摘要：Abstract The Sulagiri meteorite fell in India on 12 September 2008, LL6 chondrite class is the largest among all the Indian meteorites. Isotopic compositions of noble gases (He, Ne, Ar, Kr and Xe) and nitrogen in the Sulagiri meteorite and cosmic ray exposure history are discussed. Low cosmogenic (22Ne/21Ne)c ratio is consistent with irradiation in a large body. Cosmogenic noble gases indicate that Sulagiri has a 4π cosmic-ray exposure (CRE) age of 27.9 ± 3.4 Ma and is a member of the peak of CRE age distribution of LL chondrites. Radiogenic 4He and 40Ar concentrations in Sulagiri yields the radiogenic ages as 2.29 and 4.56 Ga, indicating the loss of He from the meteorite. Xenon and krypton are mixture of Q and spallogenic components. Graphical abstract Display Omitted Highlights • Noble gas and nitrogen isotopes studied in Sulagiri. • Cosmic ray exposure age of Sulagiri chondrite is 27.9 ± 3.4 Ma. • Loss of helium from the meteorite indicates recent impact event. • Presence of neutron produced products implies large preatmospheric size.
关键词：KeywordsenNoble gasesNitrogenCosmic ray exposure ageMeteoriteTrapped gases
