Chondritic meteorites (chondrites; Fig. 1) are known as sedimentary space rocks that are pieces of asteroids. Chondrites contain submicron to centimeter objects that were likely formed at different timing and potentially different places in the protoplanetary disk.
      The chondritic components exhibit variations in their chemical compositions and isotopic ratios, which would reflect different formation conditions of each component. Pristine chondrites that avoided secondary alterations on the parent asteroids are expected to preserve formation histories of each component. Thus, detailed chemical and isotopic measurements of chondritic components will provide insights into the physicochemical conditions of the protoplanetary disk when and where they formed. Based on these information, I would like to reveal the formation, migration, and accretion processes of submicron to centimeter objects in the protoplanetary disk.