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

• 构造物理化学控矿机理与找矿应用 • 上一篇    下一篇

胶东大尹格庄金矿田构造物理化学参量急变带成矿特征

王宗永1(), 吕古贤2(), 张宝林3, 李永武4, 马生明5, 韩鑫6, 张亮亮7, 袁月蕾8, 刘智方9, 何昌成10   

  1. 1.兰州财经大学公共管理学院,甘肃 兰州 730000
    2.中国地质科学院地质力学研究所,北京 100081
    3.中国科学院地质与地球物理研究所矿产资源研究重点实验室,北京 100029
    4.北京工业大学经济管理学院,北京 100124
    5.中国地质科学院地球物理地球化学勘查研究所,河北 廊坊 065000
    6.北部湾大学资源与环境学院,广西 钦州 535011
    7.山东省第六地质矿产勘查院,山东 威海 264209
    8.中国科学院地理科学与资源研究所资源与环境信息系统国家重点实验室,北京100101
    9.广东省佛山地质局,广东 佛山 440600
    10.重庆市地质矿产勘查开发局南江水文地质工程地质队,重庆 401120
  • 出版日期:2024-08-10 发布日期:2024-10-16
  • 通信作者: 吕古贤,男,研究员,1949年出生,主要从事区域地质、地质力学、矿田地质研究。Email: lvguxian@126.com
  • 作者简介:王宗永,男,博士,副教授,1984年出生,主要从事地质学、碳中和、可持续发展等方面的教学与研究工作。Email: 417571385@qq.com
  • 基金资助:
    国家科技支撑计划项目(2014BAB05B00);甘肃省高等学校创新基金项目(2022B—130);兰州财经大学科研项目(Lzufe2021C—014)

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
  • Published:2024-08-10 Online:2024-10-16

摘要:

在金属内生矿矿田地质研究中,构造变形岩相既能反映矿田形成的构造应力场特征,又能揭示其地球化学特征和物理化学条件。胶东金矿集中区在全球金矿中独具特色,其金矿储量规模位居世界第三,大尹格庄金矿田是区内特大型金矿田之一。在矿田构造蚀变岩相研究基础上,厘清矿田成矿构造物理化学参量之间的关系,探讨构造作用通过影响矿田成矿物理化学条件驱动金成矿作用问题显得尤为必要。本文选取代表成矿流体成分、温压、性质和成矿构造等条件的构造物理化学参量,采用因子分析法,探讨矿田构造成岩成矿问题。结果显示:流体包裹体成分CO2/H2O、酸碱度(pH)、氧逸度(lg$f_{0_{2}}$)、构造附加静水压力(Ps)、流体包裹体均一温度以及流体包裹体最小压力(Pmin)等参量代表的构造物理化学条件对成矿的影响较大,CO2/H2O、lg$f_{0_{2}}$、Ps、均一温度、Pmin所代表的成矿流体成分、性质、温压条件及构造作用的影响是正相关的,而pH影响是负相关的;矿田黄铁绢英岩带、黄铁绢英岩化花岗质碎裂岩带和强钾长石化花岗岩带中,构造附加静水压力(Ps)、流体包裹体成分CO2/H2O、氧逸度(lg$f_{0_{2}}$)、流体包裹体最小压力(Pmin)和均一温度均依次呈现先升高再降低的趋势。流体包裹体成分Na+/K+、F-/Cl-参量代表的成矿物理化学条件对于成矿的影响是负相关的,在黄铁绢英岩带、黄铁绢英岩化花岗质碎裂岩带和强钾长石化花岗岩带中,F-/Cl-依次呈现逐渐降低的趋势,Na+/K+则依次呈现逐渐增大的趋势。构造附加静水压力(Ps)能够促使成矿流体从Ps较高的部位向较低的部位运移并沉淀成矿。 构造物理化学参量的高低值之间存在构造物理化学界面,金矿体主要位于界面的构造应力松弛部位。

关键词: 构造蚀变岩相, 构造物理化学参量, 急变带, 大尹格庄金矿田

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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