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Rare earth element carriers in the Shergotty meteorite and implications for its chronologyThis paper reports on the results of ion-probe measurements of REE concentrations in individual grains of the Shergotty meteorite. The phases analyzed included whitlockite, apatite, baddeleyite, augite, pigeonite, maskelynite, and K-rich glass; the whitlockite and apatite phases were also analyzed for U. Results indicate that whitlockite contains the bulk of the REE in Shergotty, with no evidence for distinct light-REE patterns in texturally different whitlockites. The results on the evolution of the REE abundances in the Shergotty late-stage interstitial melt, inferred from the analysis of whitlockite, are consistent with closed system crystallization. No metasomatic alteration is required to explain the REE data. It is concluded that there is no compelling reason to attribute chronological significance to the Sm-Nd array, as was done by Jagoutz and Waenke (1986).
Document ID
19890026986
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Lundberg, Laura L.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Crozaz, Ghislaine
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Zinner, Ernst
(Washington University Saint Louis, MO, United States)
Mckay, Gordon
(NASA Johnson Space Center Houston, TX, United States)
Date Acquired
August 14, 2013
Publication Date
August 1, 1988
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 52
ISSN: 0016-7037
Subject Category
Lunar And Planetary Exploration
Accession Number
89A14357
Funding Number(s)
CONTRACT_GRANT: NSF EAR-84-15168
Distribution Limits
Public
Copyright
Other

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