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Alkali-deficient tourmaline from the Sullivan Pb-Zn-Ag deposit, British Columbia

Published online by Cambridge University Press:  05 July 2018

Shao-Yong Jiang ,
Martin R. Palmer  and
John F. Slack
Shao-Yong Jiang
Affiliation:
Department of Geology, University of Bristol, Bristol, BS8 IRJ, UK Max-Planck-Institut for Chemie, Abt. Geochemie, Postfach 3060, 55020 Mainz, Germany
Martin R. Palmer
Affiliation:
Department of Geology, University of Bristol, Bristol, BS8 IRJ, UK
John F. Slack
Affiliation:
U.S. Geological Survey, National Center, MS 954, Reston, VA 20192, USA
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Abstract

Alkali-deficient tourmalines are found in albitized rocks from the hanging-wall of the Sullivan Pb-Zn-Ag deposit (British Columbia, Canada). They approximate the Mg-equivalent of foitite with an idealized formula □(Mg2Al)Al6Si6O18(BO3)3(OH)4. Major chemical substitutions in the tourmalines are the alkali-defect type [Na*(x) + Mg*(Y) = □(x) + Al(Y)] and the uvite type [Na*(x) + Al(Y) = Ca(x) + Mg*(Y)], where Na* = Na + K, Mg* = Mg + Fe + Mn. The occurrence of these alkali-deficient tourmalines reflects a unique geochemical environment that is either alkali-depleted overall or one in which the alkalis preferentially partitioned into coexisting minerals (e.g. albite).

Some of the alkali-deficient tourmalines have unusually high Mn contents (up to 1.5 wt.% MnO) compared to other Sullivan tourmalines. Manganese has a strong preference for incorporation into coexisting garnet and carbonate at Sullivan, thus many tourmalines in Mn-rich rocks are poor in Mn (<0.2 wt.% MnO). It appears that the dominant controls over the occurrence of Mn-rich tourmalines at Sullivan are the local availability of Mn and the lack of other coexisting minerals that may preferentially incorporate Mn into their structures.

Keywords

alkali-deficient tourmalineMn enrichmenthydrothermal alterationSullivan minePb-Zn-Ag depositBritish Columbia
Type
Mineralogy
Information
Mineralogical Magazine , Volume 61 , Issue 409 , December 1997 , pp. 853 - 860
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1997

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