地球化学勘查综合定量评价在赣东南大墩矿区的应用

赣东南大墩地区铜金多金属矿化主要产于晚三叠世黑云正长花岗岩与南华系接触带附近,受南华系浅变质岩地层岩性及断裂破碎带控制明显。本文以该区1：5万矿产远景调查项目大墩靶区成功找矿为例,基于M APG IS软件系统,对勘查区进行了化探数据处理、化探异常剖析、元素聚类分析、元素定量统计分析、剥蚀程度定量评价等综合定量评价。工作成果表明,勘查区显示铜金为主要矿种、银铅锌为伴生矿种的中低温热液型矿床特征,矿化类型主要为石英脉型,矿床可达小型-中型规模。在风化剥蚀面显露出金铜等近矿地球化学原生晕指示元素。根据地球化学勘查综合定量指标分析,认定大墩地区为面积约15 km2具有中型铜金多金属矿产地勘查前景的找矿靶区。应用以上成果,该区已取得明显找矿效果。

Application of comprehensive quantitative assessment of geochemical exploration,as an example of Dadun mineralized region,southeast Jiangxi Province

The copper-gold-polymetallic mineralization in the Dadun region, southeast Jiangxi Province, is mainly occurred in the Nanhua System epimetamorphic elastic rocks distributed nearby the contact zone between Late Triassic biotite orthoelase granite and Nanhua System strata,and is obviously controlled by lithologieal characters of strata and faulted-fracture zones. Taking the successful ore-prospecting of the 1：50000 mineral resources potentiality investigation in the Dadun exploration target area as an example, basing on the MAPGIS software system, this paper carried out geochemical data processing, analysis of geochemical anomalies and elements associations, quantitative calculation and analysis of ore-forming elements, and quantitative analysis of denudation degrees of the exploration target area. The work results have caused to come to the following conclusions： The exploration target shows characteristics of a middle to low temperature hydrothermal deposit with main mineralization of copper and gold and associated mineralization of silver, lead and zinc; the quartz vain type is the main mineralization type~ the exploration target has a potentiality of a small to middle-sized deposit~ the primary geochemical dispersion halos indicate that the halo elements are weathered-denuded whereas the near-ore body halo indicator elements are shown at the denudation surface, being favorable for trenching and pitting the near-surface ore body. According to the comprehensive analysis of quantitative indexes of the geochemical exploration,it is believed that the Dadun region is a 15 km2-sized ore-hunting target with a potentiality of a middle-scale copper-gold-polymetallic deposit. The application of abovementioned results has caused the region to obtain obvious ore-prospecting effects.