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Generation of abnormal trace element abundances in Antarctic eucrites by weathering processesData were obtained on the trace- and major-element compositions of 16 Antarctic abnormal eucrites, many of which exhibiting positive (but sometimes negative) Ce anomalies, positive Eu anomalies, and low abundances of the remainder of the REEs. The results of data analysis suggest that the unusual REE patterns of abnormal Antarctic eucrites arise from weathering effects generated in or on the Antarctic ice. The suggested scenario involves the formation of melt water and its equilibration with the atmosphere, promoting the dissolution of REE-rich phosphates and the oxidation of Ce. As a result, tetravalent Ce is fractionated from the trivalent REE in solution.
Document ID
19910040096
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Mittlefehldt, David W.
(Lockheed Engineering and Sciences Co. Houston, TX, United States)
Lindstrom, Marilyn M.
(NASA Johnson Space Center Houston, TX, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1991
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 55
ISSN: 0016-7037
Subject Category
Lunar And Planetary Exploration
Accession Number
91A24719
Distribution Limits
Public
Copyright
Other

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