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名义无水矿物(NAMs)中的结构水在地球内部演化中扮演了重要角色.应用红外光谱对产自5个构造背景下的13个二辉橄榄岩进行了详细的结构水测定,探讨不同构造背景下橄榄岩结构水的含量和赋存机制.研究显示,全岩和橄榄石结构水含量按构造背景从高到低排序,依次为超高压地体、地幔柱、稳定克拉通、俯冲带和活化克拉通,反映了橄榄岩的水含量与构造环境具有显著相关性.在相同构造背景下,石榴石二辉橄榄岩比尖晶石二辉橄榄岩含更多结构水,表明上地幔水分布可能具有分层性.超高压地体和稳定克拉通样品中橄榄石具有[Si]空位导致的吸收峰3611～3613cm-1,而缺乏由[Fe3+]引起的吸收峰3325cm-1和3355cm-1,表明地幔的还原性随深度增强.
Structural water in nominal anhydrous minerals (NAMs) plays an important role in the evolution of the Earth’s interior.Using infrared spectroscopy, 13 structures of lherzolites produced from five tectonic settings have been subjected to detailed structural water measurements to investigate the effects of different structures In the background, the content of peridotite structure water and its mechanism of occurrence are studied.The results show that the water content of the whole rock and olivine structure is ordered from high to low in terms of tectonic setting, followed by the UHP terrane, mantle plume, stable craton, subduction zone and Activated craton, reflecting the peridotite water content has a significant correlation with the tectonic setting.Under the same tectonic setting, garnet lherzolite contains more structural water than spinel lherzolites, indicating that the upper mantle water distribution may be stratified The olivine in the ultrahigh-pressure terrain and the stable carat sample has the peak of 3611 ~ 3613cm-1 due to [Si] vacancy and the lack of absorption peaks of 3325cm-1 and 3355cm-1 caused by [Fe3 +], indicating that the Reducing increases with depth.