293-309
ISSN: 0869-5911
Identification Number - DOI: 10.1134/S0869591114030072
Additional Information:

Copyright 2014 Springer

Date Deposited: 09 Apr 2014 00:06
Last Modified: 18 Nov 2014 04:59
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