奇异性理论在钦杭成矿带(南段)庞西垌银金矿产资源预测中的应用

Application of singularity theory in prediction of silver and gold mineral deposits in Qinzhou——Hangzhou tectonic joint belt Pangxidong Area, Guangdong, China

以广东与广西交界处的钦州湾—杭州湾成矿带(南段)庞西垌银金矿预测为研究对象,探讨奇异性理论在矿产资源预测中的应用。针对地球化学异常阀值选择较难的实际情况,应用奇异性分析法进行地球化学奇异值制图。为了解庞西垌地区浅部与深部矿化类型的变化规律,进一步采用S-A广义自相似法分解复合异常,并结合空间主成分分析法圈定微量元素Ag,Au,Cu,Pb和Zn等组合异常。研究结果表明:奇异性分析法不仅强调数据在统计上的特征,而且重视数据在空间域的特征,通过奇异值估计来确定异常,从地球化学数据集的多种类群的角度来识别和圈定异常;该方法避免了采用同一浓度阀值用于不同地球化学数据区域且该法直接处理原始数据,相对传统方法而言保留了原始数据特征;采用S-A法提取出的异常与研究区已知矿点吻合程度较高,且主要集中在研究区的塘蓬幅内,位于研究区石角幅区域已知矿床(点)较少,异常较弱;而通过S-A法分解出来的异常显示该区域可能存在隐伏矿床,可通过野外工作进一步查证。

Taking Pangxidong silver gold mine prediction as an example,the application of singularity theory in mineral deposits prediction was studied.Based on the fact that the geochemical is abnormal and the threshold selection is difficult,singularity analysis method was used to map geochemical singular value.In order to understand the variation of shallow and deep mineralization types in Pangxidong area,S-A generalized self-similar method was used to decompose complex anomalies,and combines with the spatial principal component analysis method to delineate complex anomalies of trace elements such as Ag,Au,Cu,Pb and Zn.Tte results show that the singularity analysis method not only emphasizes the data on the statistical characteristics,but also pays attention to the feature in the spatial domain,identifies and delineates anomalies from a variety perspective of geochemical data sets.The anomaly extracted by S-A method agrees with the known ore deposits which are mainly in Tangpeng area.There are a few known ore deposits in Shijiao area where the anomalies are weak.The anomaly of the area by S-A method shows that there may be concealed deposits,which can be investigated by further work.