山东蒙阴金伯利岩中的橄榄石样品的OH红外光谱研究结果表明, 在橄榄石的红外光谱图中, 3 800～3 000 cm-1范围内共有60多个νOH吸收峰。 其中3 800～3 710 cm-1范围内的νOH吸收峰主要是由空气中的水蒸气所引起的, 并非橄榄石的本质或非本质νOH; 3 710～3 620 cm-1范围内的νOH吸收峰主要归属于蛇纹石、 滑石、 含镁闪石三种含水蚀变矿物相, 是橄榄石的非本质νOH。 含水矿物相中的H主要是在金伯利岩浆后期侵位期间进入橄榄石的; 3 620～3 425 cm-1范围内的νOH吸收峰源于H占据橄榄石结构中的Si空位后形成的硅镁石型缺陷, 及(或)H占据橄榄石结构中的(Mg, Fe)等阳离子空位后形成的缺陷, 因而是橄榄石的本质νOH。 H主要是在地幔环境中, 当橄榄石存在于高温的、 富流体的金伯利岩浆中时进入橄榄石的; 3 425～3 000 cm-1范围内的νOH吸收峰主要是由流体水分子所引起的, 是橄榄石的非本质νOH。 流体水可以在地幔环境中, 也可以在金伯利岩浆后期侵位期间进入橄榄石。

The results of FTIR spectra study of OH in olivines from Mengyin kimberlite show that there are more than 60 OH absorption peaks in the range of 3 800～3 000 cm-1. We identified four major spectral features in the OH absorption bands of kimberlitic olivines. One is with νOH in the range of 3 800～3 700 cm-1, which is caused by the vapour of the room circumstance, and can not be regarded as intrinsic or non-intrinsic νOH of the olivines. Another one is with νOH in the range of 3 710～3 620 cm-1, which belongs to three “water”-bearing minerals including serpentine, talc and Mg-bearing amphiboles, which is the non-intrinsic νOH of the olivines. There is the possibility that H in hydrous minerals mainly entered into olivines during post-emplacement processes of the kimberlite magma. The third one is with νOH in the range of 3 620～3 425 cm-1, which originated from H occupying the Si-defect in the olivine structure, forming humite-like defects, and/or the defects that H occupies (Mg,Fe)-depletion, which is certainly attributed to the intrinsic νOH of the olivines. In this case, H possibly entered into olivines following its immersion in the high temperature and rich fluid kimberlite magma in the mantle circumstance. The last one is with νOH in the range of 3 425～3 000 cm-1. In this area, νOH is assigned to fluid inclusions of the olivines, and is the non-intrinsic νOH of olivines. Fluid inclusions can enter into the olivines either during post-emplacement processes of the kimberlite magma or during the periods that olivines were formed in the mantle.