青海都兰县香日德地区地球物理与地球化学特征及找矿研究

Study on geophysics and geochemistry features and prospecting in Xiangride area,Dulan county,Qinghai province

为查明香日德地区地球物理、地球化学特征,建立矿床找矿标志,查明找矿方向,在分析香日德地区地质资料的基础上,通过地磁测量、磁物性测定、激电测量、1∶25000水系沉积物地球化学测量、土壤测量、槽探工程等技术方法和手段,分析了扎麻日东和白石岩南的航磁异常特征、重力异常特征、地磁异常特征、磁性特征、激电异常特征、化探异常特征、土壤特征、蚀变带特征及矿体特征。研究表明,扎麻日东具有较好找矿前景的矿种为构造-热液性铅锌银矿床,其有利成矿部位为三叠系鄂拉山组内断裂交汇部位;白石岩南具有较好前景的矿种为矽卡岩型铜铅锌矿,其有利成矿部位为印支期晚三叠世侵入岩与上石炭统缔敖苏组大理岩的侵入接触交代形成的矽卡岩带。该研究对香日德区域综合异常利用地物化综合手段快速找矿具有指导意义,为今后的勘探开发提供了借鉴。

In order to find out the characteristics of geophysics and geochemistry in Xiangride area,establish ore prospecting marks and to find out the prospecting direction,on the basis of analyzing the geological data of Xiangride area,using the geomagnetic survey,magnetic property survey,induced polarization survey,1∶25000 stream sediment geochemistry survey,soil survey,and trench exploration engineering,etc.The characteristics of aeromagnetic,gravity,geomagnetic,and magnetic,induced polarization,and geochemical anomalies,as well as soil,alteration zone and ore body are analyzed.The study shows that the structural-hydrothermal Pb-Zn-Ag deposit is the most promising ore deposit in Zhamaridong area,and the favorable ore-forming place is the intersection of faults in the Triassic Elashan formation.The deposit with good prospect in the Baishiyannan is the sicarn-type Cu-Pb-Zn deposit,and the favorable ore-forming place is the skarn zone formed by the intrusive contact metasomatism between the late triassic Indosinian intrusive rocks and the upper carboniferous Diao-su formation marble.This study is of guiding significance in the fast prospecting of integrated anomalies in the Xiangride area by means of comprehensive geophysical and geochemical methods,and provides an important basis for future exploration and development.