Trace Elements in Antarctic Meteorites: Extraterrestrial Origin and Terrestrial Ice Sheet Processes

南极陨石中的微量元素：地外起源和陆地冰盖过程

• 批准号: 8715853
• 负责人: Michael Lipschutz
• 金额: $ 27.66万
• 依托单位: Purdue Research Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-05-01 至 1993-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8715853&HistoricalAwards=false
• 关键词: Trace; Elements; Antarctic; Meteorites; Extraterrestrial

Previous studies demonstrate that antarctic meteorites differ from non-antarctic falls in frequency of type. Antarctica sampled at least one, perhaps more, extraterrestrial populations in the past, different from that falling today elsewhere on earth. The research objectives of this project are threefold: to determine if the chemical weathering scale established for antarctic H/L chondrite ratio is a weathering artifact; to study the extent to which the nature of antarctic populations is site- and time-dependent; to chemically investigate antarctic meteorites of unique or rare type so as to establish chemical and thermal conditions during their formation. This research should enable the PI to use meteorites to further study the recent (10 year) history and dynamics of the antarctic ice sheet. Additionally, it should enable the PI to establish in what ways the near-earth meteoroid complex changed with time, how the changes relate to ice sheet history, and what they signify about the nature of meteorite parent bodies.

以往的研究表明，南极陨石与非南极陨石的坠落类型不同。南极洲过去至少采集了一个，也许更多的外星人种群，不同于今天地球上其他地方下降的种群。该项目的研究目标有三个：确定南极H/L球粒陨石比值所确定的化学风化标度是否是风化产物；研究南极人口的性质在多大程度上取决于地点和时间；对独特或罕见类型的南极陨石进行化学研究，以确定其形成过程中的化学和热条件。这项研究应该使PI能够利用陨石进一步研究南极冰盖最近(10年)的历史和动力学。此外，它应该使PI能够确定近地流星体复合体随时间以什么方式变化，这些变化如何与冰盖历史相关，以及它们对陨石母体的性质有何意义。