论文标题
Allende好奇的Marie钙铝富含包含的Presolar SIC的证据
Evidence of presolar SiC in the Allende Curious Marie calcium aluminum rich inclusion
论文作者
论文摘要
钙富含钙的夹杂物（CAI）是最早在太阳星云中凝结的固体之一，而在各种进化的恒星环境中形成的前晶粒。人们普遍认为，在1500 K以上的温度下，CAI靠近太阳，那里的Presolar Grains无法生存，然后将其运输到星云的其他地区，那里发生了行星的积聚。在这种情况下，通常持有的观点是，前晶粒仅在软骨周围的细颗粒边缘以及在将各种陨石成分结合在一起的低温细粒基质中。在这里，我们证明，基于高贵的同位素特征，在形成时，已经将Presolar SIC纳入了Allende碳质软管中的细粒度CAI，并且在父母的身体加工中幸存下来。这一发现为初始固体的凝结时提供了有关新生太阳系条件的新线索。
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.
