| The Xiangshan volcanic basin is an important producing area of volcanic rock-type uranium deposits in China.Since the discovery of anomalous points by aerial survey in August 1957,nuclear industry systems and some universities have carried out a large number of uranium geological surveys,explorations,and scientific research work in this area.After more than 60 years of exploration,a number of large and medium-sized uranium deposits have been discovered in the basin,which occupies an important position in China's current uranium reserves,and is an important base for uranium mining in China.Identifying the basic structural features of underground space and enhancing the understanding of geological structures and establishing a three-dimensional geological visualization model are very important for further evaluation of mineral resources and underground space management.This article relied on the “Longcan Project” subproject of China National Nuclear Corporation,which was undertaken by the mentor,and applied GOCAD software to establish a three-dimensional geological model of Yunji exploration area.Based on this model,combined with geological information and geophysical data,the analysis and recommendations of the mine provide help for future geological survey work.The main results and conclusions are as follows:(1)This paper collects relevant geology and geophysical information and data of Yunji exploration area,including AMT survey line(point)data,drilling data,contour data,geological map raster data and remote sensing image raster data in the exploration area.On this basis,data processing and analysis were carried out,and the AMT data section and drilling database in the exploration area of Yunji were established,and the three-dimensional visualization of related data was realized.(2)Through the correction of the AMT data inversion profile,the cutting and correction of the geological map,and the calculation and projection of the borehole exposure point,they were integrated into the Map GIS platform and a comprehensive interpretation platform for the AGIS profile Map GIS geology-geophysics was established.(3)Through the collection of rock property parameters in the Xiangshan volcanic basin and the analysis of geological information,it is concluded that the unconformity interface is a near-continuous or trend-connected lowest-viscose resistivity anomaly zone,and the interface between the groups is characterized by low resistance-high Gradient-gradient zone,fracture structure in the TM mode inversion of the apparent resistivity profile,manifested as a vertically spreading low-resistance anomaly zone or a high-low resistance gradient zone,followed by a step-by-step iterative refinement interpretation-inversion step as a principle of comprehensive interpretation,24 AMT sections of the exploration area were systematically interpreted.(4)Using GOCAD three dimnesional geological modeling software platform,using contour data,AMT data geophysics-geological interpretation data as the basic data for three dimnesional geological modeling,established a digital elevation model for the surface of Yunji exploration area,and a faulted tectonic surface.Four types of surface models,such as the unconformity interface(Qb-K1)and the inter-group interface(K1d-K1e),were then used to establish a three-dimensional solid model in the exploration area of Yunji.(5)Through the observation and analysis of the model,combined with geological information,it is considered that the abrupt change zone of the interface between the unconformity interface and the group is a favorable metallogenic site.Along the volcanic collapse structural zone of Yunji exploration area,there is a huge prospecting potential,and the corresponding prospecting and mining work can be carried out. |
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