Abstract
The Mukundpura carbonaceous chondrite represents the negligible thermally affected with modest aqueous altered chondrite, providing a new unique opportunity to investigate the composition of the early solar system materials. We investigated cosmogenic records using radioactive and stable isotopes in Mukundpura. The cosmic ray exposure (CRE) age of Mukundpura is estimated to be 6.54 ± 1.34 Ma based on cosmogenic 21Ne by considering trapped noble gas as Q-gas. The exposure age determined from combination of radioactive isotope and neon yields a range between 5.9 and 6.5 Ma. The CRE age lies at the higher end of the CRE age distribution of the CM chondrite group, which is dominated by ages of 0.1–10 Ma. Noble gas isotope signature confirms the presence of multiple components, chondritic phase Q, HL from presolar grains and solar wind.
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