阿尔泰南缘乌拉斯沟铜矿床S-Pb-Sr-Nd-C-H-O同位素特征及其对成矿物质和流体来源限定

卢琦园; 郑义; 王成明; 王岳军

doi:10.3799/dqkx.2018.135

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

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

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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

Lu Qiyuan^{1,2
,},
Zheng Yi^{1,2
,
,},
Wang Chengming^1,2,
Wang Yuejun^1,2

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

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 δ¹³C_V-PDB‰=-1.1‰ and δ¹⁸O_V-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 I_{Sr(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 δD_V-SMOW values of the fluid range from -103.8‰ to -92‰ (average -99.2‰), the δ¹⁸O_V-SMOW values for quartz and calcite are concentrated at 9.4‰-11.5‰ (average 10.4‰), and the δ¹⁸O_H₂O 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.
- Wulasigou Cu deposit,
- orogenic deposit,
- Altay orogenic belt,
- isotope,
- geochemistry

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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

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