Spectroscopic and TEM studies of phyllosilicates in carbonaceous chondrite

碳质球粒陨石中页硅酸盐的光谱和 TEM 研究

• 批准号: 08640600
• 负责人: NOGUCHI Takaaki
• 金额: $ 1.41万
• 依托单位: IBARAKI UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08640600/
• 关键词: visible light spectroscopy; L^* a^* b^* color system; sheet silicate; CM chondrite; serpentine; chlorite; aqueous alteration; L^*a^*b^*表色系; L^*a^*b^*色系; 蛇石; 層状珪酸塩鉱物; spinach; 顕微可視分光法; 変質

CM chondrites experienced aqueous alteration. Due to the aqueous alteration, mesostses in chondrules were replaced by phyllosilicates. Such phyllosilicates are various in colors, for example, green, yellowish green, yellowish brown, reddish brown, and so on. In this study, phylloslicates in Murchison, Murray, Y75293, Y791 198, Mighei, Nogoya, and Y82042 were investigated by visible light spectroscopy and electron microprobe analysis. Colors of such phyllosilicates were compared quantitatively by using L*a*b* color system. Compared with compositional variation of the phyllosilicates among differently altered CM chondrites, changes in colors in the phyllosilicates are complex. Complexity of changes in color depends on both the differences in minerals which suffered alteration and redox states during phyllosilicate formation. Differences in colors in phyllosilicates are due to broad absorption band around 700 nm (probably due to IVCT between Fe^<3+> and Fe^<2+>) and a shoulder around 450-500 nm (probably due to six coordinated Fe^<3+> cations). It is expected that green phyllosilicates and reddish brown ones have different Fe^<3+>/Fe^<2+> ratios. We are now seeking a convenient method to acquire Fe^<3+>/Fe^<2+> ratios in serpentine-group minerals.

CM软管经历了水性改变。由于水的改变，软骨硅酸盐代替了软骨中的中孔。这样的植物硅酸盐的颜色各不相同，例如绿色，淡黄绿色，淡黄棕色，红棕色等等。在这项研究中，通过可见光光谱和电子微型探针分析研究了默里（Murray），Y75293，Y791 198，Mighei，Nogoya和Y82042的Phyllosicates。使用L*a*b*颜色系统定量比较此类纤维素的颜色。与不同改变的CM软骨变化的植物硅酸盐的组成变化相比，苯硅酸盐中颜色的变化很复杂。颜色变化的复杂性取决于矿物质变化和氧化还原状态的矿物质差异。植物硅酸盐中颜色的差异是由于700 nm左右的广泛吸收带引起的（可能是由于Fe^<3+>和Fe^<2+>之间的IVCT引起的），肩膀约为450-500 nm（可能是由于六个协调的Fe^<3+>阳离子）。预计绿色的Phyllosilates和Reddish Brown具有不同的fe^<3+>/fe^<2+>比例。现在，我们正在寻求一种方便的方法来获取蛇形组矿物中的Fe^<3+>/fe^<2+>比率。

项目成果

T.Noguchi et al.: "Spectroscopic and TEM study of phyllosilicates in CM chondnite" Meteoritics and planetary Science.

T.Noguchi 等人：“CM 球粒陨石中层状硅酸盐的光谱和 TEM 研究” 陨石学和行星科学。

T.Noguchi et al.: "Spectroscopic and SQUID study of serpentine group minerals" Mineralogical Journal.

T.Noguchi 等人：“蛇纹石族矿物的光谱和 SQUID 研究”矿物学杂志。

M.Kimura, T.Noguchi, Y.Lin, and O.Wang: "Synthetic and natural rock systems (eds.Oupta, Onuma, Atima)" Allied Publishing Led., 283 (1997)

M.Kimura、T.Noguchi、Y.Lin 和 O.Wang：“合成和天然岩石系统（编辑 Oupta、Onuma、Atima）” Allied Publishing Led.，283 (1997)

T.Noguchi: "Ultramicrotomy and its application to the study of meteorites and cosmic austs." Chikyu kagaku. 32. 215-223 (1998)

T.Noguchi：“超薄切片术及其在陨石和宇宙奥斯特研究中的应用。”

野口高明・今栄直也: "隕石と宇宙塵の鉱物学・岩石学" 地球化学. 32. 175-184 (1988)

Takaaki Noguchi 和 Naoya Imaei：“陨石和宇宙尘埃的矿物学和岩石学”地球化学 32. 175-184 (1988)。