STUDY OF EXTRA-SOLAR MATERIALS ON THE VIEW OF OXYGEN ISOTOPES

从氧同位素的角度研究太阳系外物质

• 批准号: 03640666
• 负责人: YURIMOTO Hisayoshi
• 金额: $ 1.28万
• 依托单位: UNIVERSITY OF TSUKUBA
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03640666/
• 关键词: METEORITE; CA,AL-RICH INCLUSION; OXYGEN ISOTOPE; SECONDARY ION MASS SPECTROMETRY; NEGATIVE HEAVY ION; 二次イオン質量分析法; アレンデ隕石

Extra-solar materials in Ca, Al-rich inclusions (CAIs) from Allende meteorite have been investigated in this projects. The project may be summarized as follows:(1)Concentration mapping of CAI minerals has been generated by electron micro probe analyzer. The results show crystallization sequences of the minerals.(2)A novel negative-metal ion source (BLAKE-V) for secondary ion mass spectrometry (SIMS) was developed for precise oxygen isotope analyses of CAI minerals.(3)A precise oxygen isotope analysis in CAI minerals was developed using the Au^- primary beam from the BLAKE-V ion source.(4)Oxygen isotope distribution was homogeneous in intra-mineral in CAI, whereas was quite heterogeneous among minerals. Such relationship cannot be interpreted by chemical equilibrium among minerals.(5)The origin of CAI may be interpreted as follows: (a)Spinel grains in CAIs ware crystallized in super novae remnant. (b)pyroxene grains were generated in the mixing gas between the solar nebula and the remnant at the most outer rim of the solar nebulae. (c)In the solar nebulae super cooling liquid was precipitated, and melilite and anorthite grains were crystallized in the liquid.

该项目对阿连德陨石中富含钙、铝的包裹体 (CAI) 中的太阳外物质进行了研究。该项目可概括如下：(1)利用电子微探针分析仪绘制了CAI矿物的浓度图。结果显示了矿物的结晶序列。(2)开发了一种用于二次离子质谱(SIMS)的新型负金属离子源(BLAKE-V)，用于CAI矿物的精确氧同位素分析。(3)精确氧同位素分析利用BLAKE-V离子源的Au^-主束对CAI矿物进行了分析。(4)CAI矿物内部氧同位素分布较均匀，而矿物间氧同位素分布相当不均匀。这种关系不能用矿物之间的化学平衡来解释。(5)CAI的成因可以解释如下：(a)CAI器中的尖晶石晶粒在超新星遗迹中结晶。 (b)辉石颗粒是在太阳星云和太阳星云最外缘残骸之间的混合气体中产生的。 (c)在太阳星云中析出过冷液体，黄长石和钙长石晶粒在液体中结晶。

项目成果

Yurimoto, H., Oishi, K., Nagasawa, H., Yuasa, H. and Sueno, S.: "Sector-zoned pyroxene in Allende CAI and the implications for oxygen isotope distribution." Papers presented to the 16th sympos. Antarct. Meteor.60-61 (1991)

Yurimoto, H.、Oishi, K.、Nagasawa, H.、Yuasa, H. 和 Sueno, S.：“阿连德 CAI 中的扇形辉石及其对氧同位素分布的影响。”

Sakaguchi,I.: "Strontium and silicon simultaneous diffusion in single-crystal MgO." J.Am.Ceram.Soc.75. 3477-3480 (1992)

Sakaguchi,I.：“单晶氧化镁中锶和硅的同时扩散。”

Uegomori, H., Kurita, K., Yurimoto, H. and Sueno, S.: "Size distribution and shape analysis of metal particles in ordinary chondrites." Papers presented to the 17th sympos. Antarct. Meteor.77-78 (1992)

Uegomori, H.、Kurita, K.、Yurimoto, H. 和 Sueno, S.：“普通球粒陨石中金属颗粒的尺寸分布和形状分析。”

Sakaguchi, I., Yurimoto, H. and Sueno, S.: "Strontium and silicon simultaneous diffusion in single-crystal MgO." J. Am. Ceram. Soc.75. 3477-3480 (1992)

Sakaguchi, I.、Yurimoto, H. 和 Sueno, S.：“单晶 MgO 中的锶和硅同时扩散。”

山本 博規,圦本 尚義,森 義治,池上 清: "SIMS用負重イオン源の開発" Proc.BEAMS1991.111-114 (1991)

Hironori Yamamoto、Naoyoshi Kazumoto、Yoshiharu Mori、Kiyoshi Ikegami：“SIMS 负重离子源的开发”Proc.BEAMS1991.111-114 (1991)