桂西北微细浸染型金矿综合信息成矿预测——以乐业隆起带为例  

Comprehensive Information Metallogenic Prospecting on Micro-Disseminated Gold Deposits in Northwest Guangxi——A Case from Leye Uplift Zone

作　　者：付伟[1,2] 郭威[1,2] 郭建东[3] 庞保成[1,2] 柴明春[1,2] 黄小荣[1,2] 

机构地区：[1]桂林理工大学地球科学学院,广西桂林541004 [2]桂林理工大学广西隐伏金属矿产勘查重点实验室,广西桂林541004 [3]广西壮族自治区国土资源交易中心,南宁530028

出　　处：《桂林理工大学学报》2013年第1期7-13,共7页Journal of Guilin University of Technology

基　　金：国家自然科学青年基金项目(41102051);广西自然科学基金项目(2012GXNSFAA053187);广西自然科学青年基金项目(桂科青0991083);广西重点实验室建设项目(11-031-20;12-071-20)

摘　　要：桂西北地处"滇黔桂金三角"东南端,区内微细浸染型金矿集中分布于右江裂陷盆地内的局域性隆起带周缘,形成了若干以穹窿为单元的独立或叠合型矿集区。基于这一区域成矿规律的基本认识,选取乐业隆起带为典型研究区,在成矿地质背景和典型矿床分析的基础上,通过已知矿床与区域地质、化探、遥感等数据资料的空间关联分析,提取了百逢组含矿地层、地层组合熵、断裂等密度、控矿断裂缓冲区、Au化探异常区、遥感线性构造和环形构造缓冲区等8个成矿信息预测变量,构建了基于MRAS系统的综合信息证据权重找矿预测模型。通过网格单元(1.55 km×1.55 km)计算后验概率,采用最大值与最小值4级优选分级评价方法在研究区圈定出三级成矿远景区,预测结果与实际吻合性较好。结果显示,在乐业-甘田-浪平、龙车-平山和花坪-马庄一带具有形成微细浸染状金矿床的良好潜力。The micro-disseminated gold deposits are widely formed in Northwest Guangxi,part of the Yunnan-Guizhou-Guangxi Golden Triangle and famous for current scientific research and mineral exploration.In the Youjiang basin,the gold deposits are dominantly distributed around the edge zone of many isolated or overlapping uplifts.Based on the regional metallogenic regularities,a typical study on Leye uplift area is carried out for the comprehensive information metallogenic prospecting.By analyzing the ore-forming geological background and typical ore deposits,the spatial relationships are studied between the ore deposits with regional geology,geochemical exploration and remote sensing data,and eight variables extracted as effective ore-forming information including the Baifeng formation,stratigraphic combination entropy,fault density,ore-controlling fracture,edge zone of uplift,Au geochemical anomalies,remote sensing linear structure and ring structures to construct a comprehensive information prospecting model.By calculating the posteriori probability in the grid unit（1.55 km×1.55 km）,and evaluating the classification with the maximum and minimum values 4 level grading method,three level metallogenic prospective areas are distinguished.The results show that three districts have good prospecting potential along the Leye country-Gantian town-Langping,Longche-Pingshan and Huaping-Mazhuang.

关 键 词：微细浸染型金矿 成矿预测 MRAS 乐业隆起 桂西北 

分 类 号：P628[天文地球—地质矿产勘探]