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: 2219463
• 负责人: Simone Marchi
• 金额: $ 15.37万
• 依托单位: Southwest Research Institute
• 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=2219463&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.

我们的星球由来自新兴太阳系各个部分的天体形成。要了解这颗唯一已知的可居住行星的起源和最初组成，需要了解地球在太阳系中形成的时间和地点。这个地球科学部-其他世界的地球科学教训（GLOW）奖支持一个项目，旨在扩大和加深对地球形成物质以及它们如何演变成可居住星球的理解。该项目将陨石（行星形成的碎片）中成熟的宇宙化学同位素示踪剂与陆地地球化学示踪剂相结合，以识别在行星形成末期添加的地球构建模块的组成。地球历史上的这一时期可能见证了一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。它还协调早期和中期职业科学家，以促进样本数据和数值影响模型的方法和解释的整合，使其与更广泛的行星科学界和学生团体相关并可供其使用。了解唯一已知的可居住行星的起源和初始组成需要了解太阳系中地球的构建块何时何地增生。该项目将陨石中亲铁（爱铁）元素的公认遗传示踪能力与地球地球化学数据相结合，以限制地球形成末期的组成成分。地球历史上的这一时期可能见证了一部分波动预算的交付（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，该项目将评估晚期吸积如何改变地幔亲铁同位素组成。该项目将产生一个独特的和自洽的亲铁同位素数据集的地幔衍生材料，以限制几个未经研究的陆地地幔域的组成。通过将这些和其他陆地同位素数据与已发表的陨石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。样品衍生的同位素数据将被整合到混合计算告知平滑粒子流体动力学的影响模拟，预测所得地幔成分后，晚acceptanceofimpacters.This奖项反映了NSF的法定使命，并已被认为是值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估的支持。