奇异值分解技术及地球化学块体方法在南黄岗—甘珠尔庙成矿带找矿中的应用  

The application of singular-value decomposition(SVD) and geochemical blocks methods to the prospecting in southern Huanggang-Ganzhu'ermiao metallogenic belt

作　　者：周顶[1,2] 陈永清[1] 赵彬彬[3] 

机构地区：[1]中国地质大学(北京)地球科学与资源学院,北京100083 [2]武警黄金部队第六支队,河南三门峡472000 [3]中国科学院地质与地球物理研究所,北京100029

出　　处：《中国地质》2014年第2期621-637,共17页Geology in China

基　　金：国家自然科学基金"超大型矿床成矿复杂性特征与成矿动力学机制探索"(41272365);"数据挖掘与找矿靶区资源潜力模拟非线性技术研究"(40972232)联合资助

摘　　要：以黄岗—甘珠尔庙成矿带南部1∶20万化探扫面数据为基础,借助奇异值分解技术及地球化学块体方法,提取了该区地球化学综合异常及评价该区锡、锌矿的成矿潜力。通过研究得出如下结论:(1)不同方向构造的交汇部位、构造截切地球化学异常的部位或不同方向异常的叠加部位,是寻找钼、锡、钨、铜、铅、锌等矿床的有利地段;(2)区内多数矿床的赋存状态与二叠纪地层有密切的空间关系,特别是二叠纪地层与岩体的接触带或二叠纪地层与其他时代地层的接触带并发育断裂构造的部位;(3)研究区内共圈定了Sn地球化学块体1个,区域异常1个,局部异常8个;Zn地球化学亚块体1个,区域异常1个,局部异常7个。并以1 000 m作为块体厚度,计算了该区潜在锡资源量为211.92万t,潜在锌资源量为146.42万t;(4)通过对该区地球化学块体及异常结构的分析,并根据该区锡、锌矿的成矿条件来确定远景区的等级,本文共圈定了Sn成矿Ⅰ类远景区3个,Ⅱ类远景区4个,Ⅲ类远景区2个;Zn成矿Ⅰ类远景区3个,Ⅱ类远景区2个,Ⅲ类远景区2个。Based on the 1c200000 geochemical exploration data of southern Huanggang-Ganzhu＇ ermiao metallogenic belt,the authors employed the singular-value decomposition technique and geochemical blocks methods to extract geochemical synthetic anomalies and assess the Sn and Zn mineralizing potential.The conclusions drawn by the authors are as follows：（1） The intersections of structures in different directions and the area where structure truncates the geochemical anomalies or the superimposed area of anomalies in different directions are favorable positions for Mo,Sn,W,Cu,Pb,Zn prospecting.（2） Most of the deposits in the study area have a close spatial relationship with the Permian strata,especially the contact zone between the Permian strata and the rock mass or the contact zone between the Permian strata and strata of other epochs with well-developed faults.（3） ASn geochemical block,a regional anomaly and eight local anomalies as well as a zinc geochemical block,a regional anomaly and seven local anomalies were delineated.With 1 000 m as the thickness of the block,the total potential mineral resource of Sn is 211.92 million tons,and the potential mineral resource of Zn is 146.42 million tons in the study area.（4） By analyzing the structures of the geochemical blocks and anomalies,three first-order Sn prospective areas,four second-order Sn prospective areas and two third-order Sn prospective areas,along with three first-order Zn prospective areas,two second-order Zn prospectiveareas and two third-order Zn prospective areas,were delineated according to the metallogenic conditions.

关 键 词：奇异值分解 地球化学块体 黄岗—甘珠尔庙成矿带 远景区 

分 类 号：P632[天文地球—地质矿产勘探]