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Geoscience ›› 2024, Vol. 38 ›› Issue (04): 1043-1053.DOI: 10.19657/j.geoscience.1000-8527.2024.083

• Ore-controlling Mechanism and Exploration Applications of Tectono-physicochemistry • Previous Articles     Next Articles

Metallogenic Characteristics in the Abrupt Change Zone of Tectono-physicochemical Parameters in the Dayin’gezhuang Gold Orefield,Jiaodong Peninsula

WANG Zongyong1(), LÜ Guxian2(), ZHANG Baolin3, LI Yongwu4, MA Shengming5, HAN Xin6, ZHANG Liangliang7, YUAN Yuelei8, LIU Zhifang9, HE Changcheng10   

  1. 1. School of Public Administration,Lanzhou University of Finance and Economics,Lanzhou,Gansu 730000,China
    2. Institute of Geological Mechanics,Institute of Geological Sciences,Beijing 100081,China
    3. Key Laboratory of Mineral Resources,Institute of Geology & Geophysics,Chinese Academy of Sciences,Beijing 100029,China
    4. College of Economics and Management,Beijing University of Technology,Beijing 100124,China
    5. Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang,Hebei 065000,China
    6. School of Resources and Environment,Beibu Gulf University,Qinzhou,Guangxi 535011,China
    7. The 6th Geology and Mineral Resources Survey Institute,Weihai,Shandong 264209,China
    8. State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China
    9. Foshan Geological Bureau of Guangdong Province,Foshan,Guangdong 440600,China
    10. Nanjiang Hydrogeological Engineering Geological Team,Chongqing Geology and Mineral Exploration and Development Bureau,Chongqing 401120,China
  • Online:2024-08-10 Published:2024-10-16
  • Contact: Lü Guxian

Abstract:

In the study of orefields with endogenetic metallogenesis,tectono-deformation lithofacies can not only reflect the characteristics of tectonic stress field during the formation of the deposit but also reveal their geoche-mical features and physicochemical conditions.The Jiaodong gold-concentration area has a unique characteristic among global gold deposits,with its scale of gold reserves ranking third in the world.It is noteworthy that the Dayin’gezhuang orefield is one of the super-large gold fields in this region.Based on previous research on tectonic alteration lithofacies,it is particularly necessary to clarify the relationship among the tectono-physicoche-mistry parameters and to delve into how tectonic processes can drive gold mineralization by influencing the physicochemical conditions of ore formation.This study selected tectono-physicochemical parameters representing the composition,temperature and pressure,properties of ore-forming fluids,and conditions of ore-forming structures in order to analyze tectonic diagenesis and mineralization.The results show that the tectono-physicochemistry conditions represented by fluid inclusion components such as CO2/H2O,pH,oxygen fugacity (lg$f_{0_{2}}$),tectonic additional hydrostatic pressure (Ps),homogenization temperature of fluid inclusion,minimum pressure of fluid inclusion (Pmin),and other parameters have a significant influence on ore formation.The effect of the ore-forming fluid’s composition,properties,temperature and pressure conditions,and the tectonic process represented by CO2/H2O,lg$f_{0_{2}}$,Ps,homogenization temperature,and Pmin are positively correlated,while the effect of pH shows a negative correlation; additionally,in the pyrite-sericite zone,the pyritic-sericitic granitic cataclastic zone,and the strong potassic feldspar granite belt of the ore field,the tectonic additional hydrostatic pressure (Ps),fluid inclusion component CO2/H2O,oxygen fugacity (lg$f_{0_{2}}$),minimum pressure of fluid inclusion (Pmin),and homogenization temperature of fluid inclusions exhibit a trend of initially increasing and then decreasing.The ore-forming physical and chemical conditions represented by fluid inclusion component Na+/K+ and F-/Cl- have a negative correlation with ore formation.In the pyrite-sericite zone,pyritic-sericitic granitic cataclastic zone,and strong potassic feldspar granite belt,F-/Cl-demonstrate a gradually downward trend,while Na+/K+ exhibits the opposite trend.Tectonic additional hydrostatic pressure (Ps) can drive ore-forming fluids to migrate from areas with higher Ps to lower Ps,leading to ore precipitation.There is a tectono-physicochemistry interface between the high and low values of tectono-physicochemical parameters,with gold deposits primarily located in stress relaxation zones at this interface.

Key words: tectonic alteration lithofacies, tectono-physicochemical parameter, abrupt change zone, Dayin’gezhuanggold orefield

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