Characteristics of Ore‐forming Fluid of the Gaoshan Gold‐Silver Deposit in the Longquan Area, Zhejiang Province and its Implications for the Ore Genesis

Acta Geologica Sinica - Tập 90 Số 4 - Trang 1321-1340 - 2016
Biao Jiang1, Wang Chenghui1, Yuchuan Chen2,1, Wu Baogui3, Liao Peng3, Zhengle Chen4, Han Fengbin4
1MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
2Chinese Academy of Geological Sciences, Beijing 100037, China
3No. 7 Geological Team of Zhejiang Province, Lishui, Zhejiang 323000
4Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081

Tóm tắt

AbstractThe Gaoshan gold‐silver deposit, located between the Yuyao‐Lishui Fault and Jiangshan‐Shaoxing fault in Longquan Area, occurs in the Suichang‐Longquan gold‐silver polymetallic metallogenic belt. This study conducted an investigation for ore‐forming fluids using microthermometry, D‐O isotope and trace element. The results show that two types of fluid inclusions involved into the formation of the deposit are pure liquid phase and gas‐liquid phase aqueous inclusions. The homogenization temperature and salinity of major mineralization phase ranges from 156°C to 236°C (average 200°C) and 0.35% to 8.68% (NaCleqv) (average 3.68%), respectively, indicating that the ore‐forming fluid is characteristic of low temperature and low salinity. The ore‐forming pressure ranges between in 118.02 to 232.13′105 pa, and it is estabmiated that the ore‐forming depth ranges from 0.39 to 0.77 km, indicating it is a hypabyssal deposit in genesis. The low rare earth elements content in pyrites, widely developed fluorite in late ore‐forming stage and lack of chlorargyrite (AgCl), indicates that the ore‐forming fluid is rich in F rather than CI. The ratios of Y/Ho, Zr/Hf and Nb/Ta of between different samples have little difference, indicating that the later hydrothermal activities had no effects on the former hydrothermal fluid. The chondrite‐normalized REE patterns of pyrites from country rocks and ore veins are basically identical, with the characteristics of light REE enrichment and negative Eu anomalies, implying that the ore‐forming fluid was oxidative and derived partly from the country rocks. The δD and δ18O of fluid inclusions in quartz formed during the main metallogenic stage range from —105‰ to –69 ‰ and –6.01‰ to –3.81‰, respectively. The D‐O isotopie diagram shows that the metallogenic fluid is characterized by the mixing of formation water and meteoric water, without involvement of magmatic water. The geological and geochemical characteristics of the Gaoshan gold‐silver deposit are similar to those of continental volcanic hydrothermal deposit, and could be assigned to the continental volcanic hydrothermal gold‐silver deposit type.

Từ khóa


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Acta Geologica Sinica

Tập 90 Số 4

1321-1340

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