Nonlinear response mechanism of vertical migration of elements in Yashan desert covered area
The shallow covered area has great prospecting potential,but the overburden will weaken the deep mineraliza-tion information,which makes it difficult to carry out effective exploration by conventional geochemical exploration meth-ods.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 ar-ea 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 type Ⅱ drilling(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 type Ⅱ drilling 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 mi-gration 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 re-sults can provide ideas for the use of shallow drilling geochemical exploration technology to carry out prospecting and ex-ploration in shallow covered areas,and provide a basis for the evaluation of regional metallogenic potential and the de-ployment of prospecting projects in covered areas.
desert covered areavertical migration of elementsmultifractalnonlinear responsepenetration mechanism
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