Solid‐state 13C NMR characterization of insoluble organic matter from Antarctic CM2 chondrites: Evaluation of the meteoritic alteration level
Solid‐state 13C NMR characterization of insoluble organic matter from Antarctic CM2 chondrites: Evaluation of the meteoritic alteration level
复制标题
南极 CM2 球粒陨石不溶性有机物的固态 13C NMR 表征：陨石蚀变水平的评估
DOI：
10.1111/j.1945-5100.2005.tb00979.x
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发表时间：
2005
影响因子：
2.2
通讯作者：
H. Kawashima
中科院分区：
文献类型：
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作者：
H. Yabuta;H. Naraoka;K. Sakanishi;H. Kawashima
摘要-通过固态13 C核磁共振（NMR）光谱分析了来自南极CM 2陨石（Yamato [Y-] 791198，793321; Belgica [B-] 7904; Asuka [A-] 881280，881334）和Murchison陨石的不溶性有机物（IOM）的化学结构。表征了不同类型的碳，例如脂肪族碳（Al 1-C）、与杂原子连接的脂肪族碳（He 2-Al 1-C）、芳香族碳（Aro-C）、羧基（COOR）和羰基（C=O）。来自Murchison和Y-791198的IOM的光谱显示出两个主峰：Ali‐C和Aro‐C，而来自其他陨石的光谱只显示出一个Aro‐C主峰。通过人工积分和解卷积确定碳分布。对于大多数IOM，Aro-C是所有碳类型中最丰富的（49.8-67.8%）。当将Al 1-C与Aro-C的比率（Ali/Aro）与原子氢与碳的比率（H/C）作图时，观察到相关性。如果用H/C作为陨石母体上热蚀变事件的参数，这一结果显示了不同程度的热蚀变。此外，具有较低Ali/Aro的IOM显示出较低的Ali-C与COOR + C=O的比率（Ali /（COOR + C=O））。这一结果表明，在IOM中的CO部分与脂肪族碳的比例可能反映了热液蚀变中所涉及的化学氧化。
Abstract— Chemical structures of the insoluble organic matter (IOM) from the Antarctic CM2 chondrites (Yamato [Y‐] 791198, 793321; Belgica [B‐] 7904; Asuka [A‐] 881280, 881334) and the Murchison meteorite were analyzed by solid‐state 13C nuclear magnetic resonance (NMR) spectroscopy. Different types of carbons were characterized, such as aliphatic carbon (Ali‐C), aliphatic carbon linked to hetero atom (Hetero‐Ali‐C), aromatic carbon (Aro‐C), carboxyls (COOR), and carbonyls (C=O). The spectra of the IOM from Murchison and Y‐791198 showed two major peaks: Ali‐C and Aro‐C, while the spectra from the other meteorites showed only one major peak of Aro‐C. Carbon distribution was determined both by manual integration and deconvolution. For most IOM, the Aro‐C was the most abundant (49.8–67.8%) of all carbon types. When the ratios of Ali‐C to Aro‐C (Ali/Aro) were plotted with the atomic hydrogen to carbon ratio (H/C), a correlation was observed. If we use the H/C as a parameter for the thermal alteration event on the meteorite parent body, this result shows a different extent of thermal alteration. In addition, IOM with a lower Ali/Aro showed a lower ratio of Ali‐C to COOR plus C=O (Ali / (COOR + C=O)). This result suggests that the ratio of CO moieties to aliphatic carbon in IOM might reflect chemical oxidation that was involved in hydrothermal alteration.
CM 球粒陨石中大分子有机物的化学序列。
DOI：
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发表时间：
2004
期刊：
Meteoritics Planet.Sci 39
影响因子：
--
作者：
H.Naraoka;H.Mita;M.Komiya;S.Yoneda;H.Kojima;A.Shimoyama;A.I.Khanchuk
通讯作者：
A.I.Khanchuk
利用碳质大分子物质的热解行为评估 CM 球粒陨石的热变质作用。
DOI：
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发表时间：
2002
期刊：
Geochim. Cosmochim Acta 66
影响因子：
--
作者：
Nakamura T.;Noguchi T.;Takaoka et al.;Tsuchiyama et al.;Noguchi et al.;Kitajima et al.
通讯作者：
Kitajima et al.