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Geoscience ›› 2024, Vol. 38 ›› Issue (01): 128-153.DOI: 10.19657/j.geoscience.1000-8527.2023.082

• Mineralogy, Petrology, Ore Deposits • Previous Articles     Next Articles

Genesis and Tectonics of the Sipingshan Gold Deposit in Nadanhada Terrane, Sikhote-Alin Orogen: Constraints from Zircon U-Pb Chronology, Petrological and Fluid Geochemistry

HE Yunlong1(), ZHANG Guobin1,2(), YANG Yanchen3, FENG Yue1, KONG Jingui1, CHEN Xingkai4   

  1. 1. School of Mines, Liaoning Technical University, Fuxin, Liaoning 123000, China
    2. Department of Earth Science and Engineering, Shanxi Institute of Technology, Yangquan, Shanxi 045000, China
    3. College of Earth Sciences, Jilin University, Changchun, Jilin 130061, China
    4. Jiangsu Coal Geophysical Prospecting and Surveying Team, Nanjing, Jiangsu 210000, China
  • Received:2023-05-08 Revised:2023-08-15 Online:2024-02-10 Published:2024-03-20

Abstract:

The Sipingshan gold deposit is located in the east Nadanhada terrane, which is the largest gold deposit in the terrane with a proven gold resource of 5.8 t in Hulin City, Heilongjiang Province.The ore body occurs in the cherts and silicified breccias in Sipingshan Formation, and the rhyolite in Datashanlinchang Formation.In this study, we aim to understand the metallogenic process and diagenetic and metallogenic geodynamics, and further determine the diagenetic and metallogenic ages.We conducted detailed field survey on the Sipingshan gold deposit and sampled the cherts and silicified breccias in Sipingshan Formation and rhyolite in Datashanlinchang Formation.Further, we carried out the zircon U-Pb dating using LA-ICP-MS technique and whole-rock major and trace element geochemistry on the ore-bearing surrounding rocks, and additionally we performed the thermodynamic analysis on the fluid inclusions in the gold-bearing quartz veins.The results indicate that the diagenetic ages of the rhyolite samples SPS-H-002 and SPS-H-009 in Datashanlinchang Formation are (134±1) Ma and (123±1) Ma, respectively.The gold mineralization age is slightly later than the that of the rhyolites, belonging to the late Early Cretaceous.Cherts and silicified breccias have a high SiO2 content, rich in Cu, Ni, and Ba elements but poor in Co element.Rare earth elements (REE) content is relatively lower in the rocks and the concentration difference between the light and heavy rare earth elements is not significant, with a europium positive anomaly possibly caused by hydrothermal sedimentation.Rhyolite belongs to a type of rock from subalkaline peraluminous calc-alkaline to high potassium calc-alkaline series, with high Si and Al contents but poor in Ti, Mn, P, and Zr contents.Those rocks are enriched in light REE but deficient in heavy REE, with an pronounced Eu negative anomaly but no Ce anomaly.They belong to highly differentiated S-type granite and may be the product of partial melting of young crustal material with depleted mantle accretion.The fluid inclusions in the gold-bearing quartz veins range from 5 to 12 μm in size, and with elliptical and irregular shapes in group or isolated distribution.Fluid inclusion study results in a homogeneous temperature of 119-223 ℃, salinity of 0.40%-8.9%, density of 0.84-0.97 g/cm3, and capture pressure of 21.2-51.4 MPa.The δD value of the gold-bearing quartz ranges from -113.8‰ to -84.0‰ and the δ18$O_{H_{2}O}$ value ranges from -3.1‰ to 2.2‰. The stable isotopes indicate that the ore-forming fluid has a magmatic origin and shows mixing characteristics of magmatic and meteoric water sources.Combined with the findings from the regional tectonic evolution, it can be concluded that the Sipingshan gold deposit was formed during the post collision and the gold mineralization is closely related to the subduction of the Pale-Pacific plate.

Key words: Nadanhada terrane, Sipingshan gold deposit, zircon geochronology, geochemistry, Pale-Pacific plate, metallogenic tectonics

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