Ore genesis of the Wusihe carbonate-hosted Zn-Pb deposit in the Dadu River Valley district, Yangtze Block, SW China: evidence from ore geology, S-Pb isotopes, and sphalerite Rb-Sr dating

The Wusihe carbonate-hosted Zn-Pb deposit (3.7 Mt. Zn + Pb at a grade of 8.6% Zn and 2.0% Pb) is the largest deposit in the Dadu River Valley district of the Sichuan-Yunnan-Guizhou metallogenic province of southwest China. Three types of orebodies occur: (1) stratiform, banded and lamellar, within d...

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Bibliographic Details
Published in:Mineralium deposita 2018-10, Vol.53 (7), p.967-979
Main Authors: Xiong, Suo-Fei, Gong, Yong-Jun, Jiang, Shao-Yong, Zhang, Xiao-Jing, Li, Qian, Zeng, Guo-Ping
Format: Article
Language:English
Subjects:
Bitumens
Breccia
Calcite
Carbonates
Dolomite
Dolostone
Earth and Environmental Science
Earth Sciences
Galena
Geochemistry
Geology
Isotopes
Lead isotopes
Mineral Resources
Mineralization
Mineralogy
Pyrite
Pyrrhotite
Ratios
River valleys
Rivers
Rubidium-strontium dating
Sphalerite
Zinc
Zincblende
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Summary:The Wusihe carbonate-hosted Zn-Pb deposit (3.7 Mt. Zn + Pb at a grade of 8.6% Zn and 2.0% Pb) is the largest deposit in the Dadu River Valley district of the Sichuan-Yunnan-Guizhou metallogenic province of southwest China. Three types of orebodies occur: (1) stratiform, banded and lamellar, within dolomite of the Neoproterozoic Dengying Formation; (2) vein type; and (3) breccia type. Four stages of mineralization are distinguished: (i) pyrite stage, (ii) pyrite-pyrrhotite-galena-sphalerite-bitumen stage, (iii) sphalerite-galena stage, and (iv) bitumen-calcite stage. Sphalerite and galena from stages II and III show δ 34 S ranges from +7.1 to +9.7‰ and +9.1 to +13.1‰, respectively. High-precision in situ lead isotope analyses of sulfides show 208 Pb/ 204 Pb, 207 Pb/ 204 Pb, and 206 Pb/ 204 Pb ratios of 37.938 to 38.336, 15.579 to 15.682, and 17.951 to 18.195, respectively, which suggest a mixing of lead from the basement and the host rocks. Rb-Sr isotope analyses for six sphalerite samples of stage II yielded an isochron age of 411 ± 10 Ma (MSWD = 1.4). Combining all available ore geology and geochemical data, together with fluid inclusion data reported previously, we suggest that the Wusihe deposit is a Mississippi Valley-type (MVT) deposit.
ISSN:0026-4598
1432-1866
DOI:10.1007/s00126-017-0776-y