云南金顶矿床矿体三维模型的建立及其研究意义

利用澳大利亚Surpac公司的三维立体制作软件将“金顶铅锌矿详细勘探地质报告”中的318个钻孔、14多万个数据和49张勘探线剖面图等资料,首次做出了可从任意角度观察的金顶矿床矿体三维空间实体模型.铅锌矿体展示了穹隆状分布特征,（硬）石膏、天青石矿体在空间上展现了残余盐丘的某些特点,为盐丘破坏、油气逃逸形成超大型铅锌矿的模式提供了佐证.文章初步讨论了砂岩型矿体和灰岩角砾岩型矿体的关系.

Construction of a three_dimensional model for orebodies of Jinding depoist, Yunnan Province, and its significance in geological study

Jinding deposit is located in the northern part of Lanping basin, western Yunnan Province. It has been studied for more than 20 years, and a lot of genetic models have been proposed, such as stratabound origin and mantle-crust compound mineralization. But there are not any models which can clearly illustrate spatial shapes of the orebodies. In order to build a three-dimensional model, the authors used more than 140000 data from 318 drill holes and geological sections along 49 exploration lines and employed Surpac software. The model can rotate at any angles and output any directional cross sections according to the purposes required. There are four types of orebodies in this model, i. e., gypsum/anhydrite, celestite, sandstone-type Pb-Zn ores and limestone brecciatype Pb-Zn ores. It disptays clear spatial shapes of orebodies as well as their relationships. The sandstone-type lead-zinc orebodies occur as a mushroom-shaped dome, and are distributed in irregular layers at the top of the mushroom. The shapes of celestite and gypsum/anhydrite orebodies under the sandstone-type lead-zinc orebodies show certain characteristics related to a remnant salt dome. In addition, the limestone breccia-type orebodies occur as lenses and veins comprising the root of the mushroom, where they serve as the channels of metallogenic fluids. These phenomena offer some evidence for the genetic model of Jinding deposit, i.e., the mineralization of the Jinding giant zinc-lead deposit may be related to oil-gas escaping and salt dome splitting.