水系沉积物元素地球化学特征 对区域剥蚀程度评价的指示: 以青海省东昆仑大场金矿田为例  

Indication of elements geochemical characteristics of stream sediment to evaluation of regional denudation degree:A case study of the Dachang gold ore field in east Kunlun,Qinghai Province

作　　者：詹小飞 魏俊浩[1] 王震 Zhan Xiaofei;Wei Junhao;Wang Zhen(School of Earth Resources,China University of Geosciences(Wuhan),Wuhan 430074,China;Department of Natural Resources of Heilongjiang Province,Haerbing 150090,China)

机构地区：[1]中国地质大学(武汉)资源学院,武汉430074 [2]黑龙江自然资源厅,哈尔滨150090

出　　处：《地质科技通报》2021年第2期176-185,210,共11页Bulletin of Geological Science and Technology

基　　金：中国地质调查局地质调查项目(1211201004000160901-65)。

摘　　要：利用水系沉积物测量元素地球化学的相关特征,对青海东昆仑大场金矿集中区开展矿床、矿田尺度的剥蚀程度研究,可以为评价区域成矿潜力提供有力支撑,具有快速、有效、低成本的优点。选取青海省东昆仑大场金矿田的1∶5万水系沉积物测量数据进行了处理和分析,以热液渗滤晕分带理论为指导,依据区内金矿床原生晕在空间的分带性和次生异常的结构相似性,建立了整体成矿元素分散流与原生晕共性的元素组合和元素分带序列,分别采用了元素比值法、三角图解法和元素分带序列法来选取区域剥蚀程度评价参数,并结合实地地质矿产特征,评价了大场金矿田及周边地区7个异常区的剥蚀程度大小。研究结果表明:扎拉依北、格涌贡玛、东达哈日乌拉、照大额北地区的剥蚀程度较高;旁海、启得喜然地区的剥蚀程度中等;扎拉依-大场、照大额南地区的剥蚀程度一般;同时利用水系沉积物元素地球化学特征,多种评价指标的对比使用,可以有效快速地对区域剥蚀程度开展评价,为成矿潜力评价提供支持,对找矿勘查具有十分重要的指示意义。Using the elements geochemical characteristics in stream sediments survey,have the advantages of yofast,effective and low cost in different scale evaluation of denudation degree in Dachang gold ore field in east Kunlun,Qinghai Province.It also provides strong support for evaluating the regional metallogenic potential.We take a case study of the data of 1∶50000 stream sediments survey in the Dachang gold ore field for processing and analysis,which is based on the theory of hydrothermal percolation halo banding,and the spatial zoning of the primary halo and the structural similarity with secondary anomalies of gold deposits in the area.Besides,we build the element association and elemental banding sequence with common features between the common mineralization element dispersed train and the primary halo.Three methods,including the elemental ratio method,the triangular graphic method and the elemental banding sequence method are used to set up the evaluation parameters of regional denudation degree.Finally,combined with the characteristics of the geology and mineral resources in the field,the denudation degree of 7 anomalous areas in the Dachang gold ore field and surrounding areas is evaluated,and it is believed that the denudation degree of Zalayibei,Geyonggongma,Dongda Hariwula,and Zhaodaebei areas is higher;the degree of denudation in the Dexiran area is medium;the degree of denudation in the Zarayi-Dachang and Zhaodaenan areas is lower.Meanwhile,it is believed that the use of the elemental geochemical characteristics of stream sediments and the combined use of multiple evaluation indicators can effectively and quickly carry out a moderate evaluation of the degree of regional denudation,provide support for the evaluation of mineralization potential,and have very important indications for prospecting and exploration.

关 键 词：水系沉积物 东昆仑大场金矿田 剥蚀程度 次生异常 元素分带性 

分 类 号：P632[天文地球—地质矿产勘探]