Magnetic properties of Ni-rich iron meteorites

• Main Authors: Takesi Nagata, Jacques A. Danon, Minoru Funaki
• Format: Report
• Language: English
• Published: National Institute of Polar Research 1987
• Subjects: Yamato; Memoirs of National Institute of Polar Research; Polar Research
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2139; http://id.nii.ac.jp/1291/00002139/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2139&item_no=1&attribute_id=18&file_no=1

6 Ni-rich ataxites (25.6-35.5 wt% in Ni-content) are magnetically analyzed. These Ni-rich ataxites can be classified into 3 groups on the basis of the structure consisting of the major Fe-Ni phases; i. e., (1) ordinary taenite phase (ferromagnetic and paramagnetic γ-phases) only, (Yamato-791694 and the Lime Creek), (2) γ-phase plus tetrataenite (γ'-phase), (the Santa Catharina), and (3) γ-phase plus γ'-phase plus martensitic Fe-Ni metal (α_2-phase), (the Twin City and the San Cristobal). The Tishomingo Ni-rich ataxite has an anomalous structure, which may belong to either group (2) or group (3). Taenite lamellae of 2 octahedrites (the Toluca and the Itutinga) are also magnetically analyzed. These taenite lamellae have the structure of group (2).