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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 >Nucleosynthetic components of the early solar system inferred from Ba isotopic compositions in carbonaceous chondrites
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Nucleosynthetic components of the early solar system inferred from Ba isotopic compositions in carbonaceous chondrites

机译：从碳质球粒陨石中的Ba同位素组成推断出早期太阳系的核合成成分

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The Ba isotopic composition of primitive meteorites is one of the more useful tracers to study nucleosynthetic processes in the early solar system, because the seven stable Ba isotopes consist of p-, r-, and s-process nucleosynthetic components and possible decay products from presently extinct ~(135)Cs. Ba isotopic analyses were performed on acid leachates from five carbonaceous chondrites, Murchison (CM2), Sayama (CM2), Allende (CV3), Isuna (CO3) and Maralinga (CK4), and one basaltic achondrite, Juvinas (Eucrite). The Ba isotopic data of acid treatment fractions in carbonaceous chondrites suggest the presence of independent nucleosynthetic components for s- and r-processes in the solar system. The isotopic patterns from the acid residual fractions of two CM2 meteorites, Murchison and Sayama, show an enrichment of s-process isotopes, which is similar to that of presolar SiC grains. On the other hand, their acid leachates have an excess of r-process components among the Ba isotopes. In many cases of carbonaceous chondrites other than CM meteorites, the excess of r-process isotopes is too small for a detailed discussion about the nucleosynthetic contribution. This may be interpreted as metamorphic destruction of presolar grains in meteorite matrices associated with petrographic-type meteorites. Juvinas shows no isotopic anomalies of Ba, because the isotopic record in the early solar system was reset possibly by magmatic processes in the parent body.
机译：原始陨石的Ba同位素组成是研究早期太阳系中核合成过程的更有用的示踪剂之一，因为七个稳定的Ba同位素由p-，r-和s-过程核合成成分以及目前可能的衰变产物组成。灭绝了〜（135）Cs对来自5个碳质球粒陨石（Murchison（CM2），Sayama（CM2），Allende（CV3），Isuna（CO3）和Maralinga（CK4）和一种玄武质陨石Juvinas（Eucrite）的酸性渗滤液进行了Ba同位素分析。碳质球粒陨石中酸处理组分的Ba同位素数据表明，太阳系中存在s和r过程的独立核合成成分。来自两个CM2陨石Murchison和Sayama的酸残留部分的同位素模式显示出富集的s-过程同位素，这与前期SiC晶粒相似。另一方面，它们的酸性浸出液在Ba同位素中具有过量的r-过程组分。在除CM陨石之外的许多碳质球粒陨石中，r过程同位素的过量量太小，无法详细讨论核合成作用。这可以解释为与岩石学类型的陨石有关的陨石矩阵中太阳前晶粒的变质破坏。 Juvinas没有显示Ba的同位素异常，因为早期太阳系中的同位素记录可能被母体的岩浆作用所重置。

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