塔河地区主要岩石金属元素含量、物性参数与光谱特征间的关系研究

测试了采集自黑龙江省塔河地区的300块并进行抛光处理后的岩石样本350~2 500nm间光谱反射率、磁化率、密度、孔隙率和金属元素含量(Fe,Mn,Ti,Zr,V,Zn,Pb,Nb,Co,Bi),并计算了其光谱吸收深度。在此基础上,以相关性分析方法为依据,探讨了所采集岩石样本的金属元素含量、物性参数、反射光谱间的特征响应关系,计算了岩石样本金属元素和光谱吸收深度间的相关性系数、物性参数与光谱反射率的相关性系数,获得成果如下:(1)在410nm附近,闪长玢岩各金属元素与吸收深度间的相关系数都存在尖锐的波峰和波谷,相关系数达到极值。(2)岩石样本金属元素和吸收深度的相关性研究中,侵入岩的相关系数则显著高于其他岩石类型。(3)1 400nm附近,岩石样本金属元素与吸收深度、各物性参数与光谱反射率的相关性都存在尖锐的波峰和波谷。其中磁化率、密度、视孔隙率与光谱反射率的相关系数在可见光范围内波动变化较大。(4)在1 900~2 500nm范围内,金属元素与光谱吸收深度、各物性参数与光谱反射率间的相关系数波动较大,其中金属元素和光谱吸收深度呈显著相关,相关系数达到极值。进一步研究了岩石金属元素和物理特性与其光谱特征的关系,对于不同岩性的不同波段的反射率与不同金属元素间分布状态的探测,具有一定意义。

Research on the Relationship between Main Rock Metal Elements Content,Physical Parameters and Spectral Features in Tahe Area

300 rock samples from Tahe area of Heilongjiang province were tested in terms of 350～2 500 nm spectral reflectance,susceptibility,density,porosity and content of metal elements(Fe,Mn,Ti,Zr,V,Zn,Pb,Nb,Co,Bi)with the calculation of the absorption depth.With this basis,the correlation analysis based on the method,an investigation was conducted to the characteristic response relationship between the metal element content of collected rock samples,physical parameters and spectral reflectance;besides,the correlation coefficient between metal elements and spectral absorption depth of rock samples as well as the correlation coefficient between physical parameters and spectral reflectance were calculated.The results were found as follows:(1)In the vicinity of 410 nm,the diorite porphyrite correlation coefficient of metal element and absorption depth exists the sharp peaks and troughs,and reaches extreme value.(2)Among the correlation of the metal element and the absorption depth,intrusive rocks correlation is significantly higher than that of other rock types.(3)Near 1 400 nm,the metal element and the absorption depth,and various physical properties of the spectral reflectance correlation exists sharp peaks and troughs.Wherein the correlation between the susceptibility,density,porosity and the spectral reflectance in the visible range fluctuates greatly.(4)In the range of 1 900～2 500 nm,the correlation coefficient between the metal element and the spectrum absorption depth,the physical parameters and the spectral reflectance fluctuate greatly,in which the metal elements and the spectral absorption depth were significantly correlated,and the correlation coefficient reached the extreme value.In this paper,the relationship between physical properties and the spectral characteristics of the metal element is further studied,which is of great significance in detecting reflectance of different lithology and different bands and distribution of different metal elements.