Fraktionierung der schweren Edelgase und des Stickstoffs in Mars-Meteoriten als Folge terrestrischer und marsianischer Verwitterungsvorgänge

由于陆地和火星风化过程，火星陨石中重惰性气体和氮气的分馏

• 批准号: 18223948
• 负责人: Dr. Susanne Petra Schwenzer
• 金额: --
• 依托单位: Lunar and Planetary Institute
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2005
• 资助国家: 德国
• 起止时间: 2004-12-31 至 2006-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/18223948?language=en
• 关键词: Fraktionierung; der; schweren; Edelgase; und

The strongest evidence linking the class of SNC meteorites to Mars is the presence of a gas component (noble gases, nitrogen, CO2) in several of them, which agrees with the composition of the Martian atmosphere (within the uncertainties of the atmospheric measurements by Viking). However, Martian meteorites contain also other gas components in addition to Mars atmosphere. A complication in their study is indicated by the comparison of results for Martian meteorites of differing (terrestrial) provenance (hot and cold desert, fall). Elementally fractionated heavy noble gases were found to be incorporated in meteorites from hot deserts, which makes the interpretation of data from these meteorites difficult. In pilot studies we found an elementally fractionated air (EFA) component showing signatures, which can easily be misinterpreted as Martian interior. We plan - through the analysis of nitrogen and noble gases in terrestrial samples, Martian meteorites and samples weathered in laboratory experiments - to determine abundances and signatures of the EFA component in more detail and to obtain clues regarding the incorporation mechanism. Features similar to EFA (such as a low 84Kr/132Xe when compared to the respective parent atmosphere) are observed in the nakhlites and ALH84001 and are possibly due to similar fractionation processes acting on Mars. Thus our results will allow drawing conclusions regarding the influence of weathering on volatiles in Martian rocks on Mars as well as complications caused by contamination processes on Earth.

将SNC陨石与火星类别联系起来的最有力的证据是其中几个气体成分（贵重气体，氮，CO2）的存在，这与火星大气的组成（在维京人通过大气测量的不确定性中）一致。但是，火星陨石除了火星大气外，还含有其他气体成分。他们的研究中的并发症是通过比较火星不同（陆地）出处（秋季和冷dard）的陨石的结果来表明的。发现基本分离的重量贵重气体被发现掺入了来自热沙漠的陨石中，这使得从这些陨石中的数据解释很困难。在试点研究中，我们发现一个基本分离的空气（EFA）组件显示出签名，很容易被误解为火星内部。通过分析实验室实验中风化的陆生样品，火星陨石和样品中的氮气和贵重气体的分析，以更详细地确定EFA成分的丰度和特征，并获得有关合并机制的线索。在Nakhlites和Alh84001中观察到类似于EFA（例如，与各自的母体大气相比，与各自的母体大气相比，与EFA相似的特征（例如低84kr/132xe），可能是由于作用于火星上的类似分馏过程所致。因此，我们的结果将得出关于风化对火星岩石对火星挥发物的影响以及由地球上污染过程引起的并发症的结论。