Cosmogenic and trapped noble gases in individual chondrules: Clues to chondrule formation
作者： J. P. Das , S. V. S. Murty
DOI: 10.1111/J.1945-5100.2009.TB01208.X
关键词: Astrobiology 、 Chondrite 、 Astrophysics 、 Enstatite 、 Chondrule 、 Parent body 、 Geology
摘要: We studied the elemental and isotopic abundances of noble gases (He, Ne, Ar in most cases, Kr, Xe also some cases) individual chondrules separated from six ordinary, two enstatite, carbonaceous chondrites. Most show detectable amounts trapped 20 Ne 36 Ar, ratio ( Ar/ Ne)t (from ordinary chondrites) suggests that HL Q are major components. A different trend between is observed for enstatite chondrites indicating a environment and/or mechanism their formation compared to found chondrule Dhajala chondrite (DH-11) shows presence solar-type gases, as suggested by ratio, Ne-isotopic composition, excess 4 He. Cosmic-ray exposure (CRE) ages similar host few higher CRE age host, suggesting precursors have received cosmic ray irradiation before accreting parent body. Among these chondrules, DH-11 (with solar gases) Murray (MRY-1) lower values 21 Ne/ 22 Ne)c, indicative SCR contribution. However, such evidences sporadic indicate event may erased records wind chondrules. These results support nebular formation.
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