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Crystallization of AlPO4-SiO2 solid solutions from granitic melt and implications for P-rich melt inclusions in pegmatitic quartz

  • Ilya V. Veksler EMAIL logo , Rainer Thomas and Richard Wirth
Published/Copyright: March 31, 2015
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Abstract

Aluminum orthoposphate (AlPO4) has polymorphs isostructural with tridymite, cristobalite, and quartz. Berlinite is the low-temperature form that corresponds to α-quartz. We report berlinite-quartz solid solutions to crystallize from a synthetic P-rich peraluminous granitic melt, similar in composition to the most volatile-rich silicate melt inclusions found in pegmatites. The crystallization took place in experiments performed in cold-seal pressure vessels at 450-700 °C and 0.1-0.2 GPa H2O pressure. At these conditions, the berlinite-quartz mutual solubility is limited to 5-7 mol% SiO2 on the phosphate side of the solvus and to the maximum of 1 mol% AlPO4 on the silica-rich side. The mutual solubility appears to decrease with falling temperature. At low T the crystals of berlinitequartz solid solutions are strongly zoned and show complex intergrowths between the P-rich and silica-rich phases. They were studied by electron microprobe, transmission electron microscopy, and Raman spectroscopy. In the light of our new experimental results, the extreme P enrichment reported earlier for some natural quartz-hosted melt inclusions may be explained as a post-entrapment contamination by the berlinite-bearing host.

Received: 2002-11-28
Accepted: 2003-7-17
Published Online: 2015-3-31
Published in Print: 2003-11-1

© 2015 by Walter de Gruyter Berlin/Boston

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