Geology and geochronology of the Tokuzbay gold deposit in the Chinese Altai: A case study of collision-related orogenic gold deposits in Central Asian Orogenic Belt

Aibai, Abulimiti; Deng, Xiao‐Hua; Pirajno, Franco; Han, Sheng; Liu, Wen Xiang; Li, Xun; Chen, Xi; Wu, Yong‐Shi; Bao, Zhong Lin; Chen, Yanjing

doi:10.1016/j.oregeorev.2021.104261

Cited by 8 publications

(1 citation statement)

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“…Our investigation suggests that the Yu'erya gold deposit has the characteristics of an orogenic gold deposit, which include (1) the Yu'erya gold mineralization is located at the northern margin of the North China Craton, being related to the subduction of the Mongolia‐Okhotsk Ocean and the Paleo‐Pacific Ocean (Liu et al, 2016); (2) the orebodies are controlled by the ENE‐ and NNE‐trending faults (Chen et al, 2014); (3) wall‐rock alteration is characterized by the existence of silica, carbonate, pyrite, sericite and gold in crosscutting veins, indicating multistage mineralization; (4) the ore‐forming fluid is characterized by low salinity and CO 2 richness, which is common in orogenic Au deposits; (5) the estimated trapping pressure and depth is 203–284 MPa and 7.1–9.9 km, which are consistent with the global orogenic gold deposits, i.e., the Huachanggou gold deposit in the Xiaoqinling (Zhou et al, 2014), the Jianchaling gold deposit in the West Qinling (Yue et al, 2017), the Shangong gold deposit in the East Qinling (Chen et al, 2008), the Tokuzbay gold deposit in the Altai orogen (Aibai et al, 2023) and the Dunbasitao gold deposit in the East Junggar (Liu et al, 2024). Thus, these characteristics indicate that the Yu'erya gold deposit can be classified as an orogenic gold deposit.…”

Section: Discussionsupporting

confidence: 63%

Genesis of the Yu'erya gold deposit, East Hebei, China: Insights from geology and fluid inclusions

Wang,

Deng,

Zhang

et al. 2024

Geological Journal

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The Yu'erya gold deposit is a large‐scale gold deposit in eastern Hebei. However, the ore genesis is controversial because the gold orebody is closely related to biotite granite in time and space. The hydrothermal processes of the Yu'erya gold deposit can be divided into early quartz (Q1)‐pyrite stage, middle quartz (Q2)‐sulphide stage and late quartz (Q3)‐calcite stage. The Q1 is subdivided into Q1‐1 and Q1‐2 generations by SEM‐CL images, and Q2 is subdivided into Q2‐1 and Q2‐2 generations. Three types of fluid inclusions (FIs), including aqueous‐carbonic type (C‐type), aqueous‐rich type (W‐type) and vapour‐rich type (V‐type), were observed in the Yu'erya gold deposit. The Q1‐1 is dominated by C‐type inclusions, and the other quartz is dominated by W‐type inclusions. Laser Raman analysis shows that the initial ore‐forming fluids mainly belong to the CO2‐H2O‐NaCl system and gradually transferred to the H2O‐NaCl system. The C‐type inclusions of Q1‐1 show the salinity of 3.1–10.1 (av. 6.9 ± 1.7) wt.% NaCl eqv., and the total homogenization temperature (Th) of 305–391°C. The homogenization temperature decreases gradually from the early to the late stage, with insignificant change in salinity, indicating that fluid cooling is the main precipitation mechanism. Trapping pressures of C‐type FIs are estimated at 206–284 MPa and 203–211 MPa for the early and middle stages, corresponding to the mineralization depths of 7.2–9.9 km and 7.1–7.4 km, respectively. The FIs in the early stage indicate that the initial ore‐forming fluids are characterized by low salinity and CO2 richness, which are different from those of the intrusion‐related gold deposits, but consistent with the orogenic gold deposits.

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