| Citation: | TIAN Yiping，WU Chonglong，ZHANG Xialin，et al. Three-dimensional modeling and visualization analysis of primary exhalative–sedimentary cycles of Gaodi–Daotuo manganese deposit, Guizhou Province[J]. Bulletin of Geological Science and Technology，2026，45（3）：1-11 doi: 10.19509/j.cnki.dzkq.tb20250008
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To verify the new metallogenic model of "manganese-bearing gas-liquid diapir exhalative-sedimentation and quasi-syngenetic multiple charging composite mineralization" for the Datangpo-type manganese deposit, this study takes the Gaodi-Daotuo super-large rhodochrosite deposit in Guizhou Province as the research object to conduct fine modeling of exhalative-sedimentary cycles and three-dimensional (3D) visualization analysis, aiming to reveal the ore-forming laws of the deposit and provide direct support for the deep and peripheral metallogenic prediction of such deposits.
First, the drill cores (ore cores) in the ore-bearing segment of each exploration line of the deposit were divided and correlated for sedimentary cycles, and a series of profile maps of manganese-bearing fluid exhalative-sedimentary cycles were compiled. On this basis, a 3D structural model of sedimentary cycles was constructed by adopting the method combining sedimentology knowledge-driven serial profile topological reasoning and layer surface modeling. Meanwhile, combined with the Triangulated Irregular Network-Corner Point Grid (TIN-CPG) hybrid data model, a 3D attribute model of manganese content was established by using the multi-point geostatistical random attribute modeling method based on Corner Point Grid (CPG), and finally an integrated 3D geological model with coupled structure and attribute was formed.
This study successfully constructed an integrated 3D model of five stages of exhalative-sedimentary cycles in the study area. Through 3D visualization analysis including layered visualization, vector clipping and geological statistical analysis, the stages, intensity variation and mineralization process of manganese-bearing fluid exhalative-sedimentation in the deposit were directly and vividly revealed: the exhalative activity was relatively weak in the first cycle, while the third and fourth cycles had the strongest exhalative intensity, where the high-grade manganese ore bodies (Mn≥25%) were mainly concentrated. The multi-level verification results show that the fine modeling method of exhalative-sedimentary metallogenic cycles is scientifically feasible. The distinctive features of this study lie in the proposed 3D structural reasoning modeling method for multi-stage sedimentary cycles driven by sedimentology knowledge, as well as the constructed 3D geological model that reflects multi-stage fine exhalative-sedimentary cycles.
The research results not only provide intuitive visual evidence for the new metallogenic model of Datangpo-type manganese deposit, but also reveal the unique exhalative-sedimentary metallogenic environment, spatial characteristics and ore-forming process of this super-large manganese deposit from the 3D visualization perspective, which is helpful for understanding the ore-forming mechanism, occurrence and distribution characteristics of the deposit, and provides a structural-attribute integrated 3D geological model for the subsequent deep and peripheral metallogenic prediction of such deposits.
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