Research on concentrations and isotopic abundances of retractory siderophile elements in Ca, Al-rich inclusions and estimation of chemical and physical conditions of the primitive solar nebula

富Ca、Al包裹体中回缩亲铁元素浓度和同位素丰度研究及原始太阳星云化学物理条件估算

基本信息

批准号：
09640588
负责人：
YONEDA Shigekazu
金额：
$ 2.11万
依托单位：
National Science Museum
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
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

项目摘要

In order to estimate chemical and physical conditions of the primitive solar nebula, Ca, Al-rich inclusions in the Allende CV3 chondrite were investigated. Methods for quantitative analysis and isotopic ratio measurement of refractory siderophile elements were developed and a search for extinct nuclides was performed.Three Ca, Al-rich inclusions including a lcm-radius spherule were separated from three specimens of the Allende meteorite in the collection of the, National Science Museum A11 of them are coarse-grained inclusions and, from observation using SEM-EDX, one is classified as a Type A inclusion with melilite and spinel ; another inclusion is probably a Type C because of high abundance of anorthite ; the other could be a Type B Using a SIMS at Hiroshima University, Mg-26 excesses due to the extinct nuclideAl-26 were observed in anorthite of the Type C inclusion Also, a trace of the extinct nuclide Cs-135 was detected in an acid-soluble fraction in an H chondriteMethods for quantitative analysis of refractory siderophile elements using an ICP-MS were explored in addition to the well-developed NAA methods. Change of sensitivities of the refractory siderophile elements had to be monitored and severe memory, effects were observed at the measurements of Os. For the negative thermal ionization mass spectrometry of the platinum group elements and other siderophile elements, basic behaviors of formation of negative thermal ions from a mixed solution were investigated in collaboration with Prof. K CJ. Heumann at the University of Mainz Using a Pt single filament method, the intensities of negative thermal ions from the same amount of elements were Re > Os > Ir -- Ru > Mo The Re filament method could be used for better ionization of W and Mo.

为了估计原始太阳星云的化学和物理条件，CA，Alende CV3软骨中富含Al的夹杂物。开发了用于定量分析和同位素比测量的方法，并进行了搜索灭绝核素的搜索。三个CA，包括LCM-Radius Spherule在内的三个CA，包括LCM-Radius Spherule在内的三个标本，从三个标本中分离出来，从三个标本中，在诸如国家科学博物馆的集合中，均与国家科学的元素相比，与国家科学杂物相同，并与国家科学博物馆的收藏中的分类，并从一种与Melilite和尖晶石的融合在一起；另一个包容性可能是C型，因为丰富的铜矿。 the other could be a Type B Using a SIMS at Hiroshima University, Mg-26 excesses due to the extinct nuclideAl-26 were observed in anorthite of the Type C inclusion Also, a trace of the extinct nuclide Cs-135 was detected in an acid-soluble fraction in an H chondriteMethods for quantitative analysis of refractory siderophile elements using an ICP-MS were explored in addition to the发达的NAA方法。必须监测难治性的副反应元件的敏感性的变化并在OS的测量中观察到效果。对于铂组元素和其他铁质元素的负热电离质谱，与K CJ教授合作研究了从混合溶液中形成负热离子的基本行为。 Mainz大学的Heumann使用PT单细丝方法，来自相同元素的负热离子的强度是重新> os> ir -ru> mo re re丝方法可用于更好地电离W和Mo。