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Geochemical Journal
Geochemical Journal An open access journal for geochemistry
Published for geochemistry community from Geochemical Society of Japan.

Absolute and relative dating of Cu and Pb-Zn mineralization in the Baiyangping area, Yunnan Province, SW China: Sm-Nd geochronology of calcite

Zhichao Zou, Ruizhong Hu, Xianwu Bi, Liyan Wu, Caixia Feng, Yongyong Tang
Geochemical Journal, Vol. 49, No. , P. 103-112, 2015

ABSTRACT

The distribution of epithermal base metal deposits in the Lanping basin, Yunnan province, SW China is controlled by Cenozoic thrust-nappe systems. The Baiyangping and Wudichang Ag-bearing polymetallic deposits are representative of the epithermal base metal deposits in the Lanping basin. Hydrothermal calcites associated with base metal sulfides in these two deposits yield similar Sm-Nd isochron ages of 30.1 ± 1.9 to 27.4 ± 1.8 Ma, respectively. These results indicate that the ages of mineralization of the Baiyangping Cu-Ag-Co and Wudichang Pb-Zn-Ag ore deposits are contemporaneous with the Cenozoic Indo-Asian continental collision. Such temporal correlation, combined with the apparent regional structural control of the distribution of these type of deposits suggests that Cenozoic thrust-nappe tectonics and associated hydrothermal activity played an important role in the formation of the epithermal Ag-bearing polymetallic base metal ore deposits in the Lanping basin.

KEYWORDS

Sm-Nd isotope systematics, hydrothermal calcite, epithermal base metal deposits, Baiyangping deposit, Wudichang deposit, Lanping basin, Yunnan

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