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

本研究采用年代学与岩石学、同位素相结合的方法，对46亿年前太阳系原始球粒陨石形成的第一批固体物质(耐火包裹体和球粒陨石)进行了研究。采用高精度的镁同位素测量方法，用二次离子质谱仪测定了粗粒富钙铝包裹体(CAI)中放射性成因的~(26)~(26)&~(26)Mg的单个矿物。根据矿物的氧同位素组成，每一种矿物都显示了各自的矿物等时线。这表明太阳星云中多次加热的年代性重置事件是由26&gt；26&gt；26&gt；mg系统估算的。

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.