Hydrosilicate liquids in the system rare-metal granite–Na2O–SiO2–H2O as accumulators of ore components at high pressure and temperature


Cite item

Full Text

Open Access Open Access
Restricted Access Access granted
Restricted Access Subscription Access

Abstract

Experimental investigations in the system rare-metal granite–Na2O–SiO2–H2O with the addition of aqueous solutions containing Rb, Cs, Sn, W, Mo, and Zn at 600°C and 1.5 kbar showed that the typical elements of rare-metal granites (Li, Rb, Cs, Be, Nb, and Ta) are preferentially concentrated in hydrosilicate liquids coexisting with aqueous fluid. The same behavior is characteristic of Zn and Sn, the minerals of which are usually formed under hydrothermal conditions. In contrast, Mo and W are weakly extracted by hydrosilicate liquids and almost equally distributed between them and aqueous fluids. Liquids similar to those described in this paper are formed during the final stages of magmatic crystallization in granite and granitepegmatite systems. The formation of hydrosilicate liquids in late magmatic and postmagmatic processes will be an important factor controlling the redistribution of metal components between residual magmatic melts, minerals, and aqueous fluids and, consequently, the mobility of these components in fluid-saturated magmatic systems enriched in rare metals.

About the authors

S. Z. Smirnov

Sobolev Institute of Geology and Mineralogy, Siberian Branch; Tomsk State University

Author for correspondence.
Email: ssmr@igm.nsc.ru
Russian Federation, Novosibirsk, 630090; Tomsk, 634050

V. G. Thomas

Sobolev Institute of Geology and Mineralogy, Siberian Branch

Email: ssmr@igm.nsc.ru
Russian Federation, Novosibirsk, 630090

V. S. Kamenetsky

ARC Center of Excellence in Ore Deposits

Email: ssmr@igm.nsc.ru
Australia, Hobart, Tasmania, 7001

O. A. Kozmenko

Sobolev Institute of Geology and Mineralogy, Siberian Branch

Email: ssmr@igm.nsc.ru
Russian Federation, Novosibirsk, 630090

Supplementary files

Supplementary Files
Action
1. JATS XML

Copyright (c) 2017 Pleiades Publishing, Ltd.