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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Oxygen isotope evidence for rapid mixing of the HED meteorite parent body
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Oxygen isotope evidence for rapid mixing of the HED meteorite parent body

机译：氧同位素证明HED陨石母体快速混合

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摘要

The ~(16)O, ~(17)O and ~(18)O abundances of howardites, eucrites, and diogenites have been used to assign them to a single 'HED' parent body, thought to be asteroid 4 Vesta. We report the first evidence of oxygen isotopic heterogeneity among HED meteorites indicating incompletely mixed sources. New high-precision oxygen isotope measurements of 34 HED meteorites reveal that most have the same Δ~(17)O', consistent with a very rapid early history of large-scale mixing on Vesta. However, howardites are on average very slightly enriched in 16O, whereas Ibitira, Caldera, Pasamonte, and ALHA78132 are ~(16)O-depleted compared to other investigated eucrites. The Δ~(17)O' of Ibitira is completely different from all other HEDs measured. Some of the results for eucrites and diogenites can be explained by partial melting and rapid mixing of the interior of Vesta. Others require a separate parent body or indicate that parts of the outer layer of Vesta retained some primary isotopic heterogeneity. The oxygen isotopic composition of howardites provides an upper limit for the amount of admixed carbonaceous chondritic material into the HED parent body regolith.
机译：球铁矿，真玉岩和重生物的〜（16）O，〜（17）O和〜（18）O丰度已用于将它们分配给单个“ HED”母体，被认为是小行星4 Vesta。我们报道了HED陨石中氧同位素异质性的第一个证据，表明混合源不完全。对34个HED陨石进行的新的高精度氧同位素测量表明，大多数HED陨石具有相同的Δ〜（17）O'，这与Vesta大规模混合的早期非常迅速的历史一致。然而，平均而言，芒how石的16O含量非常微弱，而相比其他调查的真玉，Ibitira，Caldera，Pasamonte和ALHA78132的〜（16）O损耗。 Ibitira的Δ〜（17）O'与所有其他HED完全不同。维斯塔内部的部分融化和快速混合可以解释某些质子和双辉石的结果。其他的则需要一个单独的母体，或者表明维斯塔外层的某些部分保留了一些主要的同位素异质性。芒ard石的氧同位素组成为混合到HED母体硬骨岩中的碳质软骨材料的含量提供了上限。

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