新疆西准噶尔包古图斑岩铜矿蚀变岩石的光谱特征及其意义

地物的光谱特征是遥感识别地物的主要依据,不同地物的反射光谱具有其特定的吸收特征谱带。利用ASD和PIMA反射光谱测试仪对新疆西准噶尔包古图斑岩铜矿Ⅱ号、Ⅴ号斑岩铜矿岩体的蚀变围岩(地表采样与钻井采样)进行测试,并对结果进行分析总结。根据反射光谱特征谱带获得蚀变矿物的种类,确定了岩体的蚀变矿物组合,得到反射光谱的吸收谷在ASTER数据中所处的波段;对反射光谱曲线进行数学积分,获得ASTER数据中的强吸收波段。将以上2种分析得到的吸收性波段组合应用于蚀变遥感异常信息提取,结果表明蚀变遥感异常与野外地质特征吻合程度较高。反射光谱分析表明确定岩石矿物的反射光谱特征谱带是进行遥感信息提取工作的前提,波段组合选取对提取蚀变遥感异常信息非常重要。

Spectral Characteristics and Its Significance of Altered Rocks of Baogutu Porphyry Copper Deposit in Western Junggar, Xinjiang

Spectral characteristics of ground objects are the main information for target recognition by remote sensing.Being different special reflection spectra in each object,reflection spectra provide lots of important information for remote sensing information extraction.In this paper,the reflection spectra of altered rocks from intrusions(No.2 and No.5)in Baogutu porphyry copper deposit have been tested by ASD and PIMA.The mineral recognition of samples from surface and drills has been detailedly studied.Altered mineral assemblages and the special bands of absorptive vale of reflectance spectra have been obtained from ASTER data.Mathematic integral method has been carried on the reflectance spectra and obtained the strong absorptive bands from ASTER data.Based on analyzing reflectance spectra and the mathematic integral,absorptive band assemblages give lots of information for extracting alteration remote sensing anomalies.The results show that alteration remote sensing anomalies and the geological feature have a good comparability.Ascertaining spectral characteristics of altered minerals is the principle and basis for remote sensing information extraction.