Allenium Curious Marie富钙铝包裹体中的前太阳SiC证据
Evidence of presolar SiC in the Allende Curious Marie calcium aluminum rich inclusion
摘要：
富钙铝包裹体（CAIs）是太阳星云中最早形成的固体之一，而太阳前颗粒则形成于各种演化的恒星环境中。人们普遍认为，CAIs是在接近太阳的温度超过1500 K时形成的，在那里前太阳颗粒无法存活，然后被运送到星云的其他区域，在那里发生了星子的吸积。在这种情况下，一个普遍的观点是，前太阳颗粒只存在于球粒周围的细粒边缘和低温细粒基质中，这些基质将各种陨石成分结合在一起。在这里，我们证明，基于惰性气体同位素的签名，前太阳能SiC已被纳入细粒度的CAI在Allenburg碳质球粒陨石在其形成的时候，并已存活的母体处理。这一发现为了解初生太阳系中第一批固体凝结时的条件提供了新的线索。
英文摘要：
Calcium aluminum rich inclusions (CAIs) are one of the first solids to have condensed in the solar nebula, while presolar grains formed in various evolved stellar environments. It is generally accepted that CAIs formed close to the Sun at temperatures above 1500 K, where presolar grains could not survive, and were then transported to other regions of the nebula where the accretion of planetesimals took place. In this context, a commonly held view is that presolar grains are found solely in the fine-grained rims surrounding chondrules and in the low-temperature fine-grained matrix that binds the various meteoritic components together. Here we demonstrate, based on noble gas isotopic signatures, that presolar SiC have been incorporated into fine-grained CAIs in the Allende carbonaceous chondrite at the time of their formation, and have survived parent body processing. This finding provides new clues on the conditions in the nascent solar system at the condensation of first solids.
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