中蒙边界地区汇水域沉积物69种元素的背景值  

Background values of 69 elements in catchment sediments of the China-Mongolia boundary region

作　　者：刘汉粮 聂兰仕[1,2,3] SHOJIN Davaa 王学求[1,2,3] 迟清华 LIU Hanliang;NIE Lanshi;SHOJIN Davaa;WANG Xueqiu;CHI Qinghua(Key Laboratory of Geochemical Exploration,Ministry of Natural Resources,Langfang 065000,China;Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang 065000,China;UNESCO International Centre on Global-scale Geochemistry,Langfang 065000,China;Geological Investigation Center,Mongolia,Ulaanbaatar P.Box-318,Mongolia)

机构地区：[1]自然资源部地球化学探测重点实验室,河北廊坊065000 [2]中国地质科学院地球物理地球化学勘查研究所,河北廊坊065000 [3]联合国教科文组织全球尺度地球化学国际研究中心,河北廊坊065000 [4]Geological Investigation Center,Mongolia,Ulaanbaatar P.Box-31

出　　处：《地学前缘》2020年第3期202-221,共20页Earth Science Frontiers

基　　金：国家重点研发计划项目(2016YFC0600600);中国地质调查局地质调查项目(DD20160116,DD20190450,DD20190451)。

摘　　要：中蒙边界地区成矿地质条件优越,是世界上重要的金属成矿省和全球3大斑岩型铜(金、钼)成矿带之一,资源潜力巨大。中蒙合作1:100万地球化学填图采集了海量的地球化学数据,为研究该地区元素分散富集、成矿趋势、资源评价和环境变化提供基础数据,为"一带一路"资源布局提供决策依据。以X±3S为临界值一次性剔除离群值后的数据集的中位值作为背景值的估计值,计算了中蒙边界地区12个Ⅱ级构造单元和5个Ⅱ级成矿省的汇水域沉积物69种元素背景值,探讨了中蒙边界地区汇水域沉积物69种元素背景值的区域分布规律和特征。研究表明不同的地质背景导致元素的地球化学分布模式不同,不同构造单元具有显著差异的元素地球化学特征,元素的海量聚集为大型矿床的形成提供了充足的元素供给,形成特定的地球化学省。这些背景值为进一步深入开发利用中蒙边界地球化学填图数据提供了可供对比的基础数据。The Sino-Mongolian border area has excellent ore-forming geological conditions and is one of the world’s important metal mineralization provinces and one of the world’s three major porphyry copper(gold and molybdenum)metallogenic belts.We collected a large amount of geochemical data from the SinoMongolian cooperation project on a geochemical mapping at 1:1000000 scale,which provides basic data for the study of elemental dispersion and enrichment,mineralization trends,resource evaluation and environmental changes in the border area,and also supports decision making in resource layout for the‘One Belt One Road’.We calculated background values of 69 elements in catchment sediments based on the mapping data across the China-Mongolia boundary.We used the median values of the dataset(using 3-sigma control limits)as the estimated geochemical background values.The results showed that different geological backgrounds led to different geochemical distribution patterns,and different tectonic units had significantly different geochemical characteristics.The massive elemental accumulation provides sufficient elemental supply to forming large deposits of specific geochemical province.These background values can be used as the basic reference data for comparing further development and utilization of geochemical mapping data across the China-Mongolia boundary.

关 键 词：69元素背景值 汇水域沉积物 区域浓集系数 地球化学填图 中蒙边界 

分 类 号：P595[天文地球—地球化学] X142[天文地球—地质学]