| The dome in Ping Village is located in the junction of Dafang County, Jinsha County and Qianxi County in northwest Guizhou Province. The region belongs to the interior area of the upper Yangtze Continent in South China plate. The dome in Ping Village is located in the northern margin of “central Guizhou upwarping”, get close to northern depression area and belongs to Dafang-Qianxi eastern weakly-changed block.All kinds of dome structures in “central Guizhou upwarping” are composed of base and cap rock. Moreover, regional structure movement has the multi-cycle and multi-phase characteristics. It has been attracting numerous geologists to study all the time and has acquired excellent geological findings. This area not only develops the dome structure, but also has abundant mineral resources. Predecessors have studied the area for many times, but seldom people have acquired achievements in 3D geological model.In the paper, by conducting a field geological survey on the dome in Ping Village and surroundings and combining with research data of predecessors, the author uses GOCAD software to conduct 3D modeling on the dome structure in Ping Village and conducts corresponding 3D mineral modeling on the lower bauxitic clay stratum in Liangshan formation of the dome in Ping Village. By analyzing and explaining 3D modeling, the author can acquire some achievements in studying the dome structure in Ping Village.The GOCAD 3D modeling software is used in this modeling. The advantages of this software lie in using DIS method to do calculus of interpolation, selecting and changing the grid model freely and automatically and being easy to use. Modeling steps of this software are relatively simple. Constructive modeling is also conducted in the form of working process.Due to single geology in the research area and lack of some data, including earthquake, geophysical prospecting and chemical prospecting, modeling steps of traditional GOCAD software construction may not be sutiable for this modeling. As a result, geologic maps, geological section, attitude of stratum and formation thickness are used to speculate the dome structure in Ping Village and deep features of othergeologic body. Then the working process of component modeling is improved and optimized to realize rapid operation and construction of 3D geological model. Finally,3D geological model of the dome in Ping Village and 3D mineral model of bauxitic clay stratum in Liangshan formation are completed.GOCAD 3D modeling software provides multiple methods to realize z-axis zoom, rotation, segregation, uncovery, individual display, geological map or remote sensing map projection on 3D geological model of the dome in Ping Village. By conducting transverse section cutting with different depth of the dome in Ping Village,the author analyzes geometrical features and constructive features in different areas and depth of the dome in Ping Village, also conducts 3D mineral modeling on bauxitic clay stratum in Liangshan formation of the dome in Ping Village, cuts ore body with different depth, as well as calculates volume and area of ore body correspondingly.Finally, by combining with experience summarized in the construction process of3 D modeling and by virtue of research findings of predecessors, the author briefly discusses the spatial morphological analysis, drilling, data introduction of geophysical prospecting, real-time monitoring of mines, slop treatment of diggings in mineral resource exploration and development for GOCAD 3D geological modeling. The author thinks that GOCAD software has some advantages in mineral exploration and3 D geological modeling. Thus, its application prospect is extensively wide. |
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