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投稿时间：2022-10-19 修订日期：2023-09-04 网络发布日期：2023-11-01
中文摘要:为实现黔西南紫木凼金矿床矿体的空间展布并分析成矿过程，利用3DMine建模软件对紫木凼金矿床三维地质模型进行了可视化构建。基于大量剖面和钻孔资料，结合矿床地层、岩性、构造等地质特征及已有成矿物质来源、流体来源等研究结果，通过矿床地质、构造、矿体展布之间的关系，建立了金矿床的空间展布模型，并分析了紫木凼金矿床成矿过程。结果表明：① Au的富集展布和规模受地层与构造影响明显，表现为上部矿体主要沿F1断层蚀变带产出，品位沿断层蚀变中心向周围递减，下部矿体主要赋存于龙潭组（P2l）层间破碎带中，背斜轴部矿体品位较高；② Au的富集成矿过程为：含Au热液沿深大断裂上升至龙潭组（2l）层间破碎带时，因温度、压力等因素导致热液中部分Au顺层沉淀。残余热液继续上升至F1断层处与其他流体混合并与围岩反应，因流体压力降低、pH值显著增高等因素使Au沿F1断层蚀变带沉淀；③基于紫木凼金矿床三维地质模型的构建和Au的富集成矿过程分析，归纳为紫木凼金矿床“热液运移-流体混合-断层沉淀”的成矿模式，对探究中国卡林型金矿床成因及成矿预测提供一定参考。
Abstract:In order to understand the spatial distribution of the ore bodies and analyze the ore-forming process of the Zimudang gold deposit in Southwestern Guizhou, a 3D geological model of the deposit was constructed visually using 3DMine modeling software. Based on a large number of geological sections and borehole data, the spatial distribution model of the gold deposit was established and the metallogenic process of the deposit was analyzed by combining the geological characteristics of the deposit stratigraphy, lithology and structure, as well as the results of the existing research on the sources of ore-forming materials and fluids. The result shows that: ① the distribution and scale of gold enrichment in the stratigraphy are obviously influenced by the stratigraphy and structures, the upper ore bodies mainly occur along the F1 fault alteration zone, and the gold grade decreases outward from the fault alteration center, while the lower ore bodies are mainly located in the interlayer fracture zones of the Longtan Formation (P2l), and the gold grade is higher in the places close to anticline axis; ② the gold minera-lization process is as follows:the gold-bearing hydrothermal fluid rises along the deep large fracture, when the interlayer fracture zones of the Longtan Formation (P2l) is reached, part of the gold in the hydrothermal fluid preci-pitates along the layer due to temperature and pressure factors. The residual hydrothermal fluid continues to rise to the F1 fault where it mixes with other fluids and reacts with the surrounding rocks, causing gold precipitation along the F1 fault alteration zone due to factors such as lower fluid pressure and significantly higher pH. Based on the construction of the three-dimensional geological model of the Zimudang gold deposit and the analysis of the gold mineralization process, the mineralization model of "hydrothermal transport-fluid mixing-fault precipitation" of the Zimudang gold deposit is summarized, which provides some reference for exploring the genesis of the Carlin-type gold deposit in China and making the next mineralization prediction.
keywords:Carlin-type gold deposit Three-dimensional geological modeling Mineralization analysis Zimudang gold deposit
HUANG YongZhi,ZOU NiuNiu,TIAN Feng,FU Yong,Lü HuanZe.2023.Three-dimensional geological modeling and mineralization analysis of Zimudang gold deposit in southwestern Guizhou[J].Mineral Deposits42(5):927~944