探索岩石光谱与岩石其他物性之间的联系具有重要意义。 运用SVC HR-768便携式光谱仪对相山铀矿田内的36块5 cm×5 cm×5 cm大小的碎斑熔岩样品进行光谱测量, 每测量一个样品之前测量一次白板进行校正, 对测量后的光谱曲线进行5 nm的平滑重采样消除由大气水及其他外界环境变化所引起的噪声。 截取平滑重采样后1 112～1 322 nm范围的岩石光谱, 以波段值为横轴(X轴), 反射率为纵轴(Y轴)进行线性方程拟合, 求得各岩石样品在该光谱范围的直线方程。 以直线方程的斜率为横轴(X轴), 样品的体积磁化率为纵轴(Y轴)进行方程拟合, 得到y=－0.256 3 ln(x)+0.913 7, 相关系数高达0.78。 结果表明, 该岩石的体积磁化率主要由含Fe2+矿物引起; 1 112～1 322 nm范围光谱斜率能够半定量测定岩石中的Fe2+含量; 该范围的岩石光谱与体积磁化率具有较好的相关性。

Rock spectrum research is the base of the remote sensing geology. It’s of great significance of exploring the relations between rock spectrum and other rock natures. In the present study, 36 fine crushed lava samples each measuring 5 cm×5 cm×5 cm were tested for its spectrums by SVC HR-768 portable spectrometer. But before measuring each sample, white boards should be calibrated and after measuring the curves of spectrum of each sample should make a 5 nm smooth resample so that meteoric water and noise caused by external environment can be eliminated. After such smooth resample, at the spectrum scope of 1 112~1 322 nm, taking band value as horizontal axis and reflectivity as vertical axis, linear equations of rock samples can be obtained. Taking the slopes as the horizontal axis and volume magnetic susceptibility as vertical axis, y=-0.256 3ln(x)+0.913 7 was thus obtained and its equation correlation coefficient is up to 0.78. The result shows that volume magnetic susceptibility is mainly caused by Fe2+, and that the amount of Fe2+ can be almost measured in the spectrum scope of 1 112~1 322 nm that has a good correlation with volume magnetic susceptibility.