A new chronology of the early solar system

早期太阳系的新年表

• 批准号: 18714276
• 负责人: Professor Dr. Carsten Münker
• 金额: --
• 依托单位: Institut für Geologie und Mineralogie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/18714276?language=en
• 关键词: new; chronology; early; solar; system

Recent analytical advances in isotope geochemistry have started to lead to a fundamental revision of our understanding of early solar system chronology. Classical models regarded chondritic meteorites as the oldest and most primitive solar system matter, building planets and planetesimals. Many planetesimals subsequently differentiated and developed metal cores and silicate mantles. Combined Hf-W, U-Pb and Al-Mg chronology now suggests that iron meteorites are remnants of even older planetesimals and that some of the material that makes up chondritic meteorites is reprocessed material from these early formed planetesimals. In two related projects we will evaluate the newly proposed chronological scheme by (1) dating of early solar system materials with different chronometers (i.e., Hf-W) and (2) by assessing homogenisation processes in the early solar system through 180Ta and 180W measurements. Both isotopes are very rare and extremely sensitive to nucleosynthetic conditions. Hence, sufficiently precise measurements were nearly impossible in the past. A prerequisite for resolving these key issues is the availability of a state of the art mass spectrometer (new generation Multicollector ICPMS) for the relevant analyses. No such instrument is currently used for research in cosmochemistry at a German university or research institution.

同位素地球化学的最新分析进展已经开始导致我们对早期太阳系年代学的理解发生根本性的修正。经典模型认为球粒陨石是太阳系最古老、最原始的物质，可以形成行星和星子。许多星子随后分化并发展出金属核心和硅酸盐地幔。结合 Hf-W、U-Pb 和 Al-Mg 年代学现在表明铁陨石是更古老的星子的残余物，并且构成球粒陨石的一些材料是这些早期形成的星子的再加工材料。在两个相关项目中，我们将通过以下方式评估新提出的年代方案：(1) 使用不同的计时器（即 Hf-W）对早期太阳系材料进行测年，以及 (2) 通过 180Ta 和 180W 测量来评估早期太阳系的均质化过程。两种同位素都非常稀有，并且对核合成条件极其敏感。因此，过去几乎不可能进行足够精确的测量。解决这些关键问题的先决条件是拥有最先进的质谱仪（新一代多接收ICPMS）进行相关分析。德国大学或研究机构目前还没有使用此类仪器进行宇宙化学研究。

项目成果

Refractory element fractionation in the Allende meteorite: Implications for solar nebula condensation and the chondritic composition of planetary bodies

• DOI: 10.1016/j.gca.2012.02.006
• 发表时间: 2012-05
• 期刊: Geochimica et Cosmochimica Acta
• 影响因子: 5
• 作者: A. Stracke;H. Palme;M. Gellissen;C. Münker;T. Kleine;Karin Birbaum;D. Günther;B. Bourdon;J. Zipfel

Alpha-decay of 184Os revealed by radiogenic 180W in meteorites: Half life determination and viability as geochronometer

陨石中放射源 180W 揭示了 184Os 的 α 衰变：半衰期测定和作为地质计时器的可行性

• DOI: 10.1016/j.epsl.2014.01.030
• 发表时间: 2014
• 期刊: Earth and Planetary Science Letters
• 影响因子: 5.3
• 作者: Peters;Münker;Becker;Schulz
• 通讯作者: Schulz

p-Process 180W anomalies in iron meteorites: Nucleosynthetic versus non-nucleosynthetic origins

• DOI: 10.1016/j.epsl.2012.11.009
• 发表时间: 2013-01-15
• 期刊: EARTH AND PLANETARY SCIENCE LETTERS
• 影响因子: 5.3
• 作者: Schulz, Toni;Muenker, Carsten;Peters, Stefan T. M.
• 通讯作者: Peters, Stefan T. M.

Formation and exposure history of non-magmatic iron meteorites and winonaites: Clues from Sm and W isotopes

非岩浆铁陨石和winonaites的形成和暴露历史：来自Sm和W同位素的线索

• DOI: 10.1016/j.gca.2012.02.012
• 发表时间: 2012
• 期刊: Geochimica et Cosmochimica Acta
• 影响因子: 5
• 作者: Schulz;Upadhyay;Münker;C. Mezger
• 通讯作者: C. Mezger