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Study of noble gas carrier "Q" in meteorites

陨石中稀有气体载体“Q”的研究

基本信息

批准号：
10440162
负责人：
MATSUDA Jun-ichi
金额：
$ 2.75万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10440162/
关键词：
Presolar diamond Allende Meteorite Noble gas Isotope Q HL

项目摘要

1. Laboratory experiments of change of Q by aqueous alterationWe put Allende matrix in a pressure vessel, and kept it at 200℃ for 1, 2, 3, and 4 weeks. The concentrations of Q and HL noble gases in both host phases (phase Q and presolar diamonds) decreased with increasing the duration time of the experiment. Furthermore, the phase Q seems to be more easily damaged compared to presolar diamonds. We found that cosmogenic and radiogenic components are also removed by the aqueous treatment.2. An attempt to separate Q and HLThe black floating material obtained by the freeze-thaw decomposition of the Allende meteorite is carbon and is very similar to the typical chemical residue of Allende in noble gas concentrations and isotopic components. We prepared 10 fractions of this material by the density separation. The noble gases are mostly enriched in the fraction with the density of 1.65g/cm3, and decrease in the higher density fractions. However, the isotopic compositions are more or less similar in all fractions, suggesting that the separation of Q and HL was not successful. It is likely that the phase Q is on the surface of presolar diamonds.3. The extraction of Q by organic solventsWe put Allende in toluene and tried to extract Q by organic solvent. We measured noble gas concentrations and isotopes in the extracted material and the residue. The noble gas components have no change by this treatment, indicating that Q is not removed by toluene.

1.水体改变Q值的实验室实验将Allende基质放入压力容器中，在200℃下保存1、2、3、4周。随着实验持续时间的增加，两个主相（Q 相和太阳前金刚石）中 Q 和 HL 稀有气体的浓度都降低。此外，与太阳系前的钻石相比，Q 相似乎更容易损坏。我们发现水处理也去除了宇宙成因和放射成因成分。2．分离Q和HL的尝试阿连德陨石冻融分解得到的黑色漂浮物质是碳，在稀有气体浓度和同位素成分方面与阿连德典型的化学残留物非常相似。我们通过密度分离制备了该材料的 10 份。稀有气体主要富集在密度为1.65g/cm3的馏分中，而在密度较高的馏分中减少。然而，所有馏分的同位素组成或多或少相似，表明 Q 和 HL 的分离并不成功。 Q相很可能位于太阳系前金刚石的表面。3．有机溶剂萃取Q 我们将阿连德放入甲苯中，尝试用有机溶剂萃取Q。我们测量了提取材料和残留物中的稀有气体浓度和同位素。通过该处理，稀有气体组分没有变化，表明Q没有被甲苯除去。