Abstracts for fall meeting of the Japanese Society for Planetary Science
Abstracts 2004 Fall Meeting of the Japanese Society for Planetary Sciences
Session ID : 402
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Host: The Japanese Society for Planetary Sciences: Local Organizing Committee for 2004 Fall Meeting

Oral session 4: Oct. 14, 14:30-15:30
Contemporaneous chondrule formation: 26Al ages of chondrules in the most primitive carbonaceous chondrite
*Erika Kurahashi, Noriko Kita, Hiroko Nagahara, Yuichi Morishita
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Abstract
26Al ages of 17 chondrules from the least equilibrated CO3.0 Yamato-81020 were analyzed. The chondrule formation ages show 1.3 to 2.4 Myr for ferromagnesian chondrules and 2.9 Myr for Al-rich chondrules after CAIs formations, assuming 26Al was homogeneously distributed in the early solar nebula. The forming period of ferromagnesian chondrules in carbonaceous chondrites (CC) clearly consists with those in ordinary chondrites (OC), 1.0-2.5 Myr after CAIs. Thus, ferromagnesian chondrules in CC formed contemporaneously with ferromagnesian chondrules in OC.
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© 2004 The Japanese Society for Planetary Science
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