Neutron Capture Effects in Yamato-74191 and Rare Gas Composition in Yamato-75258

• Main Authors: Nobuo Takaoka, Keisuke Nagao
• Format: Report
• Language: English
• Published: Department of Earth Sciences, Faculty of Science, Yamagata University 1980
• Subjects: Yamato; Memoirs of National Institute of Polar Research; Polar Research
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1101; http://id.nii.ac.jp/1291/00001101/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1101&item_no=1&attribute_id=18&file_no=1

Results are summarized of mass spectrometrical measurements of rare gases in the Yamato-74191 (L3) chondrite. The rare gas compositions in the Yamato-75258 amphoterite (type 6) were measured. Spallogenic gases dominate in He and Ne. Cosmic-ray irradiation and gas retention ages were tentatively calculated to be 12.4Ma and 30Ga, respectively. The concentration of trapped ^<132>(Xe) agrees with that inferred from the petrologic type.