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Strontium isotopic geochemistry of Tianqiao Pb-Zn deposit, Southwest China
Song Dou;  Jishun Liu;  Jiaxi Zhou
2014
Source PublicationChinese Journal of Geochemistry
Volume33Issue:2Pages:131-137
Abstract

Tianqiao carbonate-hosted Pb-Zn deposit, controlled by NW-trending F37 thrust fault and NW-trending Tianqiao anticline, is located in the eastern part of Sichuan-Yunnan-Guizhou (SYG) Pb-Zn metallogenic province, southwestern Yangtze Block, southwest China. Ore bodies in this deposit are hosted in the Devonian-Carboniferous carbonate rocks, and ore minerals include sphalerite, galena and pyrite, while the gangue minerals are dominated by calcite and dolomite. Using high-precision solid thermal ionization mass spectrometry (TIMS), this paper reports the strontium isotopic compositions (0.7119 to 0.7167) of sulfide samples from the Tianqiao deposit in order to trace the origin of hydrothermal fluids. Compared with the country rocks, the calculated 87Sr/86Sr200 Ma values of sulfide range from 0.7118 to 0.7130, higher than those of the age-corrected Devonian to Permian sedimentary rocks (0.7073 to 0.7101) and the Middle Permian Emeishan flood basalts (0.7078 to 0.7039), but lower than those of the age-corrected Proterozoic basement rocks (such as the Kunyang and Huili Groups, 87Sr/86Sr200 Ma=0.7243 to 0.7288). This implies a mixed strontium source between the older basement rocks and the younger cover sequences. Together with geologic and previous isotopic evidences, we considered that the fluids’ mixing is a possible mechanism for sulfide precipitation in the Tianqiao deposit.

KeywordStrontium Isotope Fluids Mixing Tianqiao Pb-zn Deposit Southwest China
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8321
Collection矿床地球化学国家重点实验室
Affiliation1.School of Geosciences and Info-physics, Central South University, Changsha 410083, China
2.School of Geosciences and Info-physics, Central South University, Changsha 410083, China
3.Yunnan Nonferrous Metals Geological Bureau, Kunming 650051, China
Recommended Citation
GB/T 7714
Song Dou;Jishun Liu;Jiaxi Zhou. Strontium isotopic geochemistry of Tianqiao Pb-Zn deposit, Southwest China[J]. Chinese Journal of Geochemistry,2014,33(2):131-137.
APA Song Dou;Jishun Liu;Jiaxi Zhou.(2014).Strontium isotopic geochemistry of Tianqiao Pb-Zn deposit, Southwest China.Chinese Journal of Geochemistry,33(2),131-137.
MLA Song Dou;Jishun Liu;Jiaxi Zhou."Strontium isotopic geochemistry of Tianqiao Pb-Zn deposit, Southwest China".Chinese Journal of Geochemistry 33.2(2014):131-137.
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