基于S_(L)参数和Hack剖面的个旧矿区西部构造地貌特征分析

Analysis of structural and geomorphological characteristics in the west of Gejiu mine based on S_(L) parameters and Hack sections

通过解析个旧矿区节理构造,提取了区内5条主要河流的Hack剖面和河长坡降指标S_(L),分析了地层岩性、断裂构造和构造活动之间的关系,结果表明:研究区内优势节理走向以NW为主,其作为断裂的伴生产物,反映了喜山前中期构造应力的作用;河流在流经NW向断裂与SN向断裂时,S_(L)始终保持高位且局部达到1400 m的峰值,反映了该参数对断裂构造的积极响应;同时,Hack剖面中K值由229变为332,表明区域内地层岩性对河流侵蚀能力的影响由弱变强,导致S_(L)在岩性变化处也产生了显著变化;Hack剖面呈上凸形态,区域整体处于构造抬升阶段,且抬升速率较快,反映构造活动较强烈。通过对构造地貌特征的分析,对理解该矿区构造形成过程和指导矿产勘查工作具有重要意义。

By analyzing the joint structure of Gejiu mine,some hack sections and stream length(S_(L))gradient of five major rivers within the area were extracted to study the relationship between stratum lithology and fault structure and tectonic movement.The results show that the dominant joint strike in the studying area was NW,as the associated product of the fault,it reflects the role of tectonic stress played in the middle pre Himalayan period.When the river flowed across NW fractures and SN fractures,the S_(L) always remained high and partly reached the peak of 1,400,indicating the positive response of the parameter to the fault structure.Meanwhile the K value in Hack section varied from 229 to 332,showing that the influence of stratum lithology on river erosion capacity was increasing,resulting in significant changes of S_(L) in the place with the change of lithology.Hack section presented upwards convex and the whole area was under tectonic uplifting at a high uplift rate,reflecting its strong tectonic movement.The analysis of structural and geomorphological characteristics is of great significance to understand the structural formation of the mine and instruct further mineral resource exploration.