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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
journal contribution
posted on 2023-05-26, 10:06 authored by Smirnov, SZ, Thomas, VG, Vadim Kamenetsky, Kozmenko, OA, Ross LargeRoss LargeConsideration 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 Na2O‚Äö-SiO2‚Äö-H2O with addition of NaF, NaCl and metallic Ta. The interaction between quartz and aqueous solution, performed at 1.5 kbar and 600¬¨‚àûC and followed either by cooling or by quench, showed that the formation of HSL occurred when initial Na2O 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‚ÄövÑvp inclusions entrapped in quartz and other minerals of miarolesin granite pegmatites and rare-metal granites. The HSL is a novel medium enabling extreme concentrations of lithophile ore metals at the magmatic-hydrothermal transition.
History
Publication title
PetrologyVolume
20Article number
3Number
3Pagination
271-285ISSN
0869-5911Publication status
- Published
Rights statement
Copyright Copyright Pleiades Publishing Ltd 2012Repository Status
- Restricted
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