Understanding Impact Events in the Earth-Moon System

了解地月系统中的撞击事件

• 批准号: 1008819
• 负责人: Nicolle Zellner
• 金额: $ 10.8万
• 依托单位: Albion College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-09-01 至 2014-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1008819&HistoricalAwards=false
• 关键词: Understanding; Impact; Events; Earth; Moon

In this project, the PI will conduct laboratory measurements of the ages and chemical compositions of lunar impact glass samples obtained by the Apollo astronauts. At least 30 samples will be analyzed, using X-ray spectroscopy to determine the abundances of silicon, titanium, aluminum, chromium, iron, manganese, magnesium, calcium, sodium, and potassium, and using the laser step-heating argon-40/argon-39 method to determine the age. By combining chronological and geochemical data, the PI plans to constrain the number and distribution of impacts that formed the impact glasses found at each Apollo landing site, and thereby elucidate the impact history of the Moon. She will assess the evidence for a large impact or increased rate of impacts 800 million years ago, and examine whether lunar impacts can be associated with terrestrial mass extinctions. Conducting this research at an undergraduate institution, the PI will train undergraduate students in geochemical laboratory techniques and the use of extraterrestrial samples.

在这个项目中，PI将对阿波罗宇航员获得的月球撞击玻璃样本的年龄和化学成分进行实验室测量。将分析至少 30 个样品，使用 X 射线光谱法测定硅、钛、铝、铬、铁、锰、镁、钙、钠和钾的丰度，并使用激光步进加热氩 40/ argon-39法测定年龄。通过结合年代和地球化学数据，PI 计划限制在每个阿波罗着陆点发现的撞击玻璃的撞击数量和分布，从而阐明月球的撞击历史。她将评估 8 亿年前发生巨大影响或影响速度加快的证据，并研究月球影响是否与陆地大规模灭绝有关。项目负责人将在本科院校开展这项研究，对本科生进行地球化学实验室技术和外星样本的使用方面的培训。