Abstract The significant reorganization of the early Solar System due to giant planet migration has hampered our understanding of where planetary bodies formed. Previously employed proxies for reconstructing the primordial planetary architecture, such as water content or oxidation state, are complicated by post-accretionary processes. Here we investigate basaltic achondrites for their nucleosynthetic isotope signatures in the elements neodymium (Nd) and zirconium (Zr) and show that they are—similar to previously investigated chondritic meteorites—characterized by a relative deficit in isotopes produced by the s-process of nucleosynthesis. Importantly, these data are well correlated with nucleosynthetic signatures observed in other elements, demonstrating that s-process matter was heterogeneously distributed throughout the early Solar System. By comparing these isotopic signatures with potential proxies for Solar System reconstruction and computer modeling, we here argue that this isotopic heterogeneity in bulk meteoritic materials is linked to the original heliocentric distance of formation. Such scaling of nucleosynthetic signatures with heliocentric distance could permit reconstruction of the primordial architecture of the Solar System by ‘cosmolocating’ the accretion orbits of meteoritic parent bodies as a function of incorporated s-process matter.

中文翻译：

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同位素特征作为重建太阳系原始结构的工具

摘要 由于巨行星迁移，早期太阳系的重大重组阻碍了我们对行星体形成位置的理解。先前用于重建原始行星结构（例如含水量或氧化态）的代理因增生后过程而变得复杂。在这里，我们研究了玄武质无球粒陨石在元素钕 (Nd) 和锆 (Zr) 中的核合成同位素特征，并表明它们与之前研究的球粒陨石相似，其特征是核合成的 s 过程产生的同位素相对不足. 重要的是，这些数据与在其他元素中观察到的核合成特征密切相关，表明 s 过程物质在整个早期太阳系中分布不均。通过将这些同位素特征与太阳系重建和计算机建模的潜在代理进行比较，我们在这里认为，散装陨石材料中的这种同位素异质性与形成的原始日心距离有关。这种具有日心距离的核合成特征的缩放可以通过将陨石母体的吸积轨道“宇宙定位”作为合并的 s 过程物质的函数来重建太阳系的原始结构。