Implication of material evolution in the first million years in early solar system from chronological petrology in meteorite.

本研究结合岩石学和等拓扑学的年代学方法，研究了太阳系中最早形成于46亿年前几百万年的原始橄榄岩中的第一批固体物质（难熔包裹体和球粒）。采用二次离子质谱法对粗粒富钙铝包裹体（CAIs）中放射性成因Mg <26>Mg的单个矿物进行了高精度的Mg同位素测量。每个CAI中的矿物相对于各自的矿物氧同位素组成显示出^<26>Al-^<26>Mg的矿物等时线。这表明太阳星云中多重加热的时间重置事件是由^<26>Al-^<26>Mg系统估计的。

In this study, the chronological study combined with petrology and isotopology were applied to the first solid material (refractory inclusions and chondrules) from primitive chodrite in the solar system which formed at first several million years on the 4.6 billion years ago. High precision Mg isotope measurements have been performed to determine the individual minerals of radiogenic ^<26>Mg in coarse-grained Ca-Al-rich inclusions (CAIs) by secondary ion mass spectrometry. Minerals in each CAI show individual mineral isochrones of ^<26>Al-^<26>Mg with respect to each own oxygen isotopic composition of minerals. This indicates that the chronological resetting event by multiple heating in the solar nebula are estimated by ^<26>Al-^<26>Mg system.