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Mineralogical aspects of interstratified chlorite-smectite associated with epithermal ore veins: A case study of the Todoroki Au-Ag ore deposit, Japan

Published online by Cambridge University Press:  02 January 2018

T. Yoneda ,
T. Watanabe  and
T. Sato
T. Yoneda*
Affiliation:
Hokkaido University, Sapporo, 060-8628, Japan
T. Watanabe
Affiliation:
Niigata College of Nursing, Joetsu, 943-0147, Japan
T. Sato
Affiliation:
Faculty of Engineering, Hokkaido University, Sapporo, 060-8628, Japan
*
*E-mail: yonet@eng.hokudai.ac.jp
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Abstract

Chlorite (C)-corrensite (Co)-smectite (S) seriesminerals occur as vein constituents in the two epithermal ore veins, the Chuetsu and Shuetsu veins of the Todoroki Au-Ag deposit. The characteristics of the C–Co–S seriesminerals indicate that the clays may be products of direct precipitation from hydrothermal fluids and subsequent mineralogical transformations during and/or after vein formation. The minerals from the Chuetsu vein are characterized by ‘monomineralic’ corrensite showing an extensive distribution throughout the vein, and trioctahedral smectite occurring locally. The Shuetsu vein minerals are characterized by C-Co series minerals which can be divided into three different types: a I type including discrete chlorite with minor amounts of S layers, a II type comprising interstratified C/Co and discrete chlorite, and a III type characterized by segregation structures of C and Co layers. The C-Co series minerals show slightly different spatial distributions in the Shuetsu vein. Different epithermal environments during the vein formations and possible kinetic effects may have played a role in the formation and conversion of Co-C series at the Shuetsu vein and S-Co series at the Chuetsu vein.

Keywords

chlorite-corrensite-smectite series mineralsinterstratified chlorite-corrensite mineralepithermal Au-Ag ore veinenvironmental conditions
Type
Research Article
Information
Clay Minerals , Volume 51 , Issue 4 , September 2016 , pp. 653 - 674
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

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Footnotes

†

This work was originally presented during the session ‘The many faces of chlorite’, part of the Euroclay 2015 conference held in July 2015 in Edinburgh, UK.

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