中国西北地区成矿元素区域地球化学特征  

Regional Geochemical Characteristics of Metallogenic Elements in Northwest China

作　　者：张晶[1] 杨博[1] 李宝强[1] 李慧英[1] ZHANG Jing;YANG Bo;LI Baoqiang;LI Huiying(Xi'an CenterofGeologicalSurvey,ChinaGeologicalSurvey,Xian,Shaanxi 710054,China)

机构地区：[1]中国地质调查局西安地质调查中心,陕西西安710054

出　　处：《现代地质》2018年第5期1042-1052,共11页Geoscience

基　　金：中国地质调查局基础性公益性地质矿产调查二级项目"西北地区矿产资源潜力评价与综合"(1212010881632);中国地质调查局基础性公益性地质矿产调查二级项目"乌兹别克斯坦;塔吉克斯坦及邻区矿产资源潜力评价"(DD20160105)

摘　　要：以中国西北地区陕西、甘肃、宁夏、青海、新疆五省(区) 32. 2万条区域地球化学数据为数据源,通过统计分析、空间分析、专家分析等手段,编制了地球化学系列图件,建立西北地区地球化学异常谱系。研究中首先统计了各地球化学区中W、Sn、Mo、Cu、Pb、Zn、Au、Ag、Ni共9种元素的富集程度,并以此为依据对各地球化学区进行排序;分别计算了各地球化学区和亚区W、Sn、Mo、Cu、Pb、Zn、Au、Ag、Ni等9种元素的异常显著度和综合异常显著度,据此对地球化学区和亚区进行排序。分析结果表明,秦岭地球化学区(Ⅳ-2)和(Ⅳ-2-4)小秦岭地球化学亚区分别为异常显著度最高的地球化学区和亚区,其中在小秦岭地球化学亚区中Mo异常显著度最高,异常规模最大,Au异常显著度次之。Based on 322,000 regional geochemical data of Shaanxi,Gansu,Ningxia,Qinghai and Xinjiang in Northwest China,a series of geochemical maps have been compiled and geochemical anomaly genealogy in Northwest China has also been established by statistical analysis,spatial analysis and expert analysis.The enrichment degree of W,Sn,Mo,Cu,Pb,Zn,Au,Ag and Ni in each geochemical region have been calculated,by which the geochemical region have been sorted,then the anomalous significance of W,Sn,Mo,Cu,Pb,Zn,Au,Ag and Ni in each geochemical region and sub-region have been calculated.Based on the result of calculation,the geochemical region and sub-regions has been sorted.The results show that Qinling geochemical region and Xiaoqinling geochemical sub-region are the geochemical regions and sub-regions with the highest anomaly significance,respectively.In Xiaoqinling geochemical sub-region,the anomaly significance index of Mo is the highest and the anomaly scale is the biggest;the anomaly significance index of Au is the second.

关 键 词：中国西北地区 地球化学分区 异常显著度 地球化学景观 地球化学异常特征 

分 类 号：P595[天文地球—地球化学]