杰泽罗陨石坑的土壤多样性以及与火星盖尔陨石坑的比较

IF 2.5 2区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS Icarus Pub Date : 2024-09-12 DOI:10.1016/j.icarus.2024.116299
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引用次数: 0

摘要

我们对火星土壤特别感兴趣,因为通过研究火星土壤成分的化学和矿物学与粒度的关系,可以帮助我们了解火星上发生的不同过程。细粒度的火星土壤被认为在整个火星上都是均匀的,因此代表了一个全球性的组成部分。在本研究中,我们报告了目前正在探索杰泽罗陨石坑的毅力号漫游车所搭载的SuperCam仪器分析的土壤目标。共分析了 343 个目标。它们的粒度分布证实了火星土壤中 250-900 μm 颗粒的稀少性,尽管更小和更大的颗粒都存在。我们发现,由于当地基岩的侵蚀,当地成分不仅存在于土壤中非常粗的颗粒或较大的砾石中,而且也存在于非常细的颗粒(小于 250 微米)中。我们在陨石坑底部和三角洲前沿都发现了一些富含橄榄石、辉石和碳酸盐的极粗颗粒,而只有在三角洲前沿才发现了富含植硅体的颗粒。我们利用 ChemCam 数据将杰泽罗细粒土壤目标与盖尔陨石坑的细粒土壤目标进行了比较。我们发现杰泽罗的细粒土壤没有硫酸镁的迹象,这与盖尔的观测结果截然不同。此外,杰泽罗的细粒土壤比盖尔的细粒土壤水化程度更高,这可能是由于其比表面积更大的缘故。
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Soil diversity at Jezero crater and Comparison to Gale crater, Mars

The martian soil is of particular interest as it can help us understand the different processes that have occurred on Mars by studying the chemistry and mineralogy of its constituents as a function of grain size. The fine-grained martian soil is thought to be homogeneous across the planet and thus to represent a global component. In this study we report on the soil targets analysed by the SuperCam instrument aboard the Perseverance rover, which is currently exploring Jezero crater. A total of 343 targets were analysed. Their grain size distribution confirms the sparsity of 250–900 Âμm particles in the martian soil, although both smaller and larger grains are present. We found that the local components, due to erosion of the local bedrock, are present not only in the very coarse grains or larger gravels of the soil, but also in the very fine ones (¡250 Âμm). We detected some very coarse grains enriched in olivine, pyroxene and carbonate in both the crater floor and the delta front locations, whereas phyllosilicate-rich grains have been encountered only in the delta front. We have compared the Jezero fine-grained soil targets with those of Gale crater using ChemCam data. We found that those at Jezero show no evidence of Mg sulfates, in contrast to the observation at Gale. In addition, the fine-grained soil at Jezero is more hydrated than that at Gale, probably due to its higher specific surface area.

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来源期刊
Icarus
Icarus 地学天文-天文与天体物理
CiteScore
6.30
自引率
18.80%
发文量
356
审稿时长
2-4 weeks
期刊介绍: Icarus is devoted to the publication of original contributions in the field of Solar System studies. Manuscripts reporting the results of new research - observational, experimental, or theoretical - concerning the astronomy, geology, meteorology, physics, chemistry, biology, and other scientific aspects of our Solar System or extrasolar systems are welcome. The journal generally does not publish papers devoted exclusively to the Sun, the Earth, celestial mechanics, meteoritics, or astrophysics. Icarus does not publish papers that provide "improved" versions of Bode''s law, or other numerical relations, without a sound physical basis. Icarus does not publish meeting announcements or general notices. Reviews, historical papers, and manuscripts describing spacecraft instrumentation may be considered, but only with prior approval of the editor. An entire issue of the journal is occasionally devoted to a single subject, usually arising from a conference on the same topic. The language of publication is English. American or British usage is accepted, but not a mixture of these.
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