西秦岭夏河-合作地区断裂构造分形结构特征及成矿预测
Fractal structural characteristics of fault structures and metallogenic prediction in Xiahe-Hezuo region of West Qinling Mountains
张元 1王红岩 1李育 1杨剑 1胡杨 2李永恒 2李彩霞 2任涛2
作者信息
- 1. 昆明理工大学,云南昆明 650093
- 2. 甘肃省地质矿产勘查开发局第三地质矿产勘查院,甘肃兰州 730050
- 折叠
摘要
西秦岭夏河-合作地区是中国重要的金矿及多金属矿床开发地带,区内断裂构造复杂,构造控矿作用显著.文章利用分形理论方法对夏河-合作地区不同方向断裂构造作定量分析,统计计算断裂构造容量维和信息维,结合矿床空间分布分形特征和矿床Fry分析,探讨研究区构造分形特征及断裂与矿床的空间展布关系.研究结果表明,研究区全部断裂容量维 1.2374,北东向断裂容量维 0.8229,北西向断裂容量维 1.2296,近东西向断裂容量维 1.0312,全部断裂容量和北西向断裂容量维处于断裂分形临界值(1.22～1.38)区域,显示研究区断裂构造连通性较好.研究区全部断裂信息维 1.1118,北东向断裂信息维 1.018,北西向断裂信息维 1.2296,近东西向断裂信息维1.0217,北西向断裂信息维处于断裂分形临界值区域,反映北西向对矿床的控制最强.断裂构造分形维数可以表征矿床的沉积部位,以容量维、信息维等值线图以及Fry图划分出 3 个有利成矿区.
Abstract
The Xiahe-Hezuo area in the West Qinling Mountains is an important mining area for gold and polymetallic deposits in China,with complex fault structures and significant structural ore control.In this paper,the fractal the-ory method is used to quantitatively analyze the fracture structure in different directions in the Xiahe-Hezuo area,statistically calculate the fracture structure capacity and information dimension,combining with the fractal charac-teristics of the spatial distribution of the deposit and the Fry analysis of the deposit,the fractal characteristics of the structure of the study area and the spatial distribution relationship between the fracture and the deposit are dis-cussed.The results show that the total fracture capacity dimension of the study area is 1.2374,the north-east frac-ture capacity dimension is 0.8229,the north-west fracture capacity dimension is 1.2296,and the near-east-west fracture capacity dimension is 1.0312,and the total fracture capacity and the north-west fracture capacity dimen-sion are in the fracture fractal critical value(1.22～1.38)region,indicating that the fracture tectonic connectivity of the study area is good.The information dimension of all faults in the study area is 1.1118,the information di-mension of the north-east fault is 1.018,the information dimension of the north-west fault is 1.2296,the informa-tion dimension of the near-east-west fault is 1.0217,and the information dimension of the north-west fault is in the fracture fractal critical value area,reflecting the strongest control of the deposit in the north-west direction.Fracture structure fractal dimension can be used to characterize the sedimentary site of the ore,and three favor-able mineralization areas are identified by capacity dimension,information dimension contour map and Fry dia-gram.
关键词
分形维数/Fry分析/断裂构造/金矿分布/西秦岭夏河-合作地区Key words
fractal dimension/Fry analysis/fault structure/gold distribution/Xiahe-Hezuo area in West Qin-ling mountains引用本文复制引用
基金项目
国家自然科学基金(42072094)
国家自然科学基金(42162012)
校企合作项目(2023FW62)
出版年
2024
国家科技期刊平台
NSTL
万方数据