Detection of the extinct nuclides by the precise isotopic ratio measurements and chronology of the early solar system
通过精确的同位素比测量和早期太阳系的年代学来检测灭绝的核素
基本信息
- 批准号:15340194
- 负责人:
- 金额:$ 8.58万
- 依托单位:
- 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
- 来源:
- 关键词:
项目摘要
Extinct nuclides are radioactive nuclides which existed in the early solar system but decayed thoroughly due to their short half lives. However, their daughter nuclides are often detected as isotopic anomalies in primitive meteorites such as carbonaceous meteorites, and this can be used for chronology of the early solar system. We have found the Ba isotopic anomaly in the Beardsley meteorite and suggested that this is due to the extinct nuclide Cs-135 (half life 2.3Ma). In the current study, we try to establish the existence of Cs-135 and apply it for chronology in the early solar systemWe measured the barium isotopic abundances in various meteorites, especially carbonaceous chondrites. Most carbonaceous chondrites of CI, CM, CR and CV groups show the Ba-135 and Ba-137 isotopic anomalies simultaneously, which imply that these anomalies are mainly due to nucleosynthesis of s-process and/or r-process. On the other hand, thermally-altered CK group carbonaceous chondrites and achondrites do not show any significant anomalies. Their Ba isotopic abundances could be homogenized at their parent bodies.Part of the r-process components in the barium isotopic anomalies of CM chondrites could be corrected and the Cs-135 chronology suggests the formation age of 7 (+5/-2) Ma. This age is shorter than the formation age of CI carbonates by Mn-53 extinct nuclide chronology and may suggest the re-distribution of Ba at the parent bodies.
绝灭核素是存在于太阳系早期的放射性核素,由于半衰期短而彻底衰变。然而,它们的子核素经常在原始陨石(如碳质陨石)中被检测到同位素异常,这可以用于早期太阳系的年代学。我们在Beardsley陨石中发现了Ba同位素异常,认为这是由于已灭绝的核素Cs-135(半衰期为2.3Ma)造成的。在目前的研究中,我们试图建立Cs-135的存在,并将其应用于早期太阳系的年代学。我们测量了各种陨石,特别是碳质球粒陨石的钡同位素丰度。CI、CM、CR和CV组的大部分碳质球粒陨石同时显示Ba-135和Ba-137同位素异常,表明这些异常主要是由s过程和(或)r过程核合成引起的。另一方面,热蚀CK组碳质球粒陨石和无球粒陨石未见明显异常。它们的Ba同位素丰度可以在母体中均匀化。CM球粒陨石钡同位素异常中的部分r过程成分可以得到修正,Cs-135年代学表明其形成年龄为7 (+5/-2)Ma。根据Mn-53绝灭核素年代学,这一年龄短于CI碳酸盐的形成年龄,可能表明Ba在母体中的重新分布。
项目成果
期刊论文数量(5)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Regolith history of the aubritic meteorite parent body revealed by neutron capture effects on Sm and Gd isotopes.
通过对 Sm 和 Gd 同位素的中子俘获效应揭示了赤铁矿陨石母体的风化层历史。
- DOI:
- 发表时间:2006
- 期刊:
- 影响因子:0
- 作者:上田真也*;小淵保幸;高橋幸弘;坂野井健;島崎準一;荘司泰弘;吉田和哉;Takao Fuji and Toshinori Suzuki;H.Hidaka
- 通讯作者:H.Hidaka
H.Hidaka, Y.Ohta, S.Yoneda: "Nucleosynthetic components of the early solar system inferred from Ba isotopic compositions in carbonaceous chondrites"Earth and Planetary Science Letters. 214. 455-466 (2003)
H.Hidaka、Y.Ohta、S.Yoneda:“根据碳质球粒陨石中的 Ba 同位素成分推断出早期太阳系的核合成成分”《地球与行星科学快报》。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
Sm and Gd isotopic shifts of Apollo 16 and 17 drill stem samples and their implications for regolith history
阿波罗 16 号和 17 号钻杆样本的 Sm 和 Gd 同位素变化及其对风化层历史的影响
- DOI:
- 发表时间:2007
- 期刊:
- 影响因子:0
- 作者:Hiroshi Hidaka;Shigekazu Yoneda
- 通讯作者:Shigekazu Yoneda
Nucleosynthetic components of the early solar system inferred from Ba isotopic compositions in carbonaceous chondrites
- DOI:10.1016/s0012-821x(03)00393-5
- 发表时间:2003-09-30
- 期刊:
- 影响因子:5.3
- 作者:Hidaka, H;Ohta, Y;Yoneda, S
- 通讯作者:Yoneda, S
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YONEDA Shigekazu其他文献
YONEDA Shigekazu的其他文献
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{{ truncateString('YONEDA Shigekazu', 18)}}的其他基金
Research on behaviors of the alkaline metal elements in the early solar system by the extinct nuclides chronology
用灭绝核素年代学研究早期太阳系碱金属元素的行为
- 批准号:
19540516 - 财政年份:2007
- 资助金额:
$ 8.58万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
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
- 批准号:
09640588 - 财政年份:1997
- 资助金额:
$ 8.58万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
相似海外基金
Attempt of ultra-high sensitivity detection for long half-life radioactive cesium-135 by accelerator mass spectrometry
加速器质谱超高灵敏度检测长半衰期放射性铯135的尝试
- 批准号:
21K18622 - 财政年份:2021
- 资助金额:
$ 8.58万 - 项目类别:
Grant-in-Aid for Challenging Research (Exploratory)