硼镁石拉曼光谱的初步研究  

Preliminary Raman Spectroscopic Study of Szaibélyite

作　　者：隋欣浩 赵旭炜 暴新建 何明跃[3] 刘曦[1,2] SUI Xin-hao;ZHAO Xu-wei;BAO Xin-jian;HE Ming-yue;LIU Xi(Key Laboratory of Orogenic Belts and Crustal Evolution,Ministry of Education,Beijing 100871,China;School of Earth and Space Sciences,Peking University,Beijing 100871,China;School of Gemmology,China University of Geosciences(Beijing),Beijing 100083,China)

机构地区：[1]北京大学造山带与地壳演化教育部重点实验室,北京100871 [2]北京大学地球与空间科学学院,北京100871 [3]中国地质大学(北京)珠宝学院,北京100083

出　　处：《光谱学与光谱分析》2025年第4期1096-1102,共7页Spectroscopy and Spectral Analysis

基　　金：国家岩矿化石标本资源库(NCSTI-RMF20240218);中国科学院战略性先导科技专项(B类)项目(XDB42000000)资助。

摘　　要：硼镁石是一种含水的硼酸盐矿物,其拉曼光谱报道目前还十分有限。对来自中国吉林省集安县的蛇纹石化集安岩中的硼镁石进行了拉曼光谱研究。显微观察显示该硼镁石与蛇纹石族矿物、镁橄榄石、水镁石等矿物一起产出,或以直径达几十微米的纤维状/细板状晶体出现,或以纳米级晶体形式与少量纳米级水镁石形成集合体。EDS分析显示其成分接近理想分子式MgBO_(2)(OH)。与前人的报道结果相似,该研究在100~1600 cm1范围内观察到了约28个拉曼峰,其中~832 cm^(-1)拉曼峰最强。在3000~4000 cm^(-1)的范围内,本研究观察到~3058及3553 cm^(-1)两个尖锐强峰和~3562 cm^(-1)弱肩峰,其中~3058 cm^(-1)拉曼峰为首次观察到,它们应都由O—H伸缩振动引起。结合前人文献中的单晶XRD数据及红外光谱数据,研究推测~3058及3553 cm^(-1)处的强拉曼峰可能分别与硼镁石中的羟基O(4)—H和O(6)—H有关。~3562 cm^(-1)处的弱肩峰起源还不明确,需要进一步的研究。Szaibélyite is a hydrated borate mineral with limited research on its Raman spectrum.This study conducted a preliminary Raman spectroscopic analysis of szaibélyite,with the Raman data collected on szaibélyite found in some serpentinized jianite from Ji an County,Jilin Province,China.Our microscopic observations show that the szaibélyite is associated with serpentine-group minerals,forsterite,brucite,etc.It occurs as fibrous or fine flattened crystals with diameters of up to several tens of micrometers or nanocrystals forming aggregates with minor amounts of nano brucite.Energy dispersive spectroscopy analyses suggest its composition is close to the ideal MgBO_(2)(OH)formula.In the range of 100~1600 cm^(-1),approximately 28 Raman peaks have been observed,with the strongest peak appearing at~823 cm^(-1).In the range of 3000~4000 cm^(-1),two sharp strong peaks at~3058 and 3553 cm^(-1) and a weak shoulder peak at~3562 cm^(-1) have been observed.Among them,the Raman peak at~3058 cm^(-1) is observed for the first time.These peaks are mostly related to the O—H stretching vibrations.Aided with previous single-crystal X-ray diffraction data and infrared spectroscopic data,we propose that the strong Raman peaks at~3058 and 3553 cm^(-1) may be caused respectively by the hydroxyl groups O(4)—H and O(6)—Hin szaibélyite.The origin of the weak shoulder peak at~3562 cm^(-1) is still unclear and requires further investigation.

关 键 词：硼镁石 拉曼光谱 晶体结构 羟基 

分 类 号：P574.11[天文地球—矿物学]