Judgment And Identification The Source Of Surface Geochemical Anomalies In Concealed Deposit

With the increasing demand for mineral resources,the serious shortage of mineral resources in China needs to be solved urgently.After decades of prospecting and exploration in the exposed area,the possibility of finding new mineral deposits is declining,while the large deposits would more probably be found in covered areas.With the burial depth of the ore body and the impact of the overburden layer,the information on the surface geochemical anomalies will be weakened in the covered area.As result,it has been a long-term problem to capture and identify the weak geochemical information on the surface of the overburden area with the exploration of concealed mines.In recent decades,penetrating geochemical exploration methods has been rapidly developed.Although these penetrating geochemical exploration methods can better indicate the geochemical anomalies in the covered area,deep-penetration geochemistry is still controversial in fundamental research and application for lack of authentic evidence to prove the anomaly information captured for earth's surface are from deep concealed deposits.Based on the above reasons and current research status,this paper conducts research on the judgment and identification of the information source of surface geochemical anomalies in the Yueyang Silver Polymetallic Mine in Zijinshan,Fujian Province,which has been covered by volcanic rocks and achieved ideal results.Through targeted collection of ore,geogas and soil samples above the ore body and in the background area,it provides direct evidence for determining the source of information on the surface geochemical anomalies of concealed deposit from different perspectives of element content,distribution,and particle morphology and composition characteristics,that is,the deep mineralization information is reflected by the comparison of the soil and the geogas element composition with the main mineralization elements,the spatial distribution of the elements and the occurrence of the ore body,and the geochemical characteristics of the geogas nanoparticle are compared to determine the source of geochemical anomalies in the covered area.By comparing the composition and spatial distribution characteristics of ore-forming elements and associated elements,it is found that the use of soil fine-grain separation technology and geogas measurement technology can find geochemical anomalies caused by concealed ore bodies in the volcanic rock coverage area.The particle samples prepared by physical separation are similar to the geogas samples in terms of particle composition and microscopic characteristics.It is believed that these metal particles have homology and are the product of endogenous effects.Nanoparticles generated in the source area are easy to migrate to the surface due to their high diffusivity.Combined with the analysis of the geological characteristics of the mining area,there are abundant structural fissures in the Yueyang volcanic rock coverage area.It is believed that the geogas plays a leading role in the migration of nanoparticles from the ore body to the surface.And the migration model of abnormal elements in the volcanic rock basin was established.The nanoparticles in the soil and geogas can reveal deep mineralization information.Which is one of the forms of mineralization and associated elements in the surficial environment,and one of the abnormal material forms extracted by penetrating geochemical technology in the covered area.Because of its stable nature,it can be used as a geochemical tracer for tracing the source area.The results of this study will consolidate the theoretical foundation of deep penetration geochemistry and provide support for its further application in concealed mineral exploration.