本文介绍了名义上无水的辉石族矿物中结构水的研究现状,特别是硬玉矿物的结构水红外表征和含量.且笔者以缅甸硬玉岩为研究对象,使用显微红外光谱、电子探针等测试手段,从微观角度研究其中硬玉矿物的结构水表征.研究结果表明:缅甸硬玉岩中硬玉矿物的结构水在红外光谱中主要表征为3 610~3 620 cm-1和3 540~3 550cr-1两个区域的吸收峰,且结构疏松的硬玉岩中硬玉矿物的结构水含量呈现外侧多中间少,结构致密的硬玉矿物的结构水含量各部位较为均一.结构水的含量差异和变化趋势可能是硬玉岩形成时板块俯冲和折返过程中的流体参与作用的结果,进一步为缅甸硬玉岩成因提供了的佐证.
This paper describes the research status of constitutional water in nominally anhydrous pyroxene group minerals, especially the FTIR characterization and content of constitutional water of jadeite in different rocks. The jadeite minerals from Myanmar were investigated lay using micro-FTIR and electron microprobe analysis (EPMA), and the constitutional water characterization of jadeite minerals from Myanmar was studied microcos- mically. According to the results achieved, the constitutional water of jadeite minerals from Myanmar is charac- terized by spectral peaks in the range of 3 610~3 620 cm^-1 and 3 540~3 550 cm^-1 on the infrared spectra, the content of constitutional water of jadeite minerals in loose structure jade is higher on the outer side and less in the middle, and the constitutional water content in various parts of jadeite minerals with compact structure is fairly homogeneous. Content difference and change trend of constitutional water are not affected by its chemical com- position, and probably result from such factors as fluid involvement in diagenesis, jade forming stage and plate subduction and exhumation process. The results achieved by the authors provide a certain basis for the genetic study of Myanmese jade.