The development of colour band is one of the main features of the sapphire in ba-salt in Changle,Shandong Province.The trace elements not only affect the colour of the gems,but also play an important role in understanding the genesis of sapphire and the moth-er source magma.This study takes the sapphires from Changle,Shandong Province as the research objects,and their spectrum characteristics and chemical compositions were tested by UV-visible absorption spectrometer,Fourier transformed infrared spectrometer and laser ab-lation inductively coupled plasma mass spectrometer(LA-ICP-MS).The results show that the sapphire samples from Changle have the characteristics of high Fe and Ga,low Mg and Cr,which is in line with the characteristics of sapphire in magma;the Fe content changes regularly with the shades of colour bands,indicating the intability of the sapphire crystalliza-tion process.The 3 310 cm 1 absorption peak related to-OH can be seen in the infrared absorption spectrum.The-OH content and the shade of the colour band are positively cor-related.The darker band has the highest-OH content,and the-OH content of light band is relatively low.In the ultraviolet spectrum,the yellow core part has obvious relationship with the 450 nm absorption peak related to Fe3+-Fe3+,indicating that the yellow core part is produced under partial oxidizing conditions.The blue colour zone has obvious relationship with the 450 nm absorption peak related to Fe2+-Ti4+,indicating that the blue colour zone is produced under partial reducting conditions.
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