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Cadmium isotopic constraints on metal sources in the Huize Zn–Pb deposit, SW China

Geoscience Frontiers 2021年第6期12卷 162-170页

作者： Chuanwei Zhu Hanjie Wen Yuxu Zhang Zhilong Huang Christophe Cloquet Béatrice Luais Tao Yang State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China University of Chinese Academy of Sciences Beijing 100049China Centre de Recherches Petrographiques et Geochimiques CNRS/UMR 735815Rue Notre-Dame-PauvresB.P.2054501 Vandoeuvre-les-Nancy CedexFrance State Key Laboratory for Mineral Deposits Research Department of Earth SciencesNanjing UniversityNanjing 210093China

The Sichuan–Yunnan–Guizhou(SYG)Zn–Pb metallogenic zone in SW China contains>400 carbonatehosted hydrothermal Zn–Pb *** of these,such as the Huize,Tianbaoshan,and Daliangzi deposits,are super-large deposits with significant reserves of cd,Ge,and ***,the sources of these metals remain *** study investigated the cd isotopic geochemistry of the Huize deposit,the largest Zn–Pb deposit in the SYG *** formed at three stages in the deposit have different colors:black or dark brown(Stage I),red(Stage II),and light-yellow(Stage III).The d^(114/110)cd values of the sphalerites are in the order Stage IIIcd values in the early formed Stage I sphalerites than in laterformed Stage II sphalerites,with cooling of ore-forming fluids being responsible for the still lower values of the Stage III *** galena,the δ^(114/110)cd values are inversely correlated with cd contents and tend to be higher in high-Zn *** speculate that cd isotopic fractionation was significant during the precipitation of sphalerite and galena,with light cd isotopes being enriched in galena rather than *** of the cd isotopic signatures and Zn/cd ratios of different endmembers suggests that the δ^(114/110)cd values and Zn/cd ratios of sphalerite from the Huize deposit,as well as other largescale deposits from the SYG area,are lie in those range of Emeishan basalts and sedimentary rocks and the mean δ^(114/110)cd values of these deposits show good negative correlation with 1/cd,suggesting that the ore-forming materials of these deposits were derived from the mixing of Emeishan basalts and sedimentary *** study demonstrates that cd isotopes can be useful proxies in elucidating ore genesis in large Zn–Pb deposits.

关键词： cd isotopes Sulfide Hydrothermal system Huize Zn–Pb deposit

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