桂林理工大学学报2023，Vol.43Issue(4)：559-569,11.DOI:10.3969/j.issn.1674-9057.2023.04.003
拉曼光谱在划分普通球粒陨石化学群及冲击变质程度中的应用
Application of Raman spectroscopy to classification of chemical groups and impact metamorphism of ordinary chondrites
摘要
Abstract
The chemical group and impact metamorphism degree of balanced ordinary chondrites are important indicators to judge the characteristics of the parent body of meteorites,which are often determined according to the mineral association,composition and structural characteristics.Laser Raman spectroscopy,as a nondestruc-tive and rapid analysis technique,is widely used in semi-quantitative analysis of mineral composition and crystal structure determination.Northwest Africa(NWA)15006 is an ordinary chondrite with homogeneous composition of olivine(avg.Fa25.4,PMD=2.9)and pyroxene(avg.Fs21.4,PMD=4.5)and is classified as L4.Based on the petrological and mineralogical study of NWA 15006,this paper analyzes olivine,pyroxene,plagioclase and phosphate minerals by Raman spectroscopy,the corresponding relationship between characteristic Raman peak positions(XA and XB)and composition(Fa and Fs)of olivine and pyroxene was obtained.The XA of olivine in the H,L and LL chondrites are 821.4-822.1 cm-1,820.4-821.0 cm-1 and 819.4-820.4 cm-1,respectively.The XB of pyroxene is 680.3-681.5 cm-1,679.0-680.0 cm-1 and 677.8-679.0 cm-1,respectively.By using corresponding characteristic peaks,NWA 15006 can be accurately and quickly classified into L group.The characteristic Raman peaks are 508.7 and 476.7 cm-1 for plagioclase,956.9 and 972.6 cm-1 for merrillite,and 958.9 cm-1 for apatite.Combined with the relationship between mineral Raman spectral peaks and pressure changes,all three of them are weakly impacted,with the impact pressure<6.8 GPa.It is consistent with the impact degree S2 judged by petrological characteristics.The above analysis shows that it is feasible to classify the chemical group and impact metamorphism degree of ordinary chondrites by Raman spectra of typical miner-als,which provides a new means for the classification of meteorites.关键词
普通球粒陨石/拉曼光谱/化学群/冲击变质/NWA 15006Key words
ordinary chondrites/Raman spectroscopy/chemical group/impact metamorphism/NWA 15006分类
天文学引用本文复制引用
陈燕,夏志鹏,张亦恺,林书宇,陈洪,张兆峰,潘瑜..拉曼光谱在划分普通球粒陨石化学群及冲击变质程度中的应用[J].桂林理工大学学报,2023,43(4):559-569,11.基金项目
中国科学院先导专项B类项目(XDB41000000) （XDB41000000）
国家自然科学基金项目(42203048 （）
41776196) （）
广西自然科学基金项目(2022GXNSFAA035567 （）
2021GXNSFBA075061) （）
