基于地球化学元素序结构技术的内蒙古大兴安岭中南段地质成矿分析

地球化学元素序结构分析是基于地球化学、岩石学、矿床学与复杂系统等多学科的综合而提出的技术思想。地球化学模式识别分类和元素基因谱曲线生成是其两大核心技术,文章应用这两项技术对已预处理的大兴安岭中南段地区1∶20万地球化学水系沉积物测量数据进行处理,得到该地区地球化学地质(成矿)单元分区与对应的地球化学元素基因谱曲线。地球化学地质(成矿)单元分区图与该区域地质简图有较好的对应关系。利用地球化学元素基因谱曲线对该区域成矿作用进行分析,发现该区域至少存在两个期次的地质成矿作用,且大部分矿床(点)均为两个期次成矿作用叠加、改造形成。不同地球化学元素基因谱曲线所表现的"基因"特征正好与研究区内不同期次花岗岩中黑云母、角闪石所表现出的元素特征相对应。二叠系海相火山沉积岩地层元素基因谱曲线强烈富铜的"基因"特征反映出该区具有形成大型铜矿的巨大潜力。研究表明,不同元素异常分布区无论其异常强或弱,元素基因谱曲线均能呈现出一些显著的"基因"特征,表明该技术方法有助于地球化学元素弱异常的识别与评价,为地球化学找矿提供强有力的技术支撑。

Geological metallogenic analysis of the central-south part of Greater Khingan Mountains in Inner Mongolia based on geochemical elements sequence structure

Geochemical elements sequence structure analysis is based on the idea of geochemistry, petrology, mineralogy, complex systems and other multi-disciplinary integration. Classification of Geochemical pattern recognition and generationelements gene profile curve are the two core technologies. In this paper, the geochemical geology (mineralization) unit partition and the corresponding geochemical element gene profile curve of the area were obtained by using these two techniques to deal with the pre-processed data of 1:200,0 geochemical stream sediment survey in the central and southern part ofGreaterKhinggan Mountains area. Geochemical geology (mineralization) unit zoning map and the regional geological map have a good correspondence. The results showed that there are two periods of geological mineralization at least in the region, and most of deposits are formed by superimposingof the two periods mineralization. The "gene" characteristics of the different geochemical elements gene profile curve corresponds to the elemental characteristics of biotite and amphibole in different period granites in the study area. The "gene" characteristics of the copper-rich elements in the Permian marine volcanic sedimentary rocks reflects the great potential to form large-scale copper deposits in this area. The results showed that the elements gene profile curve can present some significant "gene" characteristics, no matter the abnormal is strong or weak, indicating that the technique contributes to the identification and evaluation of the weak geochemical elements, provides a strong technical support for prospecting exploration.