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Precise Sm–Nd and U–Pb isotopic dating of the supergiant Shizhuyuan polymetallic deposit and its host granite, SE China

Published online by Cambridge University Press:  21 April 2004

XIAN-HUA LI ,
DUNYI LIU ,
MIN SUN ,
WU-XIAN LI ,
XI-RONG LIANG  and
YING LIU
XIAN-HUA LI
Affiliation:
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, P.O. Box 1131, Guangzhou 510640, China Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, China
DUNYI LIU
Affiliation:
Beijing SHRIMP Centre, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 10037, China
MIN SUN
Affiliation:
Department of Earth Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, China
WU-XIAN LI
Affiliation:
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, P.O. Box 1131, Guangzhou 510640, China
XI-RONG LIANG
Affiliation:
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, P.O. Box 1131, Guangzhou 510640, China
YING LIU
Affiliation:
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, P.O. Box 1131, Guangzhou 510640, China
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Abstract

The supergiant Shizhuyuan W–Sn–Bi–Mo deposit is hosted by the Qianlishan granite, a small, highly fractionated granitic pluton (∼10 km2) with multiple phases of intrusions within the Early Yanshanian granitoid province of SE China. Strong alteration of skarn and greisen that formed in the contact zone between the first and second phases of granite intrusions and Devonian limestone is responsible for the polymetallic mineralizations. SHRIMP U–Pb zircon analysis indicates that the two early phases of the Qianlishan granite formed contemporaneously at 152±2 Ma. Metasomatic minerals (garnet, fluorite and wolframite) separated from the skarn and greisen yield a Sm–Nd isochron age of 149±2 Ma that is interpreted as the formation age of the Shizhuyuan deposit. Therefore, the mineralization of the supergiant Shizhuyuan polymetallic deposit formed contemporaneously with, or very shortly after, the intrusion of the small, highly fractionated Qianlishan granite.

Keywords

Sm–NdU–PbgeochronologygraniteSouth China Block
Type
Original Article
Information
Geological Magazine , Volume 141 , Issue 2 , March 2004 , pp. 225 - 231
Copyright
© 2004 Cambridge University Press

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