以硬玉岩中名义上无水硬玉矿物为研究对象, 通过常温和变温红外光谱测量, 确定硬玉矿物结构水表征及变温过程热变异行为。 研究结果显示: 由M—OH伸缩振动所致的红外吸收谱带集中于3 700～3 600, 3 570～3 520, 3 500～3 300及3 230～3 140 cm-1波数范围内, 但在不同的硬玉岩中具有不同的红外吸收。 变温过程中, 该吸收谱带基本在500 ℃左右相对吸收强度出现较为明显的减弱, 且结构水含量也逐渐下降, 进一步表征硬玉矿物中的“水”是以结构水的形式进入晶格。 但此M—OH伸缩振动所致的吸收谱带、 结构水含量和指纹谱均在850 ℃附近出现较为明显的变化, 预示该温度硬玉矿物的成分已出现变异。 硬玉矿物中“水”的热变异行为为进一步了解水分子的赋存状态与结合方式及其成岩机制提供一定的佐证。

Take the nominally anhydrous jadeite mineral in jadeitite as research objects, useing FTIR with normal temperature and heterotherm, to analyse representation of structure water and thermal variation behavior of jadeite. The result shows: Representation of FTIR of M—OH stretching vibration concentrates mainly on four areas, 3 700～3 600, 3 570～3 520, 3 500～3 300 and 3 230～3 140 cm-1, but with different characterization in different jadeite. In the process of varying temperature, the relative absorption intensity of absorption band in 500 ℃ decreased obviously, and the content of structure water gradually decreased, further characterization of the “water” in jadeite minerals is in the form of structure water. But the absorption spectrum caused by M—OH stretching vibration, the content of structure water and fingerprint spectra near 850 ℃ changesobviously, indicating that the temperature of jadeite mineral composition has mutated. The thermal variation behavior of “water” in jadeite mineral provides some evidence in order to further understand the occurrence state and binding mode of water and diagenetic mechanism.