Search of intersteller media and the evolution to planetary matters.

星际媒体搜索和行星物质的演化。

• 批准号: 09440186
• 负责人: YURIMOTO Hisayoshi
• 金额: $ 6.91万
• 依托单位: TOKYO INSTITUTE OF TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09440186/
• 关键词: Meteorite; Oxygen; Secondary ion mass spectrometry; interstellar medium; isotope microscope; solar system; isotope; 惑星系; 珪素; マグネシウム; 2次イオン質量分析法

Interstellar media in primitive meteorites are only clue to clarify presolar history. The difference between interstellar media and solar matters is only isotope ratio of elements. We have made in-situ measurements of isotope ratios, textures, shapes and crystal structures for individual fine particles in primitive meteorites. The goal of in this study is construction of new scenario for material evolution from interstellar media to planetary matters.A novel micro-scale analysis for oxygen isotope ratios has been developed by secondary ion mass spectrometry. A calcium-aluminum-rich inclusion (CAI) from the Allende meteorite was analyzed and found to contain melilite crystals with extreme oxygen-isotope compositions (-5 percent oxygen-16 enrichment relative to terrestrial oxygen-16). The oxygen isotopic variation measured among the minerals (melilite, spinel, and fassaite) indicates that crystallization of the CAI started from oxygen-16-rich materials that were probably liquid droplets in the solar nebula, and oxygen isotope exchange with the surrounding oxygen-16-poor nebular gas progressed through the crystallization of the CAI.Additional oxygen isotope exchange also occurred during subsequent reheating events in the solar nebula. The 160-rich dust and 160-poor gas continued together in the solar nebula from the CAI-forming period until the chondrule-forming period.A possible scenario for new evidence would be an active protosun with bipolar out-flow. Interstellar media near the protosun has been processed thermally and then launched into outer solar system. Therefore, composition of solar nebulae distributed heterogeneously along radial direction, The characteristics of composition and isotope ratio of each planet have been achieved in the first million years of solar system evolution.

原始陨石中的星际介质只是阐明前验历史的线索。星际介质和太阳事务之间的差异仅是元素的同位素比。我们对原始陨石中各个细颗粒的同位素比，纹理，形状和晶体结构进行了原位测量。这项研究的目的是构建从星际介质到行星问题的材料进化的新方案。一种新型的微尺度分析，用于氧同位素比率，是通过次级离子质谱法开发的。分析了来自Allende陨石的钙铝富含钙的包含（CAI），并发现含有具有极端氧 - 同位素组成的Melilite晶体（相对于陆氧氧相对于陆生氧-16）。在矿物质（Melilite，Spinel和Fassaite）中测得的氧同位素变异表明，CAI的结晶是从太阳星云中可能是富氧16的材料开始随后在太阳星云中重新加热事件。从CAI形成期到软骨形成期，在太阳星云中，在太阳星云中持续了160个富含160个贫困的气体。新证据的可能场景可能是带有双极分流的主动原苏联。在Protosun附近的星际介质已热处理，然后发射到外部太阳系中。因此，太阳星云的成分沿径向方向分布，在太阳系演化的前百万年中，已经达到了每个行星的组成和同位素比的特征。

项目成果

Kurosawa, M., Yurimoto, H. and Sueno, S.: "Patterns in the hydrogen and trace element compositions of mantle olivines." Phys.Chem.Min.24. 385-395 (1997)

Kurosawa, M.、Yurimoto, H. 和 Sueno, S.：“地幔橄榄石的氢和微量元素组成的模式。”

Yurimoto,H.,Ito,M.and Nagasawa,H.: "Oxygen isotope exchange between refractory inclusion in Allende and solar nebula gas." Science. 282. 1874-1877 (1998)

Yurimoto, H.、Ito, M. 和 Nagasawa, H.：“阿连德难熔包裹体与太阳星云气体之间的氧同位素交换。”

Yurimoto, H., Matsumoto, K., Kim, K.Kitajima, H., Kosaka, K.and Hirata, H.: "Development of solid-state two-dimensional ion imaging device and new computer control system for SIMS." Secondary Ion Mass Spectrometry SIMS X,Wiley. 987-990 (1997)

Yurimoto, H.、Matsumoto, K.、Kim, K.Kitajima, H.、Kosaka, K. 和 Hirata, H.：“固态二维离子成像装置和 SIMS 新型计算机控制系统的开发。”

Yurimoto, H., Matsumoto, K., Kim, K. Kitajima, H., Kosaka, K. and Hirata, H.: "Development of solid-state two-dimensional ion imaging device and new computer control system for SIMS." Secondary Ion Mass Spectrometry SIMS X. 987-990 (1997)

Yurimoto, H.、Matsumoto, K.、Kim, K. Kitajima, H.、Kosaka, K. 和 Hirata, H.：“固态二维离子成像装置和 SIMS 新型计算机控制系统的开发。”

Taura, H., Yurimoto, H., Kurita, K. and Sueno, S.: "Pressure dependence on partition coefficients for trace elements between olivine and the coexisting melts." Phys. Chem. Mineral.25. 469-484 (1998)

Taura, H.、Yurimoto, H.、Kurita, K. 和 Sueno, S.：“橄榄石与共存熔体之间微量元素分配系数的压力依赖性”。