The SNC meteorites are from Mars

摘要: Abstract The 14 SNC meteorites are all igneous rocks, either basalts or basaltic cumulates. They inferred to be from Mars, based on direct comparison with Martian materials and consistency inferences about Mars. Most telling is that the contain traces of gas which very similar in elemental isotopic compositions modern atmosphere as measured by Viking landers Mars spectroscopy Earth. appears have a unique composition solar system, so its presence SNCs accepted strong evidence they formed Independent this link, must planet significant because several abundant components, one carries large fractionations characteristic atmospheric processing. Further, oxidation state consistent data situ analyses soils quite distinct other meteorites, rocks Earth, Moon. range formation ages for 4.5– 0.18 Ga , varied surface (based cratering record) inconsistent any system body. extreme chemical suggest complex internal processes planet, an asteroidal origin. Some were altered aqueous solutions at recent liquid groundwater independently geology surface. There seems little likelihood not If another planetary body, it would substantially identical now understood.