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Krypton in the Chassigny meteorite shows Mars accreted chondritic volatiles before nebular gases
Science ( IF 56.9 ) Pub Date : 2022-06-16 , DOI: 10.1126/science.abk1175
Sandrine Péron 1 , Sujoy Mukhopadhyay 1
Affiliation  

Volatile chemical elements are thought to have been delivered to Solar System terrestrial planets late in their formation, by accretion of chondritic meteorites. Mars can provide information on inner Solar System volatile delivery during the earliest planet formation stages. We measured krypton isotopes in the Martian meteorite Chassigny, representative of the planet’s interior. We find chondritic krypton isotope ratios, implying early incorporation of chondritic volatiles. Mars’ atmosphere has different (solar-type) krypton isotope ratios, indicating it is not a product of magma ocean outgassing or fractionation of interior volatiles. Atmospheric krypton instead originates from accretion of solar nebula gas, after the mantle formed, but prior to nebular dissipation. Our observations contradict the common hypothesis that, during planet formation, chondritic volatile delivery occurred after solar gas acquisition.

中文翻译:

Chassigny陨石中的氪显示火星在星云气体之前吸积了球粒状挥发物

挥发性化学元素被认为是在太阳系类地行星形成的后期通过球粒陨石的吸积而被传递到它们的。火星可以在最早的行星形成阶段提供有关太阳系内部挥发物传递的信息。我们测量了代表火星内部的火星陨石 Chassigny 中的氪同位素。我们发现了球粒陨石氪同位素比率,这意味着球粒陨石挥发物的早期掺入。火星大气具有不同的(太阳型)氪同位素比率,表明它不是岩浆海洋脱气或内部挥发物分馏的产物。相反,大气氪源于太阳星云气体的吸积,在地幔形成之后,但在星云消散之前。我们的观察结果与普遍的假设相矛盾,即在行星形成过程中,
更新日期:2022-06-16
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