K-Ar Age of Yamato Meteorite, Yamato-74190-01(L)

• Main Authors: Akeji Kamaguchi, Jun Okano
• Format: Report
• Language: English
• Published: Institute of Geological Sciences, College of General Education, Osaka University 1978
• Subjects: Yamato; Memoirs of National Institute of Polar Research; Polar Research
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=891; http://id.nii.ac.jp/1291/00000891/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=891&item_no=1&attribute_id=18&file_no=1

Preliminary measurements have been carried out on the isotopic compositions and contents of helium, neon and argon in Yamato-74190-01 (L). K-Ar age and exposure ages on the meteorite have been calculated as follows : K-Ar age (∿2.1 b. y.), exposure ages (24 and 22 m. y. in terms of ^3(He) and ^<21>(Ne) contents respectively). From the isotopic correlation diagram for neon and the isotopic ratio, ^<36>(Ar)/^<38>(Ar), it has been suggested that this meteorite contains almost the same quantity of trapped rare gases as cosmogenic ones.