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Variations in the Concentration of Ta and Nb in a Peraluminous Haplogranite High-Fluorine Melt in Relation to the Change in the Association of Liquidus Phases

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Abstract—

A series of experiments were carried out in the peraluminous part of the haplogranite high fluorine system SiO2–Al2O3–Na2O–Li2O–F at a temperature of 700°C, a pressure of 100 МPa, a water content of 10 wt %, and with the addition of ~1 wt % Ta and Nb. Two types of equilibrium phase associations were obtained: (1) an aluminosilicate melt–topaz–quartz–Ta-Nb phase and (2) an aluminosilicate melt–brine aluminofluorine melt–cryolite. The maximum content of Ta and Nb in the silicate melt of the first type is ~0.29 and 0.35 wt %, respectively. The silicate melt of the second type is characterized by an almost four-fold content of these metals (1.27 and 1.21 wt %, respectively), without reaching saturation by the Ta–Nb phase. A similar jump in the total amount of Ta and Nb in genetically related highly differentiated rocks was observed for topaz- and cryolite-bearing granite massifs in the Piting Province (Brazil).

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ACKNOWLEDGMENTS

Analytical data were obtained at the Laboratory of Local Methods of Materials Study (Chair of Petrology, Department of Geology, Moscow State University), using the JEOL JXA-8230 electron microprobe purchased by the Moscow University Development Program. The authors are grateful to N.N. Korotaeva, E.V. Guseva, and V.O. Yapaskurt.

Funding

The laboratory studies were supported by the Russian Foundation for Basic Research, project no. 16-05-00859.

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Authors and Affiliations

  1. Department of Geology, Moscow State University, 119991, Moscow, Russia

    Ya. O. Alferyeva, E. N. Gramenitskiy, T. I. Shchekina & N. G. Zinovieva

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  1. Ya. O. Alferyeva
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  2. E. N. Gramenitskiy
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  3. T. I. Shchekina
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  4. N. G. Zinovieva
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Correspondence to Ya. O. Alferyeva, E. N. Gramenitskiy, T. I. Shchekina or N. G. Zinovieva.

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Translated by A. Bobrov

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Alferyeva, Y.O., Gramenitskiy, E.N., Shchekina, T.I. et al. Variations in the Concentration of Ta and Nb in a Peraluminous Haplogranite High-Fluorine Melt in Relation to the Change in the Association of Liquidus Phases. Moscow Univ. Geol. Bull. 74, 393–400 (2019). https://doi.org/10.3103/S0145875219040033

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  • DOI: https://doi.org/10.3103/S0145875219040033

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