【作者】 陈艳；

【导师】 杨斌；

【作者基本信息】 中南大学 ， 构造地质学， 2010， 硕士

【摘要】 本论文在成矿分析基础上,采用遥感蚀变提取、构造地球化学测量、EH-4电磁测量等技术,开展了龙泉站金矿成矿作用与找矿预测研究。主要成果包括：1.龙泉站金矿主矿体产于沂水-汤头断裂蚀变糜棱岩和碎裂岩带内。矿石中SiO2含量相对较高,与黄铁绢英岩蚀变过程中Si的聚集有关,CaO、MgO、MnO、TiO2、P2O5等组分在所有测试对象中为最低,显示这些组分在蚀变矿化过程中被显著带出。据La/Yb-REE含量图解分析,本区岩矿石物质成分主要来自沉积岩,混合岩及绿片岩的初始物质中可能混有基性火山岩成分。成矿地质条件可以归纳为成矿构造、成矿物源和成矿热源等3个方面。成矿时代在白垩统马郎沟组地层形成之后。成矿作用与大气水参与的热液对流成矿系统有关。2.利用美国陆地卫星LANDSAT-7ETM数据,对龙泉站及其外围地区约1200km2蚀变异常信息进行提取。遥感泥化蚀变与铁化蚀变异常的分布与花岗斑岩、花岗闪长岩、二长花岗岩及寒武系地层分布地区空间关系密切。根据遥感蚀变的分布特征,结合地质条件分析,圈定找矿远景区4处。3.完成龙泉站测区地表构造地球化学扫面16km2,发现3处连续Au元素异常。相关分析、聚类分析及因子分析显示,Au的聚集与Pb、Ag、Cu、Mo、Bi、As、Ba等元素关系密切。结合地质分析,本区金矿找矿的最佳指示元素组合可厘定为Au-Ag-Pb-Cu-As-Ba。4.根据构造地球化学异常的分布及地表矿化情况,选择16线和111线开展了EH-4电磁测量。根据龙泉站测区构造地球化学异常分布及EH-4电磁测量成果,共圈定找矿靶位2处。更多还原

【Abstract】 Based on the metallogenic analysis, the mineralization and ore prediction in Longquanzhan gold deposit were studied by means of extraction of remote sensing alteration information, tectonic geochemistry, EH-4 geophysical sounding etc. The main conclusions were made as follows:1. The main orebodies of Longquanzhan gold deposit occurred in altered mylonite and cataclasite of Yishui-Tangtou fault. The higher content of SiO2 in ores related to the aggregation of Si in the process of beresitization. The lower content of CaO, MgO, MnO, TiO2, P2O5 in ores showed these compositions were brought out in the process of alteration and mineralization. According to the La/Yb-REE content scheme, the material compositions in ores and rocks came mainly from sedimentary rocks, and the initial materials of chorismite and greenschist possibly contained the composition of basic lava. The geological condition of mineralization included ore-controlling structure, material source and heat source of mineralization. Metallogenic epoch of Longquanzhan gold deposit was the time after the formation of Malanggou group stratum in Cretaceous. The mineralization of Longquanzhan gold deposit related to the hydrothermal covection metallogenic system in which meteoric water participated2.The remote sensing alteration information was extracted according to USA LANDSAT-7ETM data in 1200km2 of Longquanzhan and its periphery. The distribution of iron and argillic alteration related closely to the areal area of granite porphyry, granodiorit, monzogranite and Cambrian system. Four ore-finding perspective areas were determined according to the distribution of remote sensing alteration information and geological condition.3. Three successive abnormities of Au element were found through surficial tectonic geochemistry survey of 16km2 in Longquanzhan. The aggregation of Au related closely to Pb, Ag, Cu, Mo, Bi, As, Ba according to correlation analysis, cluster analysis and factor analysis. Combined with geological analysis, the optimal indicator elements association of ore prediction were determined as Au-Ag-Pb-Cu-As-Ba.4. Based on the distribution of tectonic geochemistry abnormity and surficial ore occurrence, EH-4 geophysical sounding were carried out in 16 and 111 exploratory lines. Two prospecting targets were delineated according to the abnormity of tectonic geochemistry and EH-4 geophysical sounding.更多还原