| Understanding of three-dimensional underground geologic structure is an important basis for recognize geology and mineralization processes.The three-dimensional geological geophysical modeling techniques provides an opportunity to understand certain depth (3km-5km) and the structure of underground formations, rock spatial distribution relations.The study as the basis of special of national science and technology projects,"Three-dimensional exploration of mineral resources in deep technical and experimental (SinoProbe-03)".Lujiang-Zongyang ore district was selected as the study area in this paper, we using integrated geological and geophysical data as the basis for ore district dimensional modeling in order to understand deep three-dimensional structural characteristics of ore district.In this paper the geological data, gravity and magnetic data, seismic reflection profiles of Lujiang-Zongyang ore district had been used to construct the3D geological and geophysical model. The initial realization of Lujiang-Zongyang ore district5km depth geological structure had been deepened the region mineralization, ore understanding of the structure and some progress had been made in this study:This study presents appropriate technical processes for three-dimensional geological and geophysical modeling for Lujiang-Zongyang ore district. Firstly, the seismic profiles are prepared for construct the initial3D model, then the initial model was cut into the two-dimensional sections modified one by one until full compliance with the surface geology of the study area. Then the initial model for gravity inversion fitting profiles one by one, through further amendments interactive3D models. The biggest advantage of this method is that one can maximize the integration understand of modelling ore district geological and geophysical characteristics.In the modelling process, the different periods were integrated stratigraphic division and merging programs, carried out statistical studies the physical properties and determine the stratigraphic and intrusive rocks density inversion fitting as the basis. Various regional-residual separation methods had been used to carry out and finally high-pass filtering been choosed to the final separation results as potential field inversion modeling data. According to interpretation of five seismic profiles acrossed Lujiang-Zongyang ore district, the volcanic basin boundary structural framework based on seismic reflection characteristics was divided into two parts, north and south, suggesting that two lines parallel to the reflection seismic fault is the north-south regional dividing line between the two parts. The distribution characteristics of seismic profiles contribute to provide information to target porphyry and skarn deposits.Finally, the deformation range of rock in depth and key fault strike had been revealed by using seismic reflection profiles under gravity inversion constrained fitting inversion. The3D geological and geophysical model of Lujiang-Zongyang shows the3D structure of the basin, particularly related to mineralization of rock formations and spatial distribution law for further prospecting work. |
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