摘要
数学地质可用不同的分析方法和图件综合显示多元地球化学数据中的核心信息,对矿床地质特征进行合理的地质解释。凉城草几坝一带1∶2.5万土壤化探测量显示出本地区矿化异常是一个以Au为主,伴随有As、Cu、Ag等元素的多元素组合异常。本文应用数学地质分析方法对凉城草几坝一带的南伙房1∶2.5万土壤化探数据进行了分析,得出该区异常主要是由一系列北东向构造破碎带所形成的矿化异常。南伙房和坝底地区的土壤化探数据聚类分析表明,8种微量元素可以分为4类,Cu、Ag、Au、As为一类,Pb、Zn为一类,Bi和Sb各为一类。第一类是反映石英脉或蚀变岩型矿化的指示元素组合,第二类反映了中低温的矿化元素组合。南伙房土壤化探元素主因子F1可能代表了石英脉-蚀变岩金矿化。对南伙房440个样品分别计算F1因子得分,得分大于1的有33个,F1因子得分异常等值线图与南伙房工作区Au、As、Cu异常等值线图异常分布情况大致相吻合,因此,Au、As的异常区域及F1因子得分>1的样品所在的区域重叠处应该是以Au为主的找矿重点区域。
Soil geochemical measurements at 1：25000 scale around the Caojiba area of Liangcheng county, Inner Mongolia reveal an anomaly combination of multiple elements dominated by Au accompanied by As, Cu and Ag. This work used the method of mathematical geology to analyze the data of soil geochemical survey at 1：25000 scale in Nanhuofang of this region, and made a geological interpretation to the deposit. It suggests that the anomalies from the geochemical survey are associated with mineralization along a series of NE trending fracture zones. Cluster analysis on the soil geochemical data of the Nanhoufang and Badi areas shows that eight kinds of trace elements can be divided into four categories, i.e. Cu, Ag, Au and As as the first, Pb the sec- ond, Zn the third, and Bi and Sb the forth. The first category reflects a combination of indicator elements of quartz-vein or altered rock-type mineralization, and the second category the combination of mineralization elements under low-medium temperature. The primary factor of soil geochemical element F1 may represent a quartz-vein-altered rock-type gold mineralization. There are 33 samples of which the factor FI scores more than 1 among all the 440 samples from the Nanhuofang area. Contours of the factor F1 score anomalies are roughly consistent with that of Au, As and Cu anomalies in the Nanhuo- fang area. Thus, the overlap portion between the Au and As anomaly area and the area where factor F1 scores higher than 1 should be the focused target for ore searching dominated by Au.
出处
《地质与勘探》
CAS
CSCD
北大核心
2011年第3期473-482,共10页
Geology and Exploration
基金
内蒙古自治区地质勘查重大科技项目(内地研200415003)资助
关键词
聚类分析
因子分析
土壤地球化学测量
金异常
soil geochemistry, Au-multiple clement anomalies, mathematical geology, mineralization, Inner Mongolia
作者简介
[第一作者]魏浩（1981年-），男，博士研究生，矿业工程专业，E-mail：ronghaiwei@163．com
