Nuclear and chemical processes in the early solar system revealed by Zr, Mo, and Ru isotope abundances in iron meteorites

铁陨石中 Zr、Mo 和 Ru 同位素丰度揭示了早期太阳系的核和化学过程

• 批准号: 227646-2010
• 负责人: Wieser, Michael
• 金额: $ 1.24万
• 依托单位: University of Calgary
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2014
• 资助国家: 加拿大
• 起止时间: 2014-01-01 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=546788
• 关键词: Nuclear; chemical; processes; early; solar

We are investigating how meteorite parent bodies formed by examining the isotopic composition of elements in the molybdenum mass region. Meteorites are great archives of the history of the Solar System. Within the mineral matrix are subtle clues that tell us how long it took for the planets to form and under what conditions. The isotope composition of molybdenum in meteorites is a key to unlock the secrets of the origins and evolution of our Solar System. Molybdenum has seven stable isotopes formed by a variety of nuclear processes. The seven stable isotopes of molybdenum span a mass range from 92 to 100 atomic mass units. These nuclides were formed by a combination of rapid and slow neutron capture and proton capture nucleosynthesis as well as the decay of short-lived radioactive parents. Isotope abundance variations can be caused by changes in the redox environment and condensation of high-temperature magmatic fluids. We interpret these data to better understand the fractional crystallization of elements during the formation of the parent bodies. Isotope abundance anomalies are investigated to elucidate the sources of nucleosynthetic material to the early Solar System and establish the timing and duration of planetary formation. In addition, distinct isotope signatures and elemental concentrations are used to identify the genetic origins of meteorites.

我们正在研究如何通过检查钼质量区域元素的同位素组成而形成的陨石。 陨石是太阳系历史的伟大档案。 在矿物矩阵中，有细微的线索告诉我们行星形成多长时间以及在什么条件下。陨石中钼的同位素组成是解锁我们太阳系起源和演变的秘密的关键。钼具有七个由多种核过程形成的七个稳定同位素。钼的七个稳定同位素的质量范围为92至100个原子质量单位。 这些核素是通过快速和缓慢的中子捕获和质子捕获核合成以及短暂放射性父母的衰减的组合形成的。 同位素丰度变化可能是由氧化还原环境的变化和高温岩浆液的凝结引起的。 我们解释这些数据以更好地了解父体形成过程中元素的分数结晶。 研究同位素丰度异常，以阐明核合成物质的来源到早期的太阳系，并确定行星形成的时间和持续时间。 另外，使用不同的同位素特征和元素浓度来识别陨石的遗传起源。