ArcGIS在东昆仑西段铁矿资源综合信息矿产预测中的应用——以沉积变质型铁矿为例  

Application of ArcGIS in Prediction of Iron Ore Resources in the Western Segment of East Kunlun:A Case Study of Sedimentary Metamorphic-type Iron Deposits

作　　者：刘艳宾[1] 弓小平[1] 陈斌[1,2] 王哲[1] 吴艳爽[1] 

机构地区：[1]新疆大学,乌鲁木齐830049 [2]北京大学地球与空间科学学院,北京100871

出　　处：《地质学报》2012年第6期1005-1019,共15页Acta Geologica Sinica

基　　金：中国地质调查局地质调查项目(编号1212010880202);新疆大学天山学者特聘教授陈斌配套科研启动基金共同资助的成果

摘　　要：结合地质、物探、化探、遥感等多元找矿信息,通过对多元信息的发现、提取、转换和关联,并利用信息综合技术建立区域综合信息矿产预测模型,进行矿产资源定量评价,是目前矿产资源勘查领域信息找矿的重要途径之一。本文从研究区的地质背景和已知的7个沉积变质型铁矿(点)出发,结合野外验证分析,建立成矿模型与有利区提取模型,基于ArcGIS平台,建立研究区的空间数据库,通过对多元资料的综合分析,并对各控矿因素进行综合评定,提取3个主要方面的预测因素:沉积地层;有利地球化学异常(Fe元素);有利地球物理异常(原平面)。根据这3个证据图层与已知铁矿(化)点的叠加合成空间相关性分析,运用证据权模型和加权logistic回归模型进行成矿有利度评价,结合遥感蚀变信息缩小找矿范围,圈定3个沉积变质型铁矿预测区。研究结果显示东昆仑西段地区具有较好的找矿前景。Combined with various prospecting approaches such as geology, geophysics, geochemistry and remote sensing etc. , a comprehensive model of regional information mineral prediction was established in this study using the multi information discovery, extraction, transformation and association, and comprehensive techniques. The model is used to conduct the quantitative assessment for mineral resources, being one of the important prospecting ways in the field of mineral resources exploration. Starting from the geological background and 7 known sedimentary metamorphic-type iron deposits （occurrences） in the study area, and combined with field check analysis, this paper established the metallogenic model and the favorable extraction model. The spatial database of the study area was built based on the ArcGIS platform. Multi-information was employed to assess ore-controlling factors and three prediction factors were determined, sedimentary strata, favorable geochemical anomalies （Fe elements）, and favorable geophysical anomaly （the original plane）. Based on the spatial relationship of three layers of evidence and superimposing relation of known iron mineralization or prospects, the evidence weight model and weighted logistic regression model were used to evaluate metallogenic possibility. Remote sense alteration information was used to narrow the prospecting scope, and three prospect areas for sedimentary metamorphic-type iron deposits were delineated. Research results show that the western segment of the East Kunlun has a good prospecting future.

关 键 词：沉积变质型铁矿 ARCGIS 证据权模型 加权logistic回归模型 东昆仑西段 

分 类 号：P618.31[天文地球—矿床学] P208[天文地球—地质学]