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

将SNC陨石类别与火星联系起来的最强有力的证据是，其中几块陨石中存在一种气体成分(惰性气体、氮气、二氧化碳)，这与火星大气的组成(在海盗号大气测量的不确定范围内)一致。然而，火星陨石除了火星大气外，还含有其他气体成分。通过对不同(陆地)来源(炎热和寒冷的沙漠，秋天)的火星陨石结果的比较，他们的研究表明了一个复杂的问题。在来自炎热沙漠的陨石中发现了元素分馏的重惰性气体，这使得对这些陨石的数据进行解释变得困难。在试点研究中，我们发现了一种元素分馏空气(EFA)成分显示出特征，这很容易被误解为火星内部。我们计划通过分析陆地样品、火星陨石和实验室实验中风化的样品中的氮和惰性气体，更详细地确定全民教育组成部分的丰度和特征，并获得关于纳入机制的线索。在纳赫利特和ALH84001中观察到了与EFA相似的特征(如与各自的母质大气相比，84Kr/132Xe较低)，这可能是由于火星上作用的类似分馏过程所致。因此，我们的结果将使我们能够得出关于风化对火星岩石中挥发分的影响以及地球上污染过程造成的复杂情况的结论。

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.