Development of Near Infrared Microspectroscopy and its Application to Spectroscopic Study on Opaque Minerals.

近红外显微光谱学的发展及其在不透明矿物光谱研究中的应用。

• 批准号: 07554081
• 负责人: SUZUKI Katsuhiko
• 金额: $ 0.77万
• 依托单位: The University of Tokyo (1996)University of Tsukuba (1995)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07554081/
• 关键词: Opaque Minerals; Near Infrared Microscopy; Molybdenite; Rhenium-Osmium Age; FTIR; Water; Hydrogen Bonding; 近赤外; 顕微鏡; 鉱物; 赤外スペクトル

1. We developed a spectroscopic equipment which enables us to obtain in-situ near infrared (NIR) spectra from a small region of praque minerals imaged with an NIR optical microscope. NIR output light was intyroduced to an emission port of FTIR spectrometer (Perkin Elmer Spectrum 2000) using aluminum mirrors. The present system can show the availability of this optical arrangement, but further improvement will intensively increase in the sensitivity.2. Relationship between molybdenite alteration, and its NIR spectrum and Re-Os age was investigated. Molybdenite was altered at 180 ﾟC for 20 days in various solutions, such as CaCl_2, AlCl_3, NaCl, NaHCO_3 and H_2O.In the latter three cases, little changes could be found in NIR transparency. IN molybdenites altered in CaCl_2 and AlCl_3, on the contrary, increase in transparency of NIR in some parts of molybdenites was observed. In these two cases, it was also found that the absorption edges observed in ca. 3250 cm^<-1> were moved to the boundary region between visible and IR, which indicates increase in band gap of molybdenite. Incidentally, it was found that fractionation in Re-Os system is not necessarily associated with its NIR transparency.3. The OH stretching + HOH bending combination mode of molecular water was found to be a promising indication for the chemical state of molecular water in natural samples. In natural samples, it is fairly difficult to distinguish between OH ion and molecular water only from OH stretching band. The combination band observed in NIR region is exclusively from molecular water. We observed the combination band of water in cubic diamonds, and the temperature dependence of band shape demonstrated the presence of high pressure phase of ice in one of the samples.

1。我们开发了一种光谱设备，使我们能够从带有NIR光学显微镜成像的较小的Praque矿物区域获得附近的现场（NIR）光谱。使用铝制镜子，将NIR输出光直接调节到FTIR光谱仪的发射端口（Perkin Elmer Spectrum 2000）。本系统可以显示这种光学布置的可用性，但是进一步的改进将大幅提高灵敏度2。研究了钼酸盐改变及其NIR光谱与重新群体年龄之间的关系。在各种溶液中，在180°C下改变了20天，例如CACL_2，ALCL_3，NACL，NAHCO_3和H_2O.IN后三种情况，在NIR透明度中几乎没有变化。在对比度中，在CACL_2和ALCL_3中改变的钼矿中，观察到了在钼酸群的某些地区的透明度的增加。在这两种情况下，还发现在CA中观察到的抽象边缘。 3250 cm^<-1>移动到可见和IR之间的边界区域，这表明钼酸群的带隙增加。顺便说一句，发现Re-OS系统中的分馏不一定与其NIR透明度相关。3。发现分子水的OH拉伸 + HOH弯曲组合模式是天然样品中分子水的化学状态的有希望的指示。在天然样品中，仅将OH离子和分子水与OH拉伸带区分开是很难的。在NIR区域观察到的组合带仅来自分子水。我们观察到了立方钻石中水的组合带，带状的温度依赖性证明了其中一个样品中冰的高压相。

项目成果

Katsuhiko Suzuki: "Re-Os dating of molybdenites from ore deposits in Japan:Implication for the closure temperature of the Re-Os system for molybdenite and the cooling history of molybdenum ore deposits." Geochimica et Cosmochimica Acta. 60. 3151-3159 (199

Katsuhiko Suzuki：“日本矿床辉钼矿 Re-Os 定年：对辉钼矿 Re-Os 系统闭合温度和钼矿床冷却历史的影响。”

Agata, T: "Ilvaite from a serpentinized peridotite in the Asama igneous complex, Mikabu greenstone belt, Sambagawa metamorphic terrain, central Japan" Mineral.Mag.59. 489-496 (1996)

Agata, T：“来自日本中部三波川变质地形 Mikabu 绿岩带浅间火成岩杂岩中蛇纹石橄榄岩的伊尔瓦石”Mineral.Mag.59。

Agata T: "Ilvaite from a sepentinized peridotite in the Asama igneous complex, Mikabu greenstone belt, Sambagawa metamorphic-terrain,central Japan." Mineral. Mag.59. 489-496 (1996)

Agata T：“Ilvaite，产自日本中部三波川变质地形 Mikabu 绿岩带浅间火成岩杂岩中的七彩橄榄岩。”

Asami M.: "Monazite ages the chemical Th-U-total Pb isochron method for pelitic gneisses from the eastern Sor Rondane Mountains, East Antarctica." Proc. of NIPR Symposium on Antarctic Geosci.9. 49-64 (1996)

Asami M.：“独居石对来自南极洲东部 Sor Rondane 山脉东部的泥质片麻岩采用化学 Th-U-总 Pb 等时线方法进行老化。”

Suzuki K: "Re-Os dating of molybdenites from ore deposits in Japan : Implication for the closure temperature of the Re-Os system for molybdenite and the cooling history of molybdenum ore deposits" Geochim.Cosmochim.Acta. 60. 3151-3159 (1996)

Suzuki K：“日本矿床辉钼矿 Re-Os 定年：对辉钼矿 Re-Os 系统闭合温度和钼矿床冷却历史的影响”Geochim.Cosmochim.Acta。