Volatile-rich chondrules in the Allende meteorite

• Main Authors: Hiroshi Isobe, Masao Kitamura, Nobuo Morimoto
• Format: Report
• Language: English
• Published: Department of Geology and Mineralogy, Faculty of Science, Kyoto University 1986
• Subjects: Memoirs of National Institute of Polar Research; Polar Research
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1970; http://id.nii.ac.jp/1291/00001970/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1970&item_no=1&attribute_id=18&file_no=1

A new type of chondrules in the Allende meteorite is rich in volatile elements and shows porphyritic textures similar to terrestrial basalts. This unique type is termed Type V to supplement H. Y. McSWEEN'S (Geochim. Cosmochim. Acta, 41,1843,1977) classification of chondrules in carbonaceous chondrites. The Type V chondrules form a continuous trend with the Type I and II chondrules in the (Na+K)-(Al)-(Si) and (Na+K)-(Al+Ca)-(Mg+Fe) ternary systems. Type IV is plotted between Type V and CAI's. These compositional features of the different types of chondrules suggest that Type V was resulted from a fractionation process in the precusor materials of the Allende meteorite.