青海察汗乌苏河地区水系沉积物地球化学特征及地质意义  

Geochemical characteristics and geological significance of stream sediment in Chahanwusu River Area,Qinghai Province

作　　者：郑振华 李文君 李笑龙 张声桃 何俊江 ZHENG Zhenhua;LI Wenjun;LI Xiaolong;ZHANG Shengtao;HE Junjiang(Qinghai Geological Survey,Xining 810000,China;The Third Nonferrous Geological Exploration Institute of Qinghai Province,Xining 810012,China;School of Earth Resources,China University of Geosciences(Wuhan),Wuhan 430074,China)

机构地区：[1]青海省地质调查局,青海西宁810000 [2]青海省有色第三地质勘查院,青海西宁810012 [3]中国地质大学(武汉)资源学院,湖北武汉430074

出　　处：《西安科技大学学报》2023年第2期312-321,共10页Journal of Xi’an University of Science and Technology

基　　金：青海省财政专项项目([2020]123)。

摘　　要：为减小西北干旱气候条件下岩屑介质分布不均匀、所获取的水系沉积物地球化学信息差异性明显、在区域尺度上存在元素的高低背景差异等因素对地球化学信息识别造成的干扰,以青海省东昆仑东段的察汗乌苏河地区水系沉积物地球化学数据为研究对象,分析察汗乌苏河地区12种地球化学元素分布特征,利用多重分形法的含量-面积分形法开展研究。结果表明:含量-面积分形法能客观地反映西北干旱地区地球化学分布特征并识别地球化学异常,降低了西北干旱地区物理风化严重和地表径流不稳定所导致岩屑介质分布不均的影响,可以不遗漏低背景值下的微弱异常,适用于西北干旱条件下的水系沉积物地球化学数据处理。结合区域地质背景所筛选的5处矿产远景区中已发现多个矿化信息,验证该方法的可靠性。含量-面积分形法是一种合理有效的地球化学数据处理方法,可以为西北干旱地区的矿产勘查工作提供有效线索。In order to reduce the disturbance of geochemical information recognition caused by the uneven distribution of debris medium,the obvious difference of stream sediment geochemical information obtained and the difference of high and low background of elements at regional scale under arid clima-tic conditions in northwest China,the geochemical data of the Chahanwusu River drainage sediments in the eastern section of the East Kunlun Mountains in Qinghai Province are taken as the research object.Through statistical analysis of the distribution characteristics of 12 geochemical elements in the Chahanwusu River Area,the content area fractal method of the multifractal method is used to carry out the research.The results show that this method can objectively reflect the characteristics of geochemical distribution and identify geochemical anomalies in the northwest arid region,and reduce the influence of uneven distribution of rock debris media caused by severe physical weathering and unstable surface runoff in the northwest arid region.In particular,it can not miss the weak anomalies in the low background value,and is suitable for the processing of stream sediment geochemical data in the northwest arid region.On this basis,multiple mineralization information has been found in 5 prospecting prospects screened by regional geological background,which fully verifies the reliability of this method.The research indicate that the content-area fractal method is a reasonable and effective method for geochemical data processing,which can provide effective clues for mineral exploration in the arid areas of northwest China.

关 键 词：地球化学勘探 水系沉积物 含量-面积分形法 东昆仑 

分 类 号：P632.3[天文地球—地质矿产勘探]