汉诺坝幔源单斜辉石巨晶中的结构水:红外光谱观察  

STRUCTURAL WATER IN MANTLE-DERIVED CLINOPYROXENE MEGACRYSTS FROM HANNUOBA: FTIR INVESTIGATIONS

作　　者：夏群科[1] 陈道公[1] 郭立鹤 支霞臣[1] 

机构地区：[1]中国科学技术大学地球及空间科学系,合肥230026 [2]地质科学院矿床地质研究所,北京100037

出　　处：《矿物学报》1999年第2期161-165,共5页Acta Mineralogica Sinica

基　　金：国家自然科学基金(!49803002;49773181)

摘　　要：本文利用傅立叶变换红外光谱技术对产自河北汉诺坝新生代玄武岩中的4个单斜辉石巨晶进行了微量结构水的观察．确定3SOOcm‘左右和3620cm－‘左右两组峰为结构OH吸收峰，其中3500cm(-1)‘左右是主要特征吸收峰。单斜辉石巨晶自源区被携带至地表的过程中未经历明显的红扩散丢失。结合文献中的资料可以认为，上地幔中水的分布可能是不均一的。Four clinopyroxene megacrysts from Hannuoba Cenozoic basalts have been investigated by Fourier transform infrared spectrometer(FTIR ). The results demonstrate that at about 3 500 cm-1 and about 3 620 cm- 1 appear absorption bands of structural OH, in which the major charactetistic one is at about 3 500 cm-1. Clinopyroxene megacrysts have not undergone diffusion loss of hydrogen to a large extent. The available data suggest that water is heterogene0usly distributed in the upper mantle.

关 键 词：结构水 单斜辉石 汉诺坝 红外光谱 矿物晶体 

分 类 号：P578.954[天文地球—矿物学] P573[天文地球—地质学]