东昆仑东段浪木日地区地球化学异常信息提取方法研究及异常查证

Study on extraction method of geochemical anomaly information and abnormal area verification in the Langmuri area,eastern part of East Kunlun

青海沟里地区位于东昆仑造山带东段,根据水系沉积物地球化学测量已发现了多个矿床(点),具有较好的找矿潜力。本文选取沟里地区巴加别里赤尔幅(浪木日地区)1∶5万水系沉积物地球化学测量数据为研究对象,利用统计学方法和趋势面分析法两种方法进行异常信息提取。结果显示,趋势面分析法相较于传统统计法,圈定的异常面积更大、浓集中心更明确、分带特征更明显,且与已知矿床点的吻合度更高,整体上具有强化低背景异常的优势。同时利用趋势面分析法提取了3个元素组合,并对套合性和相关性突出,且与区内浪木日铜镍硫化物矿床相关的Cu-Zn-Cr-Co-Ni组合异常进行异常剖析。结合区内地质特征和浪木日矿区矿体分布情况,圈定了哲扎空龙洼东、龙里、瑙格木东和卡鲁南等找矿远景区,为区内下一步铜镍找矿工作提供了方向。

Gouli area,located in the eastern part of the East Kunlun Orogen,Qinghai Province,has good prospecting potential.According to stream sediment geochemical survey,several deposits(spots)have been found in Gouli area.In this paper,the 1∶50000 stream sediment geochemical survey data of Bagabelicher sheet(Langmuri area)in Gouli area is selected as the research object,and the statistical method and trend surface analysis method are used to extract the abnormal information.The results show that compared with the traditional statistical method,the trend surface analysis method delineates larger anomaly area,clearer concentration center,more obvious zonation characteristics,higher coincidence with known ore deposit points,and has the characteristics of strengthening low background or low slow anomaly.This paper uses the trend surface analysis method to extract three element combinations,and analyze the Cu-Zn-Cr-Co-Ni combination anomalies that have outstanding fit and correlation and are related to the Langmuri copper-nickel sulfide deposit in the area.Combining the geological characteristics of the area and the distribution of ore bodies in the Langmuri mining area,and the prospecting prospect areas such as East Zhezakongwa,Longli,East Naogemu and South Kalu are delineated,which provides the direction for further copper nickel prospecting in the area.