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高校地质学报 ›› 2025, Vol. 31 ›› Issue (03): 346-362.DOI: 10.16108/j.issn1006-7493.2024045

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甘肃早子沟金矿区构造应力场数值模拟研究

杨 剑1,张卫雄2,陈爱兵1*,翟向华3,张 元1,姜 鑫3,胡 杨3,李永恒3   

  1. 1. 昆明理工大学,昆明 650500 ;
    2. 甘肃省煤田地质局,兰州 730099;
    3. 甘肃省地矿局第三地质矿产勘查院,兰州 730050
  • 出版日期:2025-06-17 发布日期:2025-06-17

Numerical Simulation of Tectonic Stress Field in Zaozigou Gold Mining Area, Gansu Province, China

YANG Jian1,ZHANG weixiong2,CHEN Aibing1*,ZHAI Xianghua3,ZHANG yuan1,JIANG Xin3,HU Yang3,LI Yongheng3#br#   

  1. 1. Kunming University of Science and Technology, Kunming 650500, China;
    2. Geological Bureau of Coal Field of Gansu, Lanzhou 730099, China;
    3. The Third Geological and Mineral Exploration Institute of Gansu Provincial Bureau of Geology and Mineral Resources, Lanzhou 730050, China
  • Online:2025-06-17 Published:2025-06-17

摘要: 甘肃早子沟金矿床位于西秦岭夏河—合作地区,是西秦岭成矿带中的大型金多金属矿床,其成矿作用与断裂构造关系密切。该文通过矿区构造地质特征研究,以断裂构造、节理、擦痕为研究对象,确定了早子沟金矿床控矿构造演化序列及主应力方向,认为早子沟金矿控矿构造演化经历了三期六个阶段。为了了解矿区构造应力场分布趋势及展布范围,以构造应力场分析为基础,基于岩石力学实验,测定岩石的力学参数,建立合理的地质力学模型,采用有限元法(FEM)对早子沟金矿区地质构造进行二维构造应力场数值模拟,并对成矿有利的部位进行预测。研究结果表明:矿区构造应力场分布受断裂控制,各个时期的最大、最小主应力值分布基本处于断裂周缘,应力强度是决定构造活动强度的主要因素。应力高值区域构造活动强烈,岩石破碎,为成矿提供了通道和赋存部位。据此推测近南北向断裂两端及东北向断裂与西北向断裂的交汇部位是成矿的有利部位。

关键词: 构造演化, 构造应力场, 有限元法, 数值模拟, 早子沟金矿床

Abstract: The Zaozigou gold deposit in Gansu Province is situated within the Xiahe-Hezuo area of the West Qinling Mountains. It represents a significant polymetallic gold deposit within the West Qinling metallogenic belt, exhibiting a high degree of mineralization that is closely associated with the regional tectonic activity. By examining the tectonic and geological characteristics of the mining area, with a particular focus on faults, joints, and scuff marks, the evolutionary sequence of the orecontrolling structures and the principal stress directions of the Zaozigou gold deposit have been determined. It is hypothesized that the tectonic evolution of the gold deposits in Zaozigou underwent three phases and six stages. In order to comprehend the distribution pattern and extent of the tectonic stress field within the mining region, a structural stress field analysis and a series of rock mechanics experiments were conducted, with the objectives of determining the mechanical parameters of the rocks and establishing a geologically logical mechanical model. A two-dimensional structural stress field numerical simulation of the Zaozigou gold mining area was conducted using the Finite Element Method (FEM), with the objective of predicting favorable sites for mineralization. The results demonstrate that the distribution of the tectonic stress field in the mining area is governed by the rupture. Furthermore, the maximum and minimum stress values in each period are predominantly concentrated at the periphery of the rupture. The intensity of stress is the primary factor in governing tectonic activity, with high stress areas exhibiting heightened structural activity and rock fragmentation, thereby creating pathways and sites conducive to mineralization. It is hypothesized that the two ends of the near-north-south faults and the intersection of the north-east and north-west faults represent optimal locations for mineralization.

Key words: tectonic evolution, tectonic stress field, finite-element method, numerical simulation, Zaozigou gold deposit

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