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The chemical composition of Martian soil and rocks returned by the mobile alpha proton X-ray spectrometer: preliminary results from the X-ray mode

机译:移动α质子X射线光谱仪返回的火星土壤和岩石的化学成分:X射线模式的初步结果

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摘要

The alpha proton x-ray spectrometer (APXS) on board the rover of the Mars Pathfinder mission measured the chemical composition of six soils and five rocks at the Ares Vallis landing site. The soil analyses show similarity to those determined by the Viking missions. The analyzed rocks were partially covered by dust but otherwise compositionally similar to each other. They are unexpectedly high in silica and potassium, but low in magnesium compared to martian soils and martian meteorites. The analyzed rocks are similar in composition to terrestrial andesites and close to the mean composition of Earth's crust. Addition of a mafic component and reaction products of volcanic gases to the local rock material is necessary to explain the soil composition.
机译:火星探路者任务的漫游车上的α质子X射线光谱仪(APXS)测量了Ares Vallis着陆点的六种土壤和五种岩石的化学成分。土壤分析显示与维京任务确定的相似。被分析的岩石部分被灰尘覆盖,但在组成上彼此相似。与火星土壤和火星陨石相比,它们的二氧化硅和钾含量出乎意料地高,而镁含量低。被分析的岩石的成分与陆安山岩相似,并且接近地壳的平均成分。必须向基岩材料中添加镁铁质成分和火山气体的反应产物,以解释土壤成分。

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