Study on the formation process of differentiated meteorites based on platinum group element abundances

基于铂族元素丰度的差异陨石形成过程研究

基本信息

批准号：
15340193
负责人：
EBIHARA Mitsuru
金额：
$ 10.62万
依托单位：
Tokyo Metropolitan University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

项目摘要

Platinum group elements (hereafter, PGE) are cosmochemically grouped in to refractory elements. They are geochemically grouped into siderophile elements, being concentrated into core in earth-type planets with relative abundances similar to solar system abundances. On the other hand, silicate layers represented by earth mantle and crust have extremely low concentrations of PGE with a large variation in their relative abundances. In this study, it was aimed that PGE were precisely determined for silicate fractions of various differentiated meteorites and that the formation processes of these meteorites were considered based on their relative and absolute abundances of PGE. For determining PGE, inductively-coupled plasma mass spectrometry was applied. In addition, activation analyses using neutrons and photons were also used for the determination of major and trace elements. As a representative group of differentiated meteorites, eucrites were targeted in 2005, following researches conducted in 2004. In addition to eucrites, silicate phases of mesosiderites also were studies in 2005. As a result, PGE in silicate portions of mesosiderites were observed to have genetic relation with iron meteorites. It is implied that metal grains present in silicate portions of mesosiderites were introduced as metal-sulfide melt, which was produced by partly melting of solid irons. This further suggests that mesosiderites formed by impact of iron meteorites onto the silicate target. Along these studies, PGE abundances were precisely and accurately determined for carbonaceous chondrites including CI chondrites so that relative abundances of PGE in various materials of meteorites can be figured reliably.

白金组元素（以下简称PGE）被宇宙化学分组为难治性元素。它们在地球化学上分为铁质元素，集中在地球型行星中，相对丰度类似于太阳系丰度。另一方面，由地幔和地壳代表的硅酸盐层具有极低的PGE，其相对丰度变化很大。在这项研究中，目的是精确确定PGE的各种分化陨石的硅酸盐分数，并且根据PGE的相对和绝对丰富性，考虑了这些陨石的形成过程。为了确定PGE，应用电感耦合的等离子体质谱法。另外，使用中子和光子的激活分析也用于测定主要元素和微量元素。作为一组代表性的分化陨石，在2004年进行的研究之后，在2005年对欧乐群落进行了瞄准。除了欧几里岩外，在2005年，层状的硅酸盐阶段也是研究的研究。结果，观察到sosiderite的硅酸盐部分中的PGE与铁陨石的遗传有关。这意味着将硅酸盐部分中存在的金属颗粒作为金属硫化物熔体引入，这是通过部分熔化固体熨斗产生的。这进一步表明，通过铁陨石对硅酸盐靶标的影响形成的中层。沿这些研究，PGE的丰度是精确，准确地确定了包括CI软骨的碳质软管，因此可以可靠地发现PGE在各种陨石中的相对丰度。

项目成果

期刊论文数量（20）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Precise determination of Sc in natural water by neutron activation analysis coupled with preconcentration of SC

中子活化分析结合 SC 预富集精确测定天然水中的 Sc

DOI：
发表时间：
2005
期刊：
Analytica Chimca Acta 553
影响因子：
0
作者：
H.Tkeda;A.Yamaguchi;H.Takeda et al.;A.Yamaguchi et al.;A.Yamaguchi;P.C.Buchanan;M.Nomura
通讯作者：
M.Nomura

Boron and chlorine abundances in Antarctic chondrites : A PGA study

南极球粒陨石中硼和氯的丰度：PGA 研究