Collaborative Research: GLOW Tracing Earths Accretion Using Siderophile Element Genetics

合作研究：GLOW 使用亲铁元素遗传学追踪地球吸积

• 批准号: 2220922
• 负责人: Katherine Bermingham
• 金额: $ 46.6万
• 依托单位: Rutgers University New Brunswick
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-09-01 至 2025-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2220922&HistoricalAwards=false
• 关键词: Collaborative; Research; GLOW; Tracing; Earths

Our planet formed from bodies that were sourced from various parts of the emerging Solar System. To understand the origin and initial composition of the only known habitable planet, knowledge of when and from where Earth’s building blocks formed in the Solar System is required. This Division of Earth Sciences - Geoscience Lessons for and from Other Worlds (GLOW) award supports a project which aims to broaden and deepen the understanding of what materials made Earth and how they evolved into a habitable planet. The project combines well-established cosmochemical isotopic tracers in meteorites, the debris of planet formation, with terrestrial geochemical tracers to identify the composition of Earth’s building blocks that were added towards the end of the planet’s formation. This period in Earth’s history may have witnessed delivery of a portion of life-seeding materials, making it a prime target for study. The project serves to support and educate graduate and undergraduate students to help meet a growing demand for cross-disciplinary planetary science research projects at the university level. It also coordinates early and mid-career scientists to facilitate integration of methods and interpretations of sample data and numerical impact models to make them relevant and accessible to the broader planetary science community and student body. Understanding the origin and initial composition of the only known habitable planet requires knowledge of when and from where in the Solar System Earth’s building blocks accreted. This project combines the well-established genetic tracer capabilities of siderophile (iron-loving) elements in meteorites with terrestrial geochemical data to constrain the composition of Earth’s building blocks towards the end of its formation. This period in Earth’s history may have witnessed delivery of a portion of the volatile budget (e.g., H, N, C, O, S compounds), making it a prime target for study. To investigate the nature of material added during this stage of accretion, the project will assess how late accretion modified mantle siderophile isotopic compositions. The project will generate a unique and self-consistent siderophile isotopic dataset of mantle-derived materials to constrain the composition of several unstudied terrestrial mantle domains. The genetics of building blocks accreted late in Earth’s history will be advanced by contrasting these and other terrestrial isotopic data with published genetic isotope data in meteorites. Sample-derived isotopic data will be integrated into mixing calculations informed by smoothed particle hydrodynamic impact simulations that predict resultant mantle compositions following late accretion of impactors.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

我们的星球是由来自新兴太阳系各个部分的天体组成的。为了了解这颗已知的唯一可居住行星的起源和初始组成，需要了解地球在太阳系中何时何地形成的积木。地球科学部--其他世界的地球科学课程(GLOW)奖支持一个项目，该项目旨在扩大和加深对地球是由什么物质构成以及它们是如何演变成一个宜居星球的理解。该项目结合了陨石中公认的宇宙化学同位素示踪剂，即行星形成的碎片，与陆地地球化学示踪剂相结合，以确定在行星形成末期添加的地球积木的组成。地球历史上的这段时期可能见证了部分生命播种材料的交付，使其成为研究的主要目标。该项目旨在支持和教育研究生和本科生，以帮助满足大学一级对跨学科行星科学研究项目日益增长的需求。它还协调职业生涯早期和中期的科学家，以促进对样本数据和数值影响模型的方法和解释的整合，使它们与更广泛的行星科学界和学生团体相关和可获得。要了解这颗已知的唯一宜居行星的起源和初始组成，就需要知道地球的积木在太阳系的何时何地积累起来。该项目将陨石中亲铁元素的遗传示踪能力与陆地地球化学数据结合起来，以限制地球形成末期的积木的组成。在地球历史上的这段时期，可能见证了一部分不稳定的预算的交付(例如，H、N、C、O、S化合物)，使其成为研究的主要目标。为了研究在这一阶段的吸积过程中添加的物质的性质，该项目将评估晚期的吸积作用如何改变地幔亲铁同位素组成。该项目将产生一个独特和自洽的地幔衍生物质的亲铁同位素数据集，以限制几个未被研究的陆地地幔区域的组成。通过将这些和其他陆地同位素数据与已公布的陨石中的遗传同位素数据进行对比，将推进地球历史后期积累的积木的遗传学。来自样品的同位素数据将被整合到混合计算中，这些计算通过平滑的粒子流体动力学撞击模拟来预测撞击后期吸积后的地幔成分。这一奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。