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Hydrosilicate liquids in the system Na2O-SiO2-H2O with NaF, NaCl and Ta: evaluation of their role in ore and mineral formation at high T and P

Citation

Smirnov, SZ and Thomas, VG and Kamenetsky, VS and Kozmenko, OA and Large, RR, Hydrosilicate liquids in the system Na2O-SiO2-H2O with NaF, NaCl and Ta: evaluation of their role in ore and mineral formation at high T and P, Petrology, 20, (3) pp. 271-285. ISSN 0869-5911 (2012) [Refereed Article]

Copyright Statement

Copyright 2012 Pleiades Publishing

DOI: doi:10.1134/S0869591112020063

Abstract

Consideration of the existence of hydrosilicate liquids (HSL) in nature can help in understanding the accumulation and transport of some mineral- and ore-forming components at the transition from magmas to hydrothermal fluids. We studied the experimental formation of HSL using a base system Na 2O-SiO 2-H 2O with addition of NaF, NaCl and metallic Ta. The interaction between quartz and aqueous solution, performed at 1. 5 kbar and 600°C and followed either by cooling or by quench, showed that the formation of HSL occurred when initial Na 2O exceeded 2 wt %. Neither NaF nor NaCl have a significant effect on the formation of HSL. The HSL concentrates F, whereas Cl partitions into the aqueous fluid. With addition of Ta to the system, the HSL becomes metal-enriched. Natural analogs of experimental HSL can be found among "melt/fluid" inclusions entrapped in quartz and other minerals of miaroles in granite pegmatites and raremetal granites. The HSL is a novel medium enabling extreme concentrations of lithophile ore metals at the magmatic-hydrothermal transition. © 2012 Pleiades Publishing, Ltd.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Geology
Research Field:Igneous and Metamorphic Petrology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:Kamenetsky, VS (Professor Vadim Kamenetsky)
Author:Large, RR (Professor Ross Large)
ID Code:81370
Year Published:2012
Funding Support:Australian Research Council (CE0561595)
Web of Science® Times Cited:12
Deposited By:Centre for Ore Deposit Research - CODES CoE
Deposited On:2012-12-03
Last Modified:2013-07-01
Downloads:0

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