雅山荒漠覆盖区元素垂向迁移非线性响应机理  

Nonlinear response mechanism of vertical migration of elementsin Yashan desert covered area

作　　者：孟繁兴 谢淑云[2] Meng Fanxing;Xie Shuyun(Hubei Institute of Geological Prospecting Equipment,Wuhan,Hubei 430034;China University of Geosciences,Wuhan,Hubei 430074)

机构地区：[1]湖北省地质勘查装备中心,湖北武汉430034 [2]中国地质大学(武汉),湖北武汉430074

出　　处：《资源环境与工程》2024年第5期533-543,共11页Resources Environment & Engineering

基　　金：荒漠覆盖层成矿元素垂向迁移的非线性响应机理研究(41872250)。

摘　　要：浅覆盖层地区仍具有很大的找矿潜力,但覆盖层会弱化深部矿化信息,使得常规化探方法效果不佳,为有效提取深部矿化信息,需查明成矿元素在覆盖层中的垂向迁移规律。以新疆雅山荒漠覆盖区一处Cu-Mo综合异常区为研究区,采用浅钻采集覆盖层土壤样品,检测其矿物成分及As、Cu、Pb、Mo等元素的总量和相态,分析成矿元素的多重分形特征,探讨其垂向迁移的非线性响应机理。矿物成分分布模式和元素R型聚类分析表明,5个浅钻可分Ⅰ类钻孔(ZK01、ZK02、ZK03)和Ⅱ类钻孔(ZK04、ZK05),分别为底部基岩为二长花岗岩、凝灰岩的土壤环境。元素总量多重分形分析表明,Ⅱ类钻孔环境更有利于元素的垂向迁移,与该类钻孔所处的凝灰岩母岩环境相符合,说明多重分形方法可以定量表征元素的垂向迁移能力。元素相态多重分形分析表明,Cu主要以离子态形式迁移,Mo主要以铁锰氧化物态迁移,深部矿体与元素垂向迁移形成的地表地球化学异常之间存在非线性响应过程。研究成果可为利用浅钻化探技术开展浅覆盖区找矿勘查提供思路,并为区域成矿潜力评价、覆盖区探矿工程部署等提供依据。The shallow covered area has great prospecting potential,but the overburden will weaken the deep mineralization information,which makes it difficult to carry out effective exploration by conventional geochemical exploration methods.In order to effectively extract the deep mineralization information,it is necessary to find out the vertical migration law of ore-forming elements in the overburden.Taking a Cu-Mo comprehensive anomaly area in the Yashan desert covered area in Xinjiang as the study area,the soil samples of the overburden were collected by shallow drilling,and the mineral composition and the total-content and phase state of As,Cu,Pb,Mo and other elements were detected.The multifractal characteristics of ore-forming elements were analyzed,and the nonlinear response mechanism of vertical migration was discussed.The mineral composition distribution pattern and element R-type cluster analysis show that the five shallow drilling can be divided into type I drilling(ZK01,ZK02,ZK03)and typeⅡdrilling(ZK04,ZK05),which are the soil environment with the bottom bedrock being monzonitic granite and the soil environment with the bottom bedrock being tuff,respectively.The multifractal analysis of the element total-tentcon shows that the typeⅡdrilling environment is more conducive to the vertical migration of elements,which is consistent with the environmental characteristics of the tuff parent rock in which the drilling is located,indicating that the multifractal method can quantitatively characterize the vertical migration ability of elements.The multifractal analysis of element phase states shows that Cu mainly migrates in the form of ionic state,Mo mainly migrates in the form of iron-manganese oxide,and there is a nonlinear response process between the deep ore body and the surface geochemical anomalies formed by the vertical migration of elements.The research results can provide ideas for the use of shallow drilling geochemical exploration technology to carry out prospecting and exploration in shallow covered a

关 键 词：荒漠覆盖区 元素垂向迁移 多重分形 非线性响应 穿透性机理 

分 类 号：P632.1[天文地球—地质矿产勘探] P628.1[天文地球—地质学]