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基于ETM+6-γ示矿信息反演的花山花岗岩铀矿预测

DOI: 10.6046/gtzyyg.2014.03.15, PP. 92-98

Keywords: ETM+6,γ能谱,热红外遥感,花岗岩,铀矿,预测

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Abstract:

构成铀矿的主要元素——235U核素因衰变释放成因热,使得花岗岩侵入成因的铀矿床(体)周围具有热红外遥感异常。广西桂东花山花岗岩体具有较好的铀矿成矿地质条件,但该区地形复杂,交通不便,利用传统方法开展矿产勘查工作困难很大。为快速圈定该区成矿有利部位,采用Landsat7ETM+6热红外波段数据,通过数字图像处理技术提取岩体遥感热异常,建立了ETM+6-γ能谱异常场反演模型;运用该模型反演得到了桂东花山花岗岩体的γ能谱异常场分布;在此基础上,根据断裂构造控矿条件及相关地质、矿产资料对γ能谱异常进行筛选,最后在花山花岗岩中圈定出一批铀矿找矿预测区。不仅为下一步实地铀矿勘查找矿工作提供了重要线索,而且再次证明了热红外遥感反演的地温异常信息在花岗岩型铀矿预测中的巨大潜力。

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