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Genesis of the Saibagou Gold Deposit in the Northern Margin of Qaidam: Evidence from Fluid Inclusions and H-O-S-Pb Isotopes
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Shengshun SU1, Yong ZHANG1, *, Gui LIN1, Shulan SHU2, Yongle LIU1, Daming ZHANG1, Zhigang LIU1, Furong ZHAO1
Northwestern Geology | 2026, 59(1) : 130 - 145
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Northwestern Geology | 2026, 59(1): 130-145
Genesis of the Saibagou Gold Deposit in the Northern Margin of Qaidam: Evidence from Fluid Inclusions and H-O-S-Pb Isotopes
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Shengshun SU1, Yong ZHANG1, *, Gui LIN1, Shulan SHU2, Yongle LIU1, Daming ZHANG1, Zhigang LIU1, Furong ZHAO1
Affiliations
  • 1The Third Geological Exploration Institute of Qinghai Province, Xining 810029, Qinghai, China
  • 2Bureau of Geology and Mineral Exploration and Development of Qinghai Province, Xining 810008, Qinghai, China
Published: 2026-02-20 doi: 10.12401/j.nwg.2024008
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The Saibagou gold deposit, located in the Wulan area, eastern part of the northern Qaidam metallogenic belt, is one of the representative gold deposits in the northern Qaidam metallogenic belt. Recently, new breakthroughs have been made in prospecting at the deep and peripheral areas, but the genetic mechanism of the deposit is still controversial. Fluid inclusions and H-O-S-Pb isotopes of gold-bearing quartz veins from the Saibagou deposit are examined in this study. The results show that the fluid inclusions in the Saibagou gold deposit are mainly characterized by gas-liquid two-phase inclusions and CO2-bearing three-phase inclusions. The homogenization temperature of the inclusions ranges from 200 ℃ to 320 ℃, the salinity ranges from 0.18% NaCleqv to 14.67% NaCleqv, and the fluid density ranges from 0.67 g/cm3 to 1.13g/cm3. These lines of evidence support an ore-forming fluid characterized by medium temperature, medium-low salinity and low density, and belonging to the H2O-NaCl-CO2 system. The δDV-SMOW values are between −75.1‰ and −65.2‰, and δ18OH2O values are between 2.3‰ and 3.3‰, suggesting that the ore-forming fluid is mainly derived from magmatic water with a small amount of metamorphic fluid. S isotope studies show that δ34S of pyrite is between −2.52‰ and 2.61‰, which is within the composition range of meteorite S, reflecting that the sulfur in the deposit mainly comes from deep mantle, which may be related to magmatic activity. The pyrite 206Pb/204Pb ranges from 18.0314 to 18.2503, the 207Pb/204Pb ranges from 15.5907 to 15.7308, and the 208Pb/204Pb ranges from 38.1726 to 38.4326, indicating that Pb is mainly derived from magmas, and to a lesser extent, the Cambrian-Ordovician strata. Combined with the geological characteristics, fluid inclusions and H-O-S-Pb isotope research results, as well as the regional tectonic evolution background, it can be concluded that the Saibagou gold deposit is an orogenic gold deposit formed by continental collision between the Qaidam Block and Olongbuk Block and its genesis is closely related to the dike activities in the mining area.

fluid inclusion  /  H-O-S-Pb isotope  /  genesis of deposit  /  Saibagou gold deposit  /  northern Qaidam  /  Qinghai Province
苏生顺, 张勇, 林贵, 舒树兰, 刘永乐, 张大明, 刘智刚, 赵芙蓉. 柴北缘赛坝沟金矿床成因探讨：来自流体包裹体及H-O-S-Pb同位素证据. 西北地质, 2026 , 59 (1) : 130 -145 . DOI: 10.12401/j.nwg.2024008
Shengshun SU, Yong ZHANG, Gui LIN, Shulan SHU, Yongle LIU, Daming ZHANG, Zhigang LIU, Furong ZHAO. Genesis of the Saibagou Gold Deposit in the Northern Margin of Qaidam: Evidence from Fluid Inclusions and H-O-S-Pb Isotopes[J]. Northwestern Geology, 2026 , 59 (1) : 130 -145 . DOI: 10.12401/j.nwg.2024008
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Year 2026 volume 59 Issue 1
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Article Info
doi: 10.12401/j.nwg.2024008
  • Receive Date：2023-07-17
  • Online Date：2026-09-16
  • Published：2026-02-20
Article Data
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History
  • Received：2023-07-17
  • Revised：2023-11-27
  • Accepted：2024-01-12
Affiliations
    1The Third Geological Exploration Institute of Qinghai Province, Xining 810029, Qinghai, China
    2Bureau of Geology and Mineral Exploration and Development of Qinghai Province, Xining 810008, Qinghai, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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