CAIs in chondrites

Calcium-aluminum-rich refractory inclusions (CAIs) in chondrites are the oldest Solar System solids (2-3 Myr older than chondrules, see Chapters 1 and 9). The mineralogy, petrographic, chemical, and isotopic characteristics of these primitive solids constrain the physical and chemical processes through which these materials have been processed (Zhu et al. 2001 Becker Walker 2003 Biz-zarro et al. 2004 Chaussidon et al. 2008). The primordial presolar grains were... 

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