Ore-forming fluid characteristics and ages of the Xinan Cu-Mo deposit at Zijinshan orefield, SE China: New insights for metallogenic mechanism and exploration

被引:0
作者
Wang, Xuena [1 ,2 ]
Wu, Chao [1 ,3 ]
Xiao, Bing [1 ,3 ]
Xu, Chao [1 ]
Yu, Xiaoliang [4 ,5 ]
Lai, Xiaodan [6 ]
机构
[1] Chinese Acad Sci, Key Lab Mineral & Metallogeny, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[3] Guangdong Prov Key Lab Mineral Phys & Mat, Guangzhou 510640, Peoples R China
[4] Geol Survey Bur Qinghai Prov, Xining 810001, Peoples R China
[5] Minist Nat Resources, Technol Innovat Ctr Explorat & Exploitat Strateg M, Xining 810001, Peoples R China
[6] Zijin Min Grp Co Ltd, Longyan 364200, Peoples R China
基金
中国国家自然科学基金;
关键词
Zijinshan orefield; Xinan Cu-Mo deposit; Geochronology; Fluid inclusion; Mineralization mechanism; PORPHYRY COPPER-DEPOSIT; CRUST-MANTLE INTERACTION; PB-ZN DEPOSIT; SOUTH CHINA; FUJIAN PROVINCE; SOUTHEASTERN CHINA; AU DEPOSIT; GOLD MINERALIZATION; GEOCHEMICAL CHARACTERISTICS; HYDROTHERMAL EVOLUTION;
D O I
10.1016/j.oregeorev.2024.106061
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
The Xinan deposit, a newly discovered porphyry Cu-Mo deposit in the Zijinshan orefield, Fujian Province, exhibits distinct alteration and porphyry mineralization stages, including the potassic, propylitic, and phyllic alteration stages. The phyllic stage is further divided into molybdenite, chalcopyrite, and pyrite sub-stages. Molybdenite Re-Os model age (108.3 +/- 1.1 Ma) and concomitant sericite Ar-40/Ar-39 plateau age (109.0 +/- 6.0 Ma) indicate that the Xinan Cu-Mo deposit was formed at 109 similar to 108 Ma. Four types of fluid inclusions have been identified at the Xinan deposit, including vapor-rich, liquid-rich, and opaque daughter mineral-bearing subtypes with minor transparent daughter mineral-bearing subtypes. Fluid inclusion microthermometry measurements reveal that the potassic alteration stage exhibits homogenization temperatures of 375-475 degrees C and salinities range of 4-20 wt% NaCl eqv., suggesting slight fluid boiling. Chlorite geothermometer suggests temperatures of the propylitic alteration stage range from 261 to 336 degrees C, averaging at 303 degrees C. The molybdenite, chalcopyrite, and pyrite sub-stages have homogenization temperatures of 325-400 degrees C, 325-350 degrees C, and 300-350 degrees C, respectively, with corresponding salinities of 2-10 wt% NaCl eqv., 4-8 wt% NaCl eqv., and 2-4 wt% NaCl eqv.. The Laser Raman spectroscopy results show that the fluid inclusions in the Xinan deposit consist of H2O with minor CO2, hematite, chalcopyrite, and halite. The evolution of the ore-forming fluids in the Xinan porphyry Cu-Mo deposit is characterized by a transition from high-temperature, low- to moderate-salinity, oxidized, and CO2-bearing conditions during the potassic alteration stage, to moderate- to high-temperature and low-salinity conditions during the propylitic alteration stage. The subsequent phyllic alteration stage, which overprints on the potassic and partial propylitic alteration stages, is marked by moderate- to high-temperature, low-salinity, and low-oxygen fugacity environments. The primary mechanisms driving mineralization in the Xinan porphyry Cu-Mo deposit are thus identified as the reduction in temperature and oxygen fugacity, coupled with CO2 escape. In contrast to the Luoboling-Jintonghu porphyry Cu-Mo deposit, the ore-forming fluid of the Xinan deposit is characterized by lower temperatures, salinity, and CO2 contents, and reduced fluid boiling. This suggests a relatively subdued porphyry-type mineralization. The lack of a distinct potassic alteration zone in the Xinan Cu-Mo deposit suggests the potential existence of a deeper, higher temperature and salinity porphyry mineralization center beneath this deposit.
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页数:17
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共 136 条
  • [91] [谭靖 TAN Jane], 2007, [矿物学报, Acta Mineralogica Sinica], V27, P173
  • [92] Gold concentrations of magmatic brines and the metal budget of porphyry copper deposits
    Ulrich, T
    Günther, D
    Heinrich, CA
    [J]. NATURE, 1999, 399 (6737) : 676 - 679
  • [93] Ulrich T, 2001, ECON GEOL BULL SOC, V96, P1743
  • [94] Early Cretaceous Extensional-tectonism-related petrology of the Gan-Hang Belt SE China: Lingshan A-type granite at ca. 130 Ma
    Wang, Cunzhi
    Zhao, Xilin
    Huang, Zhizhong
    Xing, Guangfu
    Wang, Lianxun
    [J]. GEOLOGICAL JOURNAL, 2018, 53 (06) : 2487 - 2506
  • [95] Petrogenesis of adakitic porphyries in an extensional tectonic setting, dexing, South China: Implications for the genesis of porphyry copper mineralization
    Wang, Q
    Xu, JF
    Jian, P
    Bao, ZW
    Zhao, ZH
    Li, CF
    Xiong, XL
    Ma, JL
    [J]. JOURNAL OF PETROLOGY, 2006, 47 (01) : 119 - 144
  • [96] Wang Shaohuai, 2009, Dizhi Xuebao, V83, P145
  • [97] Phanerozoic tectonics of the South China Block: Key observations and controversies
    Wang, Yuejun
    Fan, Weiming
    Zhang, Guowei
    Zhang, Yanhua
    [J]. GONDWANA RESEARCH, 2013, 23 (04) : 1273 - 1305
  • [98] Multiple mineralization events of the Paleozoic Tuwu porphyry copper deposit, Eastern Tianshan: evidence from geology, fluid inclusions, sulfur isotopes, and geochronology
    Wang, Yunfeng
    Chen, Huayong
    Baker, Michael J.
    Han, Jinsheng
    Xiao, Bing
    Yang, Juntao
    Jourdan, Fred
    [J]. MINERALIUM DEPOSITA, 2019, 54 (07) : 1053 - 1076
  • [99] Linking Pacific Plate formation and Early Cretaceous metallogenic response on the circum-Pacific continental margins
    Wu, Chao
    Chen, Huayong
    Chiaradia, Massimo
    Huangfu, Pengpeng
    Li, Zhonghai
    [J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN, 2024, 136 (1-2) : 171 - 183
  • [100] Paragenesis and fluid evolution of the Halasu III porphyry Cu deposit, East Junggar (NW China): Implications for the Paleozoic multiphase superimposing mineralization in the Central Asian Orogenic Belt
    Wu, Chao
    Chen, Huayong
    Liang, Pei
    Han, Jinsheng
    Liu, Zhenjiang
    Fang, Jing
    Xu, Deru
    [J]. ORE GEOLOGY REVIEWS, 2018, 100 : 183 - 204