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.

我们正在研究如何陨石母体形成通过检查元素的同位素组成在钼质量区。 陨石是太阳系历史的伟大档案。 在矿物基质中有微妙的线索，告诉我们行星形成需要多长时间以及在什么条件下形成。陨石中钼的同位素组成是解开太阳系起源和演化秘密的关键。钼有七种稳定的同位素，由各种核过程形成。钼的七种稳定同位素的质量范围从92到100原子质量单位。 这些核素是由快中子和慢中子俘获和质子俘获核合成以及短寿命放射性母体衰变的组合形成的。 同位素丰度的变化可能是由氧化还原环境的变化和高温岩浆流体的冷凝引起的。 我们解释这些数据，以更好地了解在母体形成过程中的元素结晶分离。 同位素丰度异常的研究，以阐明核合成物质的来源，以早期太阳系，并建立行星形成的时间和持续时间。 此外，不同的同位素特征和元素浓度被用来识别陨石的遗传起源。