矿床四维时空定量评价的新认识——以西藏玉龙斑岩铜矿床为例

大型、超大型斑岩铜矿的定量研究正在受到广泛关注,集中体现在现代矿产资源勘探模式趋向于从经验找矿、理论找矿和信息找矿3大传统找矿方法向集成信息技术方向发展。本项研究以青藏高原典型的玉龙斑岩铜矿床为例进行分析,提出了矿床定量评价的4个方面的新认识:(1)区域矿床发生、发展的年代与消亡速率的确定是研究矿床规模与保存环境的重要参数;(2)研究区的古地理、古气候特征有利于斑岩体的剥蚀起始时间的估算,研究区不同时代地层剖面的对比分析以及成矿古地理环境的模拟有利于正确评价斑岩矿床的形成与保存现状;(3)地层、岩体、构造和DEM数据的三维空间定量研究是正确评价"多位一体"成矿模式的重要因素;(4)3S技术发展了三维可视化技术、数据融合和模拟技术,能够最大限度地利用各种多元数据(地质、地球物理、地球化学和遥感等)资料,有助于提高发现大型矿床或潜在矿床的成功率。

NEW INSIGHTS OF QUANTITATIVE ASSESSMENT TO FOUR DIMEN-SIONAL SPACE-TIME OF DEPOSITS-A CASE STUDY OF PORPHYRY Cu DEPOSIT IN THE YULONG AREA OF TIBET

Mineral exploration has stridden forward a new era of application of comprehensive ore-forming information to systematically quantitative search for buried large and super-large ore deposits with help of sophisticated techniques. The sophisticated survey ,including 3S(GPS,GIS,RS)technology ,dating technology and information processing techniques supply new support for mineral exploration. Based on the multi-information of porphyry Cu deposit in the Yulong area of eastern Tibet, the forming and preservation of Cu deposit can be quantitatively evaluated through DEM (Digital Elevation Model)data processing and three dimensional simulation with 3S.The research result shows that ancient geography and ancient climate characters are favor to estimate the origination time of porphyry denudation; the denudation speed and the forming age of deposit are the important parameters to research deposit scale and conservation environment; the quantitative data of stratum,rock ,structure and DEM are the important factors to evaluate ore-forming pattern.