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Ba-rich micas from the Yindongzi-Daxigou Pb-Zn-Ag and Fe deposits, Qinling, northwestern China

Published online by Cambridge University Press:  05 July 2018

Shao-Yong Jiang ,
M. R. Palmer ,
Yan-He Li  and
Chun-Ji Xue
Shao-Yong Jiang
Affiliation:
Department of Geology, University of Bristol, Bristol, BS8 1RJ, UK
M. R. Palmer
Affiliation:
Department of Geology, University of Bristol, Bristol, BS8 1RJ, UK
Yan-He Li
Affiliation:
Institute of Mineral Deposits, Beijing, 100037, China
Chun-Ji Xue
Affiliation:
Xi'an College of Geology, Xi'an, 710054, China
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Abstract

Electron-microprobe analyses of muscovite, biotite, and feldspar are reported for the stratiform Yindongzi—Daxigou Pb—Zn—Ag and Fe deposits of Qinling, northwestern China. The micas are characterized by high Ba levels in banded albite-carbonate rocks that host the deposits. The biotite is also rich in Cl, as is biotite in the nearby Tongmugou Pb-Zn deposit, although biotite and muscovite from this deposit lack Ba enrichment. It is likely that the Ba-rich micas in the Yindongzi-Daxigou deposits formed contemporaneously from the diagenesis and/or regional metamorphism of hydrothermally altered clay minerals, with the barium being derived from entrained pore fluids that may represent relict hydrothermal fluids associated with ore deposition. During the formation of coexisting muscovite and biotite, barium is preferentially partitioned into muscovite and chloride into biotite. Together with the presence of baryte rocks in the bedded ores, these data suggest that ore deposition in the Yindongzi—Daxigou deposits took place in a more oxidising environment than in the nearby Tongmugou deposit. This difference is attributed to the contrasting sedimentary environments of the two deposits, with the Yindongzi—Daxigou deposits having formed under shallow, oxic conditions and the Tongmugou deposit under deeper, anoxic conditions.

Keywords

barian muscovitebarian chlorian biotitebanded chemical rocksPb—Zn—Ag depositsFe depositChina
Type
Mineralogy
Information
Mineralogical Magazine , Volume 60 , Issue 400 , June 1996 , pp. 433 - 445
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1996

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