The giant Upper Yangtze Pb-Zn province in SW China: Reviews, new advances and a new genetic model

被引:110
作者
Zhou, Jia-Xi [1 ,3 ,4 ]
Xiang, Zhen-Zhong [1 ,2 ]
Zhou, Mei-Fu [3 ]
Feng, Yue-Xing [4 ]
Luo, Kai [1 ,2 ]
Huang, Zhi-Long [1 ]
Wu, Tao [4 ,5 ]
机构
[1] Chinese Acad Sci, Inst Geochem, Stake Key Lab Ore Deposit Geochem, Guiyang 550081, Guizhou, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[3] Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China
[4] Univ Queensland, Sch Earth & Environm Sci, Radiogen Isotope Facil, Brisbane, Qld 4072, Australia
[5] Zhejiang Univ, Sch Earth Sci, Hangzhou 310027, Peoples R China
基金
中国国家自然科学基金;
关键词
NanoSIMS in situ S isotopes; fs LA-MC-ICPMS in situ Pb isotopes; Bulk C-O-S-Zn and Pb-Sr isotopes; The Upper Yangtze Pb-Zn metallogenic; province; South China; THERMOCHEMICAL SULFATE REDUCTION; LARGE IGNEOUS PROVINCE; LEAD-ZINC DEPOSITS; IN-SITU PB; HYDROTHERMAL ORE-DEPOSITS; SULFUR ISOTOPE ANALYSIS; BASE-METAL DEPOSITS; SOUTHWEST CHINA; RB-SR; SICHUAN PROVINCE;
D O I
10.1016/j.jseaes.2017.12.032
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
In the western margin of the Yangtze Block, SW China, the Emeishan large igneous province (ELIP) is spatially associated with > 400 carbonate-hosted epigenetic Pb-Zn deposits. These deposits form the giant Upper Yangtze Pb-Zn metallogenic province with > 20 Mt base metals. In the southeastern part of this province, the important Pb-Zn deposits include those of the Yinchangpo, Yunluhe, Maozhachang, Tianqiao, Banbanqiao, Mangdong, Shaojiwan, Liangyan, Qingshan, Shanshulin, Nayongzhi and Guanziyao deposits. Sulfide ore bodies in these deposits are (i) hosted in late Ediacaran to middle Permian limestone, dolomitic limestone and dolostone; (ii) structurally controlled by reverse fault-anticline tectonic systems; and (iii) spatially associated with the ELIP flood basalts and mafic dikes, and early Permian, early Carboniferous and early Cambrian organic matter-rich black shales. C-O isotopic compositions suggest that dolostone and limestone, mantle-derived rocks of the ELIP, and sedimentary organic matters supplied C-O to the hydrothermal systems through water/rock (W/R) interaction. New and existing S isotopic compositions of sulfides imply multiple sources of S and the reduction of sulfate through both abiotic thermochemical (TSR) and bacterially mediated (BSR) processes. Zn isotopes indicate that the sources of Zn were most likely related to the ELT with various contributions from sediments and basements locally. Pb isotope signatures are suggestive of derivation of Pb from basements and sedimentary rocks with variable influences from the ELIP. Sr isotopes support that mantle-derived rocks, sediments and basements were involved in Pb-Zn mineralization, and they have various contributions in different deposits. We consider that the Pb-Zn deposits in the Upper Yangtze province are the mixed products of multiple S species bearing solutions and metal-rich fluids, both of which were derived from, flowed through or interacted with multiple lithostratigraphic units in the western Yangtze Block. The change of tectonic regimes from extension to compression after eruption of basalts of the ELT, and then to extension during Early Mesozoic, facilitated extraction, migration, and excretion of ore-forming metals and associated fluids. Mixing of fluids and reduction geochemical barrier activated TSR, causing cyclical carbonate dissolution, CO2 degassing and recrystallization (namely carbonate buffer). All these processes triggered continuous precipitation of huge amounts of hydro thermal minerals. Underplating and eruption of ELT basalts provided heat flow, fluids and volatiles, whereas the basalts acted as an impermeable and protective layer, and even as ore-hosting rocks. These Pb-Zn deposits have spatial and genetic association with igneous activities of the ELIP, and are characterized by high ore grades ( > 10 wt% Pb + Zn), high concentrations of associated metals (e.g. Cu, Ag, Ge, and Cd), and medium-low temperatures (usually < 300 degrees C) and salinities (commonly < 20 wt% NaCl equiv.), all of which are significantly different from those of typical Mississippi Valley-type (MVT) deposits. Hence, the carbonate-hosted epigenetic Pb-Zn deposits in the Upper Yangtze metallogenic province representing to a new type of Pb-Zn deposits that are hosted in platform carbonate sequences and formed within compressional zones of passive margin tectonic settings.
引用
收藏
页码:280 / 315
页数:36
相关论文
共 180 条
  • [1] The stable isotope geochemistry of copper and zinc
    Albarède, F
    [J]. GEOCHEMISTRY OF NON-TRADITIONAL STABLE ISOTOPES, 2004, 55 : 409 - 427
  • [2] Emeishan large igneous province, SW china
    Ali, JR
    Thompson, GM
    Zhou, MF
    Song, XY
    [J]. LITHOS, 2005, 79 (3-4) : 475 - 489
  • [3] [Anonymous], 2002, EARTH PLANET SC LETT
  • [4] [Anonymous], J GUILIN COLL GEOL
  • [5] [Anonymous], 1999, Study on the Law of Pb-Zn-Ag Ore Deposit in Northeast Yunnan, China
  • [6] [Anonymous], 2021, Stable isotope geochemistry
  • [7] Isotopic Compositions of Sulfur in the Jinshachang Lead-Zinc Deposit Yunnan, China, and its Implication on the Formation of Sulfur-Bearing Minerals
    Bai Junhao
    Huang Zhilong
    Zhu Dan
    Yan Zaifei
    Zhou Jiaxi
    [J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION, 2013, 87 (05) : 1355 - 1369
  • [8] Non-matrix-matched determination of lead isotope ratios in ancient bronze artifacts by femtosecond laser ablation multi-collector inductively coupled plasma mass spectrometry
    Bao Zhian
    Yuan Wenting
    Yuan Honglin
    Liu Xu
    Chen Kaiyun
    Zong Chunlei
    [J]. INTERNATIONAL JOURNAL OF MASS SPECTROMETRY, 2016, 402 : 12 - 19
  • [9] Metal source of giant Huize Zn-Pb deposit in SW China: New constraints from in situ Pb isotopic compositions of galena
    Bao, Zhiwei
    Li, Qun
    Wang, Christina Yan
    [J]. ORE GEOLOGY REVIEWS, 2017, 91 : 824 - 836
  • [10] Barker SLL, 2009, ECON GEOL, V104, P897