黑龙江穆棱地区巨晶斜方辉石矿物学及光谱学特征

系统分析了黑龙江穆棱地区巨晶斜方辉石的性质、化学成分和光谱学特征。电子探针(EMPA)的分析结果表明,该巨晶斜方辉石属于斜顽辉石,其元素组成包括Ca,Na,Mg,Fe,Al,Ti,Si和O,结构水含量为20～130ppm。拉曼光谱(Raman)的特征峰位于1 015,678和345cm^-1,分别由不同的振动类型引起。傅里叶红外光谱(FTIR)的分析表明巨晶斜方辉石在官能团区具有三个明显的吸收峰,它们分别位于3 550～3 590,3 510～3 520和3 410～3 420cm^-1,与幔源辉石结构水的吸收峰较为一致;对巨晶斜方辉石的红外微区含水量测试分析表明,结构水在不同巨晶斜方辉石间存在差异,但在单一辉石样品内部分布均匀,无明显核-边变化。

Spectroscopy Analysis on Orthopyroxene Megacrysts in Heilongjiang Muling Area

In this paper, we analyzed the mineral properties, element composition and spectroscopy characteristics of orthopyroxene megacrysts in Heilongjiang Muling area via EPMA, Raman and FTIR analysis. The species, element composition and constitution water content of orthopyroxene megacrysts were determined. According to the EPMA results, we found that the orthopyroxene megacrysts in this area belong to orthopyroxene. The Raman spectra showed that the main bands of orthopyroxene megacrysts are 1 015, 678, 345 and 145 cm-1. The FTIR results showed that orthopyroxene megacrysts have three distinct peaks at 3 550～3 590, 3 510～3 520 and 3 410～3 420 cm-1. These absorption peaks are consistent with mantle derived pyroxene. The FTIR micro-region analysis showed that the constitution water is distributed unevenly in different orthopyroxene megacrysts but uniformly in the inner part one orthopyroxene megacryst, and there is no obvious change in the core-edge.