Comprehensive Application Of Geophysical Prospecting Methods In The Investigation Of Jiajika Rare Metal Ores

With the increasing attention to strategic resources and mineral resources(rare metals)at home and abroad,the exploration of rare metal minerals has increased in recent years,and rare metal mineral exploration work is going underground to concealed mines,deep mines,and small-scale mines direction of development.The geophysical comprehensive exploration model established in the context of metallogenic theory is a comprehensive exploration model of solid minerals under multi-method,multi-parameter and multi-scale mode,which can effectively overcome the inconsistency of geology and geophysical multiplicity.And other scientific issues.“The type of Jiajika” rare metal pegmatite ore field in western Sichuan is one of the largest solid lithium deposits in China and even in the world.The development potential of mineral deposits is huge,but under the new situation background,the center of gravity has turned from shallow surface to deep earth.The geophysical exploration method is based on the physical property difference(density,magnetic,electrical)characteristics of the underground medium.As a rapid,economic and effective exploration method that can indirectly reflect the media structure of the underground stratum,it is currently solving deep prospecting and blindness.An effective technical means for mine prediction and metallogenic model.Therefore,this paper is based on the typical ore field of methyl card rare metal,from the regional geological background,metallogenic regularity,prospecting mark,physical characteristics as the theoretical basis,through the comprehensive geophysical methods(gravity,magnetic method,electromagnetic method)practice research,summed up A geophysical comprehensive exploration model suitable for methyl card and similar ore-forming conditions is provided,which provides scientific exploration methods and exploration modes for methyl card prospecting evaluation.Through the research of this paper,the technical system of comprehensive geophysical prospecting method in the region is theoretically perfected.In practice,it provides direction guidance for prospecting of ore fields and peripheral mining areas,and provides corresponding technical support and exploration demonstration for the rapid breakthrough of rare metal minerals.To meet the country's strategic requirements and market needs.This paper mainly focuses on the comprehensive application of gravity,magnetic and electromagnetic methods in the exploration of methyl card rare metal ore fields.It mainly carries out comprehensive research work from the following four aspects,in order to obtain a comprehensive,systematic and scientific understanding.This paper has certain practical significance for the deep exploration capability of geophysical methods and the practical application of deep prospecting in methyl card mines:1.Based on the regional geological structure background,regional gravity and magnetic characteristics.The characteristics of physical properties in the study area are summarized: magmatic rocks(granite,pegmatite)have low gravity,low magnetic and high resistivity characteristics;surrounding rock(schist)has high gravity,high magnetic and low resistivity characteristics.2.From the geophysical model and characteristics of the study area,the finite element method forward numerical simulation is used as the means,and the forward and inversion of the audio magnetotelluric(AMT)sounding is carried out based on the physical characteristics.Studies have shown that in the presence of granite or pegmatite high-resistance anomalies,the TM mode produces large distortions in the longitudinal direction and good resolving power in the lateral direction,while the TE mode produces distortion in the lateral direction.Large,with good resolution of longitudinal anomalies,but the vertical resolution will decrease as the depth of exploration increases.3.The distribution position and scale of the main rock mass are delineated by the data processing of gravity and magnetic plane,the measurement results of the audio geomagnetic profile and the geological survey of the surface.Basically understand the deep geological structure characteristics of the study area,and delineate the spatial distribution of granite,and conclude that the pegmatite veins and granite bodies are connected in the deep part,and the main geological structure frameworks in the study area are sketched.The ore-forming area is divided.4.Through the comprehensive research and application of heavy,magnetic and electric power to the research area,the technical combination of optimization methods is used to roughly identify the deep geological structural features,stratigraphic distribution and spatial distribution characteristics of pegmatite veins in the region.A set of geological-geophysical mineral exploration models that are effective in the region have been established to provide geophysical data support for the construction of deep tectonic frameworks and prospecting predictions for methyl card rare metal ore fields.