Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (3): 933-948.doi: 10.13278/j.cnki.jjuese.201703307

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Regional Metallogenic Geo-Bodies 3D Modeling and Mineral Resource Assessment Based on Geologic Map Cut Cross-Sections: A Case Study of Manganese Deposits in Southwestern Guangxi, China

Zhang Baoyi1,2,3, Yang Li1, Chen Xiaoyang1, Deng Hao1, Mao Xiancheng1   

  1. 1. MOE Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring/School of Geosciences & Info-Physics, Central South University, Changsha 410083, China;
    2. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074,China;
    3. Department of Geology & Geophysics, University of Utah, Salt Lake City, UT 84112, USA
  • Received:2016-08-29 Online:2017-05-26 Published:2017-05-26
  • Supported by:
    Supported by the Grants of the National Science Foundation of China (41302259, 41472302) and the Project of National Science and Technology Pillar Program During the 12th Five-Year Plan Period of China (2011BAB04B10)

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Abstract: The 2D quantitative mineral prediction based on the study of metallogenic laws and the analysis of metallogenic conditions cannot precisely deseribe the 3D spatial distribution of ore bearing strata, and results in the unreliability of prediction. Aiming at the real 3D geosciences analysis needs of the prediction and evaluation of mineral resources, taking planar geological map and geological cross-sections as the data source of 3D geological modeling, a wire frame modeling method is presented to reconstruct 3D surface of geological bodies according to profiles on cross-sections and planar map, and applied to describe the 3D spatial distribution of manganese geological bodies in southwestern Guangxi. Meanwhile, in order to analyze the 3D spatial distribution of manganese ore resources, the 3D geological space of the study area is divided into continuous field by regular voxels, and the 3D spatial distribution of manganese ore resources in the manganese bearing strata from 1 000 meters to the shallow is obtained on the basis of the regional manganese metallogenic 2D quantitative prediction results. The manganese ore resources in the study area are mainly concentrated in Upper Devonian (mainly in the Wuzhishan Group), 50 360 kiloton, and in the Beisi group of Lower Triassic, 34 470 kiloton, while the resource in the Datang Group of Lower Carboniferous is only 5 660 kiloton, which was over-estimated in the 2D prediction. The 3D geological modeling improves the reliability of the quantitative prediction of the manganese ore, and better reflects the controlling effect of the manganese bearing strata on the distribution of manganese ore.

Key words: geologic map cut cross-section, geo-bodies 3D modeling, manganese deposit, 3D predicted reserve

CLC Number: 

  • P612
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