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Genesis of the Linghu Au deposit in Xiaoqinling Region, Henan province, China: Constraints from fluid inclusions and isotope systematics

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Abstract

The Linghu Au deposit is located within the northeastern part of the Xiaoqinling region in the southern margin of the North China Craton. Field investigations, cross-cutting relationships, and mineral paragenetic associations have identified three stages of hydrothermal activity. To determine the origin and evolution of ore-forming fluids, and better understand genesis of the Linghu Au deposit, we have undertaken a series of studies including fluid inclusion and He–Ar–H–O–S–Pb isotope systematics. Fluid inclusion study indicates that the early stage of gold mineralization was characterized by a high-temperature and low-salinity H2O–CO2–NaCl hydrothermal fluids that have δD values of – 82.0 to – 78.6‰ and δ18OH2O values of 5.3 to 6.4‰. The intermediate stage of gold mineralization involved moderate temperature H2O–CO2–NaCl hydrothermal fluids with δD and δ18OH2O values of – 92.7‰ to – 87.9‰ and – 1.4‰ to 0‰, respectively. Pyrite samples from this mineralization stage have 3He/4He and 40Ar/36Ar ratios of 0.26–0.31 Ra and 2834.7–4300.6, respectively. The last mineralization stage involved (low-temperature and low-salinity NaCl–H2O system of hydrothermal fluids with relatively lower δD values of – 93.1 to – 92.3‰ and δ18OH2O values of – 5.7 to – 5.2‰. Moreover, sulfides in ores yielded δ34S values of – 3.6 to 5.9‰, with an average of 2.65‰. The sulfides have 206Pb/204Pb ratios of 17.101–17.804, 207Pb/204Pb ratios of 15.438–15.554, and 208Pb/204Pb ratios of 37.438–38.654. The results of fluid inclusions and H–O, S–Pb, and He–Ar isotopes indicate that hydrothermal fluids associated with the early stage of mineralization originated from magmatic fluids, with sulfur and lead being derived from both units of the Taihua Group and a Late Triassic magmatic–hydrothermal system. All of these data indicate that the Linghu gold deposit formed as a result of magmatic–hydrothermal mineralizing processes.

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Acknowledgments

We thank editor and anonymous reviewers for their constructive comments that helped to improve the manuscript. We are grateful to the staff of the Analytical Laboratory in Beijing Research Institute of Uranium Geology, China National Nuclear Corporation (CNNC) for their advice and assistance in the isotope analysis. We appreciate the Key Laboratory of Geological Fluid, Jilin University for providing experimental measuring apparatus of fluid inclusions.

Funding

This work was financially supported by the Geological Survey of China (Project No. DD20201148 and 1212011120771).

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Authors and Affiliations

  1. College of Earth Sciences, Jilin University, Changchun, 130061, China

    Wei Zeng, Zhi-gao Wang, Duo Wan & Feng-yue Sun

  2. Tianjin Center, China Geological Survey, Tianjin, 300170, China

    Wei Zeng, Cheng-dong Li, Reng-an Yu & Jia-ying Wang

  3. No 1 Institute of Geological and Mineral Resources Survey, Henan Geological Bureau, Luoyang, 471023, China

    Jian-chang Xu

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  1. Wei Zeng
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Zeng, W., Wang, Zg., Wan, D. et al. Genesis of the Linghu Au deposit in Xiaoqinling Region, Henan province, China: Constraints from fluid inclusions and isotope systematics. Arab J Geosci 13, 862 (2020). https://doi.org/10.1007/s12517-020-05914-6

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