Internal differentiation of rare-element pegmatites: Effects of boron, phosphorus, and fluorine

Details Internal differentiation of rare-element pegmatites: Effects of boron, phosphorus, and fluorine Internal differentiation of rare-element pegmatites: Effects of boron, phosphorus, and fluorine

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51..403l&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 51, Issue 3, pp.403-420

Computer Science

22

Scientific paper

Lithium-rich, rare-element pegmatites are characterized by high concentrations of B, P, and F. The interactions of these components with H 2 O and rare alkalis lower liquidas and solidus temperatures, enhance silicate liquid-H 2 O miscibility, and control partitioning and concentration of Group I elements and higher-field-strength cations. Boron, F, and perhaps P may form peralkaline Na- and Li-species that promote early saturation in mica + quartz. Activities of F, P, and especially B are largely unbuffered throughout crystallization. Concentration of these components through fractional crystallization involving muscovite generates a peralkaline, Na-aluminosilicate-rich melt or vapor from which albitites rich in tourmaline, phosphates, F-rich micas, beryl, zircon, and Nb-Ta-Sn oxides crystallize. Phase equilibrium experiments with peraluminous B-P-F-rich rhyolite obsidian (macusanite) simulate many features of rare-element pegmatites, especially at H 2 O-undersaturated conditions.

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