REE Abundances in the Whole Rock and Mineral Separates of the Allan Hills-765 Meteorite

• Main Authors: Noboru Nakamura, Akimasa Masuda
• Format: Report
• Language: English
• Published: Department of Earth Sciences, Faculty of Science, Kobe University 1980
• Subjects: Allan Hills; Memoirs of National Institute of Polar Research; Polar Research
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1096; http://id.nii.ac.jp/1291/00001096/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1096&item_no=1&attribute_id=18&file_no=1

The rare earth elements (REE) Ba and Sr abundances in the whole rock and mineral separates of the Allan Hills-765 meteorite and in the whole rock of the Juvinas meteorite have been determined by the mass spectrometric isotope dilution method. The REE pattern of the whole rock of the Allan Hills meteorite is similar to that of the Juvinas meteorite but is different in presence of a significantly large (∿+50%) Ce anomaly. The hand-picked pyroxenes black clast show different REE patterns with different extents of Ce anomalies (-40∿+240%). On the other hand, plagioclase shows rather minor (∿+10%) Ce irregularity. REE patterns for estimated melts in equilibrium with the minerals suggest that different pyroxenes have not been in equilibrium with each other and with plagioclase.