A preliminary study on the Mesozoic massive gold metallogenic mechanism of the deep-large fault coupling with critical water in the Jiaodong area, China

HU Baoqun; GAO Haidong; WANG Yun; ZHANG Baolin; LYU Guxian

doi:10.12090/j.issn.1006-6616.2021.27.04.049

Volume 27 Issue 4

Aug. 2021

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Article Navigation > Journal of Geomechanics > 2021 > 27(4): 585-595

HU Baoqun, GAO Haidong, WANG Yun, et al., 2021. A preliminary study on the Mesozoic massive gold metallogenic mechanism of the deep-large fault coupling with critical water in the Jiaodong area, China. Journal of Geomechanics, 27 (4): 585-595. DOI: 10.12090/j.issn.1006-6616.2021.27.04.049

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A preliminary study on the Mesozoic massive gold metallogenic mechanism of the deep-large fault coupling with critical water in the Jiaodong area, China

doi: 10.12090/j.issn.1006-6616.2021.27.04.049

1.
School of Earth Sciences, East China University of Technology, Nanchang 330013, Jiangxi, China
2.
School of Architectural Engineering, Nanchang Institute of Science and Technology, Nanchang 330013, Jiangxi, China
3.
Key Laboratory of Mineral Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
4.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China

Funds:

the National Natural Science Foundation of China 41472069

More Information

Received: 2021-04-30
Revised: 2021-07-07
Published: 2021-08-01

Abstract

Abstract

This study aims to study the reason why a huge accumulation of gold deposits occurred in the Jiaodong area. We summarized and analyzed the geological background and metallogenic characteristics of the Jiaodong gold deposits. In parallel, we highlighted the importance of depressurization-driven movement of ore-forming materials at two stages and the special properties of critical water (water at the critical value of both temperature and pressure, the same below) based on the theory of water phase change controlling metallogenesis in hydrothermal deposits. The above analysis results allow us to propose the Mesozoic massive gold metallogenic mechanism of deep-large fault coupling with critical water in the Jiaodong area, that is, the metallogenic mechanism of "one cake plus one knife". The old metamorphic rocks provide abundant ore-forming materials. In the early stage, a large-scale point-like depressurization results in acid intrusive complexes and various dykes, which were accompanied by a large amount of critical water over a long time to promote the activation and migration of ore-forming materials; In the late stage, the depressurization of the large linear fault caused the precipitation of ore-forming materials in a short time. The faults with open discontinuous space are dominated by ore-filling structures, while the fracture zones with continuous space are dominated by mineralized alteration with metasomatic structures. Abundant gold in metamorphic rocks, two stages of depressurization with different properties and unique properties of critical water are the main factors for the accumulation of massive gold deposits in the Jiaodong area.
- depressurization,
- structural control on rock and ore,
- metallogenic mechanism,
- gold deposit,
- the Jiaodong area

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A preliminary study on the Mesozoic massive gold metallogenic mechanism of the deep-large fault coupling with critical water in the Jiaodong area, China

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A preliminary study on the Mesozoic massive gold metallogenic mechanism of the deep-large fault coupling with critical water in the Jiaodong area, China

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