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藏东罗布莎蛇绿岩遥感岩矿信息提取方法研究

DOI: 10.6046/gtzyyg.2013.03.13, PP. 72-78

Keywords: 罗布莎,蛇绿岩,光谱角分类(SAM),波谱特征拟合(SFF)

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Abstract:

为研究如何利用遥感技术进行蛇绿岩岩矿信息识别和提取,以藏东罗布莎蛇绿岩为例,基于ETM和ASTER遥感数据,分别采用比值法和主成分分析法提取羟基类(蛇纹石、绿泥石)和铁染类(磁铁矿、橄榄石)矿物信息;利用纯净像元指数法(purepixelindex,PPI)提取端元波谱,结合地面已知岩性信息,分别采用光谱角分类法(spectralanglemapping,SAM)和波谱特征拟合法(spectralfeaturefitting,SFF)识别纯橄岩和橄榄岩,研究了罗布莎蛇绿岩及其主要蚀变矿物的空间分布特征。经过对比分析可知,用多种方法、多种数据提取的岩矿信息可以相互验证;提取出的纯橄岩和橄榄岩与所提取的羟基类和铁染类蚀变遥感异常信息有较好的空间重叠,且与地面调查结果基本吻合。研究表明,该方法用于蛇绿岩遥感岩矿信息提取是可行的,并取得较好的地质效果。

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