Contemporaneous formation of chondrules and refractory inclusions in the early Solar System
Contemporaneous formation of chondrules and refractory inclusions in the early Solar System
复制标题
早期太阳系中球粒和难熔包裹体的同时形成
DOI：
10.1038/nature01699
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发表时间：
2003
期刊：
影响因子：
64.8
通讯作者：
H. Yurimoto
中科院分区：
文献类型：
--
作者：
S. Itoh;H. Yurimoto
球粒和富含钙铝的包裹体（CAIs）是太阳系早期历史中保存下来的物质，它们是在持续数百万年的各种闪热事件中对预先存在的固体进行热处理的结果。CAIs被认为是在陨石球粒形成之前大约200万年形成的。在这里，我们报告的发现嵌入在CAI的球粒碎片。球粒的组成是穷人在16O，而CAI有一个16O贫黄长石（钙，镁，铝硅酸盐）核心包围的16O丰富的火成岩地幔。这些观察结果，当与以前报道的CAI轴承球粒，强烈建议，球粒和CAI的形成重叠的时间和空间，并在太阳星云的氧同位素组成可能同步天体物理脉冲有很大的波动。
Chondrules and calcium-aluminium-rich inclusions (CAIs) are preserved materials from the early history of the Solar System, where they resulted from thermal processing of pre-existing solids during various flash heating episodes which lasted for several million years. CAIs are believed to have formed about two million years before the chondrules. Here we report the discovery of a chondrule fragment embedded in a CAI. The chondrule's composition is poor in 16O, while the CAI has a 16O-poor melilite (Ca, Mg, Al-Silicate) core surrounded by a 16O-rich igneous mantle. These observations, when combined with the previously reported CAI-bearing chondrules, strongly suggest that the formation of chondrules and CAIs overlapped in time and space, and that there were large fluctuations in the oxygen isotopic compositions in the solar nebula probably synchronizing astrophysical pulses.