南黄海陆架中部沉积物反射率光谱的影响因素分析

利用Minolta CM-2002光谱光度计对南黄海陆架136个短柱样品20~25cm段的沉积物进行了颜色反射率数据测量,通过化学元素、粒度、磁化率等来确定影响沉积物颜色反射率变化的成分和因素,介绍了反射率光谱的一阶导数和因子分析的方法。分析结果表明,南黄海陆架沉积物颜色反射率受控于沉积物中的铁氧化物、有机质以及粘土矿物和钙质生物碎屑含量。主因子F1指示氧化环境,并与陆源物质相关,F2指示弱氧化环境,F3指示弱还原环境,主因子的波长范围分别是405~445 nm和495~595 nm,605~695 nm,445~485 nm。

Analysis of Affecting Factors for Reflectance Spectra of Sediments From the Central Shelf Area of the Southern Yellow Sea

Minolta CM-2002 spectrophotometer was used to measure the color reflectances of 136 sediment cores from the southern Yellow Sea shelf area,the compositions and factors affecting the variations in sediment color reflectance were determined by meas of chemical elements,grain size and magnetic susceptibility of sediments,and the first derivatives of reflectance spectra and the factor analysis method are introduced.It is shown from the analysis results that the color reflectance of sediments from the southern Yellow Sea shelf area is controlled by the ferric oxide,organic matter,clay mineral and calcareous biogenic detritus contents in sediments.Factor F1 indicates the oxidation environment and is correlated with the terrigenous material,factor F2 indicates the weak oxidation environment,and factor F3 indicates the weak reduction environment.The wavelength ranges of principal factors F1,F2 and F3 are 405 to 445 nm and 495 to 595 nm,605 to 695 nm and 445 to 485 nm,respectively.