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Tungsten-bearing rutile from the Kori Kollo gold mine, Bolivia

Published online by Cambridge University Press:  05 July 2018

C. M. Rice ,
K. E. Darke ,
J. W. Still  and
E. E. Lachowski
C. M. Rice
Affiliation:
Department of Geology and Petroleum Geology, University of Aberdeen, Aberdeen, Scotland
K. E. Darke
Affiliation:
Department of Geology and Petroleum Geology, University of Aberdeen, Aberdeen, Scotland
J. W. Still
Affiliation:
Department of Geology and Petroleum Geology, University of Aberdeen, Aberdeen, Scotland
E. E. Lachowski
Affiliation:
Department of Chemistry, University of Aberdeen, Aberdeen, Scotland
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Abstract

W-bearing rutile formed during alteration of jarosite by resurgent hydrothermal fluids in the oxide zone of the Kori Kollo gold deposit. The rutile shows sector zoning in basal sections and well developed multiple growth zones, both defined in backscatter electron images by variations in the W content. The maximum WO3 content is 5.3 wt.% and W substitutes for Ti with double substitution of Fe to maintain charge balance. The causes of multiple growth bands are considered to be changes in externally controlled variables occurring in a shallow hydrothermal system. Whereas Ti is probably leached from biotite in dacitic rocks, the W is introduced by hydrothermal fluids.

Keywords

tungstenrutilejarositegold depositsBolivia
Type
Research Article
Information
Mineralogical Magazine , Volume 62 , Issue 3 , June 1998 , pp. 421 - 429
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1998

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