GIS矿床定量综合预测在川滇黔接壤区铅锌多金属矿化域的应用

GIS-based quantitative comprehensive prediction of Pb-Zn deposit in Metallogenic Province at border area of Sichuan,Yunnan and Guizhou provinces

运用GIS矿床定量综合预测方法,在川滇黔接壤区铅锌多金属矿化域选取断裂、赋矿层位、地层组合关系、线环构造、构造复杂程度等控矿因素作为预测信息,提取找矿信息量,圈定和优选找矿靶区。以3 000m×3 000m作为基本统计单元格,选取NE向断裂、次级断裂构造、多个有利赋矿层位、线环构造交汇部分等控矿因素,提取变量信息,分析变量信息特征及变量计算结果优选找矿信息,通过分析单元信息量单元频数曲线,以横坐标1.3为临界值划分铅锌多金属矿床预测靶区,共划分出Ⅰ级靶区5个,Ⅱ级靶区6个,Ⅲ级靶区4个。

GIS-based quantitative comprehensive prediction of mineral deposit is used to prediction of PbZn mineralization in the border area of Sichuan,Yunnan and Guizhou provinces.The ore-control factors,such as fracture,ore-bearing stratum,combination of strata,linear and ring structures and structural complexity are selected for prospecting information volume extraction by which targets are lineated and optimized.3000 × 3000 m is defined as the basic cell of statistics.NE fractures,secondary faults,several favorable ore-bearing formations,intersection of the linear and ring structures are preferred the ore-control factors by which variables information is extracted.Characteristics analysis of the variables information and the variables calculation results are used to optimize the prospecting information.The cell information volume and frequency curve are analyzed and the value of 1.3 at abscissa is chosen as the critical value for chose of the prediction targets.According the value four targets of grade I,six targets of grade 11,four targets of grade Ⅲ are delinated.