Soil Diversity and Hydration as Observed by ChemCam at Gale Crater, Mars
Soil Diversity and Hydration as Observed by ChemCam at Gale Crater, Mars
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DOI：
10.1126/science.1238670
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发表时间：
2013-09-27
期刊：
影响因子：
56.9
通讯作者：
Yingst, A.
中科院分区：
文献类型：
--
作者：
Meslin, P-Y.;Gasnault, O.;Yingst, A.
ChemCam仪器在亚毫米尺度上提供了对火星土壤化学的深入了解，它确定了Currency漫游者穿越的两种主要土壤类型：细粒镁铁质类型和当地衍生的粗粒长英质类型。镁铁质土壤成分是广泛分布的火星土壤的代表，在成分上与火星尘埃相似。它拥有一个无处不在的氢签名在ChemCam光谱，对应于水化的非晶相在土壤中发现的CheMin仪器。这种水合作用可能是以前轨道测量所看到的全球表面水合作用的重要部分。ChemCam分析没有显示风化层和大气之间有任何显著的水蒸气交换。这些观察结果提供了对无定形相的性质及其水合作用的限制。
The ChemCam instrument, which provides insight into martian soil chemistry at the submillimeter scale, identified two principal soil types along the Curiosity rover traverse: a fine-grained mafic type and a locally derived, coarse-grained felsic type. The mafic soil component is representative of widespread martian soils and is similar in composition to the martian dust. It possesses a ubiquitous hydrogen signature in ChemCam spectra, corresponding to the hydration of the amorphous phases found in the soil by the CheMin instrument. This hydration likely accounts for an important fraction of the global hydration of the surface seen by previous orbital measurements. ChemCam analyses did not reveal any significant exchange of water vapor between the regolith and the atmosphere. These observations provide constraints on the nature of the amorphous phases and their hydration.