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Experimental investigation of near-liquidus andalusite-topaz relations in synthetic peraluminous haplogranites at 200 MPa

Published online by Cambridge University Press:  05 July 2018

D. B. Clarke ,
B. Wunder ,
H.-J. Förster ,
D. Rhede  and
A. Hahn
D. B. Clarke*
Affiliation:
Department of Earth Sciences, Dalhousie University, Halifax, NS, Canada B3H 3J5
B. Wunder
Affiliation:
GFZ German Research Centre for Geosciences, Telegrafenberg, D-14473 Potsdam, Germany
H.-J. Förster
Affiliation:
GFZ German Research Centre for Geosciences, Telegrafenberg, D-14473 Potsdam, Germany
D. Rhede
Affiliation:
GFZ German Research Centre for Geosciences, Telegrafenberg, D-14473 Potsdam, Germany
A. Hahn
Affiliation:
GFZ German Research Centre for Geosciences, Telegrafenberg, D-14473 Potsdam, Germany School of Geography, Geology and the Environment, Kingston University, Kingston-upon-Thames, Surrey KT1 2EE, UK
*
* E-mail: clarke@dal.ca
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Abstract

Many evolved peraluminous granite plutons contain either andalusite (Al2SiO5) or topaz (Al2SiO4(OH,F)2), but some plutons contain both of these A/NK [mol. Al2O3/(Na2O+K2O)] = ∞ phases. We present the results of experiments conducted to locate the andalusite-topaz boundary in water-saturated peraluminous haplogranite melts in T-P-Xspace, where T = 700—650°C, P = 200 MPa. andX(A/NK = 1.1, 1.2, 1.3, 1.4, and F = 0, 1, 2, 4 wt.%).The starting materials are synthetic K-Na-Al-Si gels, with added H2O and AgF, with seeds of natural andalusite and topaz, and with run times of 5—7 days. Phase identification is by electron microprobe. All experimental run products contained quartz. For all values of bulk A/NK, F concentrations ⩽ 1 wt.% favour andalusite stability, whereas F concentrations ⩾ 1 wt.% favour topaz stability. For bulk A/NK ⩽ 1.2 and intermediate F concentrations, no A/NK = phase is present; for bulk A/NK ⩾ 1.3, quench or metastable mullite formed. Topaz reaction rims on naturally occurring andalusite, frequency of naturally occurring assemblages, general chemical considerations, and experimental evidence all suggest that some topaz is the product of a peritectic reaction between an early primary magmatic andalusite and a late F-enriched melt. The appearance of such topaz is an important mineralogical expression of F activity in the melt, and may be an indicator for high field-strength Sn-W-U-Mo polymetallic mineralization.

Keywords

peraluminoushaplograniteandalusitetopazstability
Type
Research Article
Information
Mineralogical Magazine , Volume 73 , Issue 6 , December 2009 , pp. 997 - 1007
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2009

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