招平断裂带小埠——东孟村段地球物理特征及成矿分析

Geophysical Characteristics and Prospecting Analysis of XiaobuDongmengcun Section of Zhaoping Fault Belt

摘要:

招平断裂带是胶东地区重要的成矿构造之一，其南段总体研究程度较中北段低。本研究以招平断裂带南段小埠东孟村段为研究对象，基于沿断裂带走向施测5条广域电磁剖面，结合区域构造背景，分析了招平断裂带南段垂向延伸展布特征及变化规律。结果表明，招平断裂带小埠东孟村段的产状由北向南表现出中部缓两侧陡的特征，结合胶东地区深部金矿阶梯式找矿方法理论，认为该区构造发育的陡缓转折处为成矿有利部位，推测小埠东孟村段成矿深度南北差异较大，由北部的2 400 m～3 000 m标高向南部的800 m～1 600 m标高呈现规律性变化，为招平断裂带深部找矿提供了地球物理依据。

Abstract:

Zhaoping fault belt is one of the important oreforming structures in Jiaodong area. The study level in its south section is less than that in central and north sections. Taking XiaobuDongmengcun section in the south of Zhaoping fault as the research object, based on 5 wide area electromagnetic profiles measured along the direction of the fault zone, combining with regional tectonic background, the vertical extension distribution characteristics and variation laws of the southern section of Zhaoping fault zone have been analyzed. The actual measurement results show that the occurrence of XiaobuDongmengcun section in Zhaoping fault zone is gentle in central and steep in two sides from north to south. Combining with the theory of stepped prospecting method for deep gold deposits in Jiaodong area, it is preliminarily believed that the steep and gentle turning point of the structural development in this area is a favorable location for mineralization. The difference in mineralization depth between the north and south of XiaobuDongmengcun is significant. It shows a regular change in elevation from 2400 m to 3000 m in the north to 800 m to 1600 m in the south. It will provide a geophysical basis for deep prospecting in Zhaoping fault belt.