Carbonate Mineralogy of the C1 Clasts in Kaidun Meteorite

The Kaidun meteorite is a polymict microbreccia weighing approximately 850 g that fell in the People's Republic of South Yemen on December 3, 1980. Although the host material is CR chondrite, it is unique in that it contains many clasts of various chondritic and achondritic materials. Chondritic clasts include EH3-5, EL3, C1, C2, CM1, CM2, CV3, and ordinary chondrite-related materials. Achondrites include a high-Ca primitive achondrite, fragments of alkali-rich differentiated materials, and an aubrite-like clasts [1]. In this study, we focused on C1 materials. There is plenty of evidence that aqueous alteration in the carbonaceous chondrite clasts in Kaidun occurred primarily on their parent bodies before accumulation to a Kaidun body/ Therefore, observations of the C1 materials, which are highly aqueously altered, can provide quantitative constraints on the geologic history of their asteroid parent bodies. In addition, although the lack of petrological features can make the classification of C1 material more difficult, recent studies and analysis of new meteorite fall and returned samples continue to emphasize the diversity of C1 materials.