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 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
UTAS Author:	Kamenetsky, VS (Professor Vadim Kamenetsky)
UTAS Author:	Large, RR (Professor Ross Large)
ID Code:	81370
Year Published:	2012
Funding Support:	Australian Research Council (CE0561595)
Web of Science® Times Cited:	29
Deposited By:	Centre for Ore Deposit Research - CODES CoE
Deposited On:	2012-12-03
Last Modified:	2013-07-01
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