基于ASTER数据的蛇绿岩组分识别：以德尔尼矿区为例

本文运用高级星载热辐射和反射探测器（ASTER）反射率数据对青海德尔尼蛇绿岩的主要岩石组成和蚀变矿物进行探测.以现有的标准光谱库数据作为参照,采用光谱角制图法来提取感兴趣的岩性和矿物信息,并通过与现有地质图对比,验证结果的精度.实验结果表明,运用ASTER数据和标准的光谱库数据,可较有效地识别蛇绿岩的主要岩性和相关矿物成分,但不同岩性的识别精度不同.

Ophiolite mapping using ASTER data:a case study of Derni ophiolite complex

The ASTER(Advanced Spaceborne Thermal Emission and Reflectance Radiometer)reflectance data were evaluated in the mapping of main rocks and related altered mineral of the ophiolite complex in Derni area,Qinghai Province.The Spectral Angle Mapper was used for detection of the rock types and related minerals,taking the spectral curves from existing spectral library as the reference spectra.The mapping results were evaluated by the comparison with the geological maps.The results showed that the use of ASTER reflectance data and the spectra from the spectral library can effectively detect the main rocks and related minerals of the ophiolite complex.However,the different rocks have the different mapping accuracies,which is dependent on the spectral features that the rocks and minerals have.