利用重磁资料研究南岭于都－赣县矿集区花岗岩与断裂分布特征  

A Study of the Granite and Faults Distribution Based on Gravity and Magnetic Data Obtained in Yudu-Ganxian Ore Concentration Area of Nanling

作　　者：刘金兰[1] 赵斌[2] 王万银[1] 李建国[2] 冯旭亮[1] 周新鹏[2] 王云鹏 

机构地区：[1]长安大学重磁方法技术研究所,长安大学地质工程与测绘学院,长安大学西部矿产资源与地质工程教育部重点实验室,西安710054 [2]山西省地球物理化学勘查院,山西运城044004

出　　处：《地质学报》2014年第4期658-668,共11页Acta Geologica Sinica

基　　金：国家“深部探测技术与实验研究专项”(SinoProbe)第3项目“深部矿产资源立体探测技术及实验研究”第3课题(SinoProbe-0303)资助的成果

摘　　要：于都-赣县矿集区是南岭东段一个具有良好找矿前景的钨、金银铜铅锌矿集区,花岗岩与成矿关系密切,而断裂构造往往是控岩、控矿构造。因此系统探查该区花岗岩和断裂构造分布是进一步找矿的关键问题之一。本文通过对该区重磁场特征与已出露花岗岩和断裂分布特征对应关系的研究,系统推断了该区花岗岩和断裂构造分布。研究表明:利用重力资料研究花岗岩分布具有较好的效果和较高的效率,而利用磁力资料只能推断出有磁性的花岗岩,推断出的隐伏花岗岩体规模大约是已出露花岗岩体规模的2倍;利用重磁资料推断了9条一级断裂和49条二级断裂;通过花岗岩体分布与断裂分布规律的研究表明该区断裂构造对花岗岩的发展起着主要的控制作用。上述成果为矿集区深部控矿岩体和控矿构造的进一步研究提供了地球物理依据。The ore area of Yudu-Ganxian is an concentration area with better prospecting potentiality for tungsten,gold,silver,copper,lead,zinc deposits in Eastern Nanling Range.Because the granite and mineralization relate closely,and the fault structure often follows rock- and ore- controlling structures. Therefore,the system exploration the granite and faults distribution in this area is one of the key problems for further prospecting.In this paper,we deduced the granite and faults distribution characteristics by a comparative study of the distribute characteristics correspondence among the gravity and magnetic field, exposed-granite and exposed-faults in this area.The result indicates the granite distribution obtained by gravity data reaches better result and is of high efficiency,while the magnetic data can only be used for magnetic granite inference,and the results of hidden granite body size is about 2 times than the exposed granite.We inferred nine first-order and forty nine second- order faults by the gravity and magnetic data. The study result of granite body and faults distribution shows that the faults play a major role in controlling the development of granite. These results above provide geophysics ground to further investigations for deep rock and ore controlling structures in concentrated region.

关 键 词：于都-赣县矿集区 重力异常 磁力异常 花岗岩 断裂 

分 类 号：P618.2[天文地球—矿床学] P588.121[天文地球—地质学]