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Al-26, Pu-244, Ti-50, REE, and trace element abundances in hibonite grains from CM and CV meteoritesHibonites from the CM meteorites Murchison, Murray, and Cold Bokkeveld, and hibonites and Ti-rich pyroxene from the CV chondrite Allende are studied. Electron microprobe measurements of major element concentrations and track and ion probe measurements of Mg and Ti isotopic ratios, rare earth elements (REEs), and trace element abundances are analyzed. Correlations between isotopic anomalies in Ti, Al-26, Pu-244, and Mg-26(asterisk) are examined. Ti isotopic anomalies are compared with REE and trace element abundance patterns. Reasons for the lack of Al-26 in the hibonites are investigated and discussed. It is observed that there is no correlation between the Ti isotopic compositions, and the presence of Mg-26(asterisk), Pu-244, and REE and trace element patterns in individual hibonite samples. The data reveal that hibonites are not interstellar dust grains but formed on a short time scale and in localized regions of the early solar system.
Document ID
19870049284
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Fahey, A. J.
(Physical Research Lab. Ahmedabad, India)
Mckeegan, K. D.
(Physical Research Lab. Ahmedabad, India)
Zinner, E.
(Washington University Saint Louis, MO, United States)
Goswami, J. N.
(Physical Research Laboratory Ahmedabad, India)
Date Acquired
August 13, 2013
Publication Date
February 1, 1987
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 51
ISSN: 0016-7037
Subject Category
Lunar And Planetary Exploration
Accession Number
87A36558
Funding Number(s)
CONTRACT_GRANT: NAG9-55
Distribution Limits
Public
Copyright
Other

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