Survey of D-rich organic matters in NWA801 CR2 chondrite

摘要: Deuterium-rich organic matters have been reported in CR chondrites. The delta-D vaules of bulk CR chondrites are 644 per mill {1}. Insoluble organic matters (IOMs) in CR chondrites are enriched in D (delta-D of 3000 per mill in average), and the maximum D-rich domain of IOMs has a value of 19,400 per mill in delta-D {2}. The highly D enrichments are believed to have formed in molecular clouds or protoplanetaly disk. Hence, the H isotopic anomalies suggest that primitive organic matters are preserved in CR chondrites. In this study, we developed hydrogen isotopography to search for D-rich materials and to understand their in situ distribution in chondrite matrix.The sample used in this study is a polished thin section of NWA801 CR2 chondrite. Hydrogen isotope images (isotopography) were obtained by isotope microscope (Cameca ims-1270+ SCAPS) in Hokkaido University {3}. We used a large and intense …