早期太阳系的原太阳辐射：来自锂和硼同位素的线索
Protosolar Irradiation in the Early Solar System: Clues from Lithium and Boron Isotopes
摘要：
本文报道了从Murchison陨石中分离出的10个尖晶石-黑云母球粒（SHIB）的Li和B同位素组成，以了解它们在早期太阳系的辐照历史。SHIB中极低的Be浓度排除了灭绝的10 Be的检测，而是允许搜索颗粒的原始Li和B同位素比率，因为这些同位素是辐照的敏感指标。我们发现，一些SHIB携带亚铁电7 Li/6Li和超铁电10 B/11B比。考虑到在早期太阳系中可能发生的两种可能的辐照情况，辐照黑云母固体，然后加入同位素正常的Li和B似乎是对所观察到的Li和B同位素比的最合理的解释。
英文摘要：
We report Li and B isotopic compositions of 10 Spinel-HIBonite spherules (SHIBs) separated from the Murchison meteorite, in order to understand their irradiation history in the early Solar System. The extremely low Be concentrations in SHIBs preclude detection of extinct 10Be, but instead allow for a search of the original Li and B isotopic ratios of the grains, as these isotopes are sensitive indicators for irradiation. We found that some of the SHIBs carried sub-chondritic 7Li/6Li and supra-chondritic 10B/11B ratios. Considering two possible irradiation scenarios that could have occurred in the early Solar System, irradiation of hibonite solids followed by addition of isotopically normal Li and B seems to be the most plausible explanation for the observed Li and B isotope ratios.
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