新疆软玉仔料中黑色树枝状物质的拉曼光谱和显微结构特征

发布时间：2018-06-12 16:14

本文选题：软玉仔料 + 树枝状物质　；参考：《光谱学与光谱分析》2017年02期

【摘要】：软玉仔料表层微裂隙处常见一种黑色树枝状物质,该物质极大程度地揭示了仔料历经的次生风化过程,然而目前对其岩石矿物学特征研究甚少。选取新疆软玉仔料为研究对象,采用电子探针、激光拉曼光谱仪和扫描电子显微镜就其表层微裂隙处黑色树枝状物质的化学成分、拉曼光谱和显微结构进行测试分析。结果表明:黑色树枝状物质的主要化学成分为MnO和BaO,MnO含量为49.045%~54.012%,BaO含量为9.012%~10.961%。拉曼光谱分析显示软玉仔料主体部分主要由透闪石矿物组成,而黑色树枝状物质则主要由表生锰矿物和有机质组成。表生锰矿物中由MnO_6八面体Mn—O伸缩振动所致拉曼特征谱峰位于475,498,510,575和617cm~(-1)附近;且树枝各处锰矿物结晶程度不一,表现为拉曼谱峰强度和峰形尖锐程度存在区别。有机质由分子结构中C—C伸缩振动和分子结构单元间缺陷、无序排列所致拉曼特征谱峰分别位于1 590和1 370cm~(-1)附近。扫描电子显微镜观察显示黑色树枝状物质呈薄膜状覆盖于交织排列的透闪石纤维表面,并与其突变接触。综合化学成分、拉曼光谱和显微结构测试分析,软玉仔料中黑色树枝状物质的形成与河流中锰化合物和有机质的多期次沉降有关。
[Abstract]:There is a kind of black dendritic material in the micro-fracture of the surface layer of nephrite, which reveals the process of secondary weathering to a great extent. However, there is little research on the characteristics of rock mineralogy. The chemical composition, Raman spectrum and microstructure of black dendritic material in the micro-fracture of Xinjiang nephrite were studied by electron probe, laser Raman spectrometer and scanning electron microscope. The results show that the main chemical constituents of the black dendritic substance are MNO and BaO- MNO, the contents of which are 49.045 and 54.012, respectively. The content of Bao is 9.01212 and 10.961. Raman spectrum analysis showed that the main part of nephrite was mainly composed of tremolite minerals, while the black dendritic material was mainly composed of epigenetic manganese minerals and organic matter. The Raman characteristic peaks caused by Mn-O stretching vibration of Mn-O are located near 475498510575 and 617cm ~ (-1), and the degree of crystallization of manganese minerals in various branches is different, which shows that the intensity of Raman spectra and the sharp degree of peak shape are different. The Raman characteristic spectra of organic matter are located near 1 590 and 1 370 cm ~ (-1), respectively, due to C-C stretching vibration in molecular structure and defects among molecular structural units, and the Raman characteristic spectra due to disordered arrangement are located in the vicinity of 1 590 and 1 370 cm ~ (-1), respectively. Scanning electron microscopy (SEM) showed that the black dendritic material covered the interlaced tremolite fiber surface in a thin film and was in contact with its abrupt changes. According to the chemical composition, Raman spectroscopy and microstructure analysis, the formation of black dendritic substances in nephrite litter is related to the multi-stage deposition of manganese compounds and organic matter in rivers.
【作者单位】：国家珠宝玉石质量监督检验中心上海实验室;同济大学海洋与地球科学学院;同济大学宝石及工艺材料实验室;
【基金】：国家自然科学基金项目(41272049,41140023)资助
【分类号】：P619.28;O657.37

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