The Study Of The Integrated Geophysical Method To The Deep Prospecting In Dengjiashan Ore District

Compared with traditional geological prospecting, geophysical exploration technologies take more advantage in the process of a new round of deep solid mineral exploration that has become the core of the deep mineral exploration technology.Jiurui ore district is one of seven ore fields in the Yangtze River metallogenic belt,mineral exploration work in the mineralization zone are mainly concentrated in the first deep space(0~500m), and the deep metallogenic prediction is still in the stage of exploratory. Predecessors had conducted a lot of systemic research to ore deposit geology conditions, characteristics and genesis of ore fields, mineral and geochemical exploration in the Dengjiashan ore district, holding that it can be a major breakthrough in the mining area of deep prospecting. Therefore, this paper takes Dengjiashan ore district as an example to carry forward integrated geophysical method research to provide technique and reference for the detecting of deep mining.The paper summarized metallogenic geological setting of Dengjiashan ore district on the basis of summarizing regional geology and geological features of Jiurui ore deposit, and concluded the metallogenic regularity that composed of 1)the main controlling factor is E-W closed fold and fracture undergone multi period structural movement;2) the type of deposits is controlled by the lithologic differences of the ore structure between rock mass and surrounding rock contact zone, interlayer fracture zone, fault fracture zone, structural fissure zone, clastic rocks and carbonate rocks. In order to conduct the study of deep prospecting approaches, we had collected the stratum, rock density, magnetic susceptibility and electrical resistivity of Dengjiashan ore district, and completed processing and interpretation of the collected data from gravity, magnetic, CSAMT, AMT and TDIP. After filter, continuation, and 3D Euler deconvolution of gravity and magnetic data, we gave the general characteristics of gravity and magnetic field, source distribution, buried depth and direction of Dengjiashan ore district combining with geological material, which provided the powerful basis for the delineating mineralization regional and ore-controlling structure. Moreover, we conducted the 2D NLCG inversion of the CSAMT and AMT data and compared their inversion results with TDIP result combining geologic information to obtain the fact that the application of CSAMT is more favorable well.We took the inversion result of CSAMT incorporated with geology and gravity and magnetic data into geological and geophysical comprehensive interpretation, and thefinal result shows that F10 of overturned anticline of Baoxia-huangbaiyan is the rock chung channel, and the interface of Permian and Triassic stratigraphic provides favorable conditions for the migration and mineralization of magma.The paper summarized the composition methods used for prospecting deep deposites in Jiurui ore district by means of the study of the integrated geophysical methods in Dengjiashan ore district, which offers technical reference for similar exploration.