摘要
波伏棱型羟基纤蛇纹石是波伏棱型纤蛇纹石矿物的新变种,本文报导它的吸收光谱、红外光谱、穆斯堡尔谱、电子顺磁共振谱和核磁共振谱。 研究表明,吸收光谱是Fe^(3+)和Fe^(2+)的晶场跃迁以及Fe^(2+)→Fe^(3+)的荷移跃迁引起的;红外光谱是OH和Si-O的伸缩振动、OH转动以及Mg-O和Si-O的弯曲振动引起的;穆斯堡尔谱是Fe^(2+)_(八面体)、Fe^(3+)_(八面体)和Fe^(3+)_(四面体)引起的;电子顺磁共振谱是Mn^(2+)_(八面体)、Fe^(3+)_(八面体)和Fe^(3+)_(四面体)引起的;核磁共振谱是管道水,镁八面体和硅氧四面体上的OH引起的;矿物加热到825℃时,结构开始破坏并出现镁橄榄石相。 此外,本文还解释了该蛇纹石颜色的本质,阐明了上述过渡金属离子和OH在该矿物中的结构环境。
Povlen type hydroxyl-chrysotile is a new variety of Povlen type Chrysotile, whose absorption, infrared, Mssbauer, EPR and NMR spectra are reported in this paper.Experimentation shows that the absorption spectra are caused by crystal-field transitions of Fe^(3+) and Fe^(2+) ions and charge-transfer transition of Fe^(2+)→Fe^(3+), the infrared spectra by stretching vibrations of OH and Si-O, rotation of OH and bending vibrations of Mg-O and Si-O, the Mssbauer spectra by Fe_(octa)^(2+)., Fe_(octa)^(3+)., and Fe_(tetra)^(3+)., the EPR spectra by Mn_(octa)^(2+)., Fe_(octa)^(8+) and Fe_(tetra)^(8+)., and the NMR spectra by pipe water in fibre and OH on Mg-octahedra and Si-O tetrahedra. It is also demonstrated that, when heated to 825℃, the structure was destroyed and forsterite phase formed.In addition, this paper interprets the color of Povlen type hydroxyl-chryso-tile and describes structural environments of the above transitional metal ions and OH in this mineral.
出处
《岩石矿物学杂志》
CAS
CSCD
1989年第1期43-53,共11页
Acta Petrologica et Mineralogica
