Volume 43 Issue 9
Sep.  2018
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Article Navigation >  Earth Science  > 2018  >  43(9): 3141-3153
Lu Qiyuan, Zheng Yi, Wang Chengming, Wang Yuejun, 2018. S-Pb-Sr-Nd-C-H-O Isotopic Geochemistry of the Wulasigou Cu Deposit in the South Altay: Constraints for the Fluid and Metal Sources. Earth Science, 43(9): 3141-3153. doi: 10.3799/dqkx.2018.135
Citation: Lu Qiyuan, Zheng Yi, Wang Chengming, Wang Yuejun, 2018. S-Pb-Sr-Nd-C-H-O Isotopic Geochemistry of the Wulasigou Cu Deposit in the South Altay: Constraints for the Fluid and Metal Sources. Earth Science, 43(9): 3141-3153. doi: 10.3799/dqkx.2018.135
shu

S-Pb-Sr-Nd-C-H-O Isotopic Geochemistry of the Wulasigou Cu Deposit in the South Altay: Constraints for the Fluid and Metal Sources

doi: 10.3799/dqkx.2018.135
  • 1.

    School of Earth Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China

  • 2.

    Guangdong Provincial Key Lab of Geological Processes and Mineral Resource Survey, Guangzhou 510275, China

  • Received Date: 2018-01-25
  • Publish Date: 2018-09-15
    Abstract
  • The Wulasigou Cu deposit is a recent discovered ore deposit, located in Devonian volcanic-sedimentary basin of the Altay orogenic belt. Vein-shaped orebodies are hosted in the Kangbutiebao Formation and controlled by the NW-trending faults. In order to investigate the origin of ore-forming fluid and metal, a series of S-Pb-Sr-Nd-C-H-O isotopic analysis was carried out. According to field work and microscopic observation, the mineralization stages of the Wulasigou Cu deposit can be divided into pyrite-magnetite-quartz, chalcopyrite-chlorite-epidote-quartz and quartz-carbonate stages. The δ34S values of sulfide samples in this deposit are 0.1‰-3.2‰ (average:1.6‰), falling into the range of the δ34S values of wall rocks (-4.7‰-18.68‰), indicating that sulfur may be mainly derived from the Kangbutiebao Formation. The calcite sample shows δ13CV-PDB‰=-1.1‰ and δ18OV-PDB‰=-20.3‰, indicating that the marine carbonate strata and organic carbon are probably the sources of carbon. The Pb isotopes of eight pyrite samples are 206Pb/204Pb=17.939-18.508 (average 18.255), 207Pb/204Pb=15.519-15.674 (average 15.578), 208Pb/204Pb=37.881-38.653 (average 38.209), similar to those of the Kangbutiebao Formation. The ISr(220 Ma) values of pyrite are 0.710 4-0.711 7 (average 0.711 1), with initial 143Nd/144Nd values of 0.512 002-0.512 240 (average 0.512 103). The Sr-Nd-Pb isotopic compositions indicate that the metal sources of Wulasigou Cu deposit may be mainly from the Kangbutiebao Formation but with additional minerals. The δDV-SMOW values of the fluid range from -103.8‰ to -92‰ (average -99.2‰), the δ18OV-SMOW values for quartz and calcite are concentrated at 9.4‰-11.5‰ (average 10.4‰), and the δ18OH2O values range from 2.1‰ to 4.2‰ (average 3.1‰), indicating that the hydrothermal fluids may be originated from metamorphic water with the effect of meteoric water combined with physical and chemical characteristics of fluid inclusions. The metallogenic material of the Wulasigou Cu deposit is mainly derived from the metamorphic devolatilization of the host rock, which is consistent with the ore-forming mechanism of the orogenic deposit.

     

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