桂林理工大学学报2017，Vol.37Issue(4)：553-560,8.DOI:10.3969/j.issn.1674-9057.2017.04.001
川南滇北玄武岩晶洞中葡萄石的矿物学特征及颜色成因
Mineralogical characteristics and colouration mechanism of prehnite in basaltic druse from southern Sichuan and northern Yunnan
摘要
Abstract
Mineralogical characteristics and coloration mechanism of prehnite in basaltic druse from southern sichuan and northern Yunnan are investgated by optical microscopy,X-ray power analysis,scanning electron microscopy,electron probe microanalysis,ultraviolet-visible-near infrared spectrophotometer,etc.Prehnite in basaltic druse from Puge County shows bluish yellow green and light yellow green in two different colors.The morphology of single crystals is mainly plate-like,pinacoid c {001 } and orthorhombic prism m{110} is developed,and pinacoid a{ 100} is not obvious.The aggregates of prehnite are scallop shape and grape-like shape.The components of prehnite are A12 O3,SiO2,CaO,FeO,Fe2 O3,with a small amount of Cr2 O3.Color of Zhaotong prehnite is light blue green,yellow green,and bright yellow green,single crystals is mainly columnar crystal.The common forms are orthorhombic prism m { 110 },pinacoid a { 100 } and c { 001 }.Pinacoid c { 001 } are shown in the largest area,followed by the pinacoid a { 100 },while orthorhombic prism m { 110 } in prehnite crystal are shown in the smaller area.The aggregates of Zhaotong prehnite are mainly of lantern-shaped,and there is no Cr2O3 in the chemical composition of Zhaotong prehnite.This study shows the color of prehnite mainly caused by the crystal field splitting of the colored ions,such as Fe2+,Fe3+,Cr3+,and so on.The hole formed by the substitution of the isomorphism between different valence cations outside the silicon oxygen skeleton has some influence on the color of the prehnite.The deepening of prehnite color is directly proportional to the content of iron (or iron and chromium),and there is an increase of amount of chromium which decreased prehnite crystal transparency.关键词
葡萄石/晶体形貌/致色离子/空穴致色/四川普格/云南昭通Key words
prehnite/crystal morphology/coloring ion/coloring hole center/Puge in Sichuan/Zhaotong in Yunnan分类
天文与地球科学引用本文复制引用
阮青锋,邱志惠,宋林,刘俊伯,童静芳,李夏云..川南滇北玄武岩晶洞中葡萄石的矿物学特征及颜色成因[J].桂林理工大学学报,2017,37(4):553-560,8.基金项目
国家自然科学基金项目(41362004) （41362004）
