Three-dimensional Model Analysis and Deep Prognosis of the Jiama Copper-polymetallic Deposit in Tibet
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摘要: 西藏甲玛铜多金属矿床位于拉萨东约68 km 处,是冈底斯成矿带内与斑岩成矿作用有关的斑岩-矽卡岩-角岩型铜多金属矿床。本文以矿床成矿系列和成矿地质异常理论为指导,开展了矿田构造分析、地球化学元素分带研究。文章运用三维建模及可视化技术建立矿区三维矿床模型,通过曲面模拟方法提取矿区控矿构造界面,查明了矿区构造界面对 Cu、Mo、Ag、Au 等元素的富集有绝对控制作用;矿区地球化学元素分带表现为浅部 Pb、Zn 至深部 Cu、Mo 的变化特征,矿区成矿中心空间位置的探讨说明矿区在ZK1616-ZK3216一带的深部存在隐伏含矿斑岩体。Abstract: Located about 68 km away from the east of Lhasa in Tibet, the Jiama copper polymetallic deposit is a porphyry-skarn-hornfels type copper-polymetallic deposit related to the ore-forming process of porphyry in the Gangdise metallogenic belt. Guided by the metallogenic series and ore-forming geological anomaly theory, this paper analyzed ore field structures and elements zoning. The authors used three-dimensional modeling and visualization technology to build its 3D deposit model, applied the surface simulation method to extract ore-controlling structure interface of the mining area, and proved that the structural interface had completely controlled the enrichment of Cu, Mo, Ag, Au. The elements zoning studies have shown the variation that shallow Pb, Zn change to deep Cu, Mo. The discussion on the spatial position of the metallogenic center shows that it is possible to find concealed porphyry ore bodies in the depth of ZK1616-ZK3216 area.
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