NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
The evolution of complex type B Allende inclusion - An ion microprobe trace element studyResults are presented of a detailed trace-element and isotopic analyses of the constituent phases in each of the major textural parts (mantle, core, and islands) of a Type B refractory inclusion, the USNM 5241 inclusion from Allende, first described by El Goresy et al. (1985). The REE data on 5241 were found to be largely consistent with a model in which the mantle and the core of 5241 formed sequentially out of a single melt by fractional crystallization. The numerical models of REE evolution in the 5241 melt, especially that of Eu, require that a significant mass of spinel-free island material was assimilated into the evolving melt during the last half of the solidification history of 5241. The trace element results pbtained thus strongly support the interpretation of El Goresy et al. (1985) that the spinel-free islands in the 5241 are trapped xenoliths.
Document ID
19890066931
Document Type
Reprint (Version printed in journal)
Authors
Macpherson, Glenn J. (National Museum of Natural History Washington, DC, United States)
Crozaz, Ghislaine (National Museum of Natural History Washington, DC, United States)
Lundberg, Laura L. (Washington University Saint Louis, MO, United States)
Date Acquired
August 14, 2013
Publication Date
September 1, 1989
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 53
ISSN: 0016-7037
Subject Category
LUNAR AND PLANETARY EXPLORATION
Funding Number(s)
CONTRACT_GRANT: NAG9-55
CONTRACT_GRANT: NSF EAR-87-19528
CONTRACT_GRANT: NAG9-230
Distribution Limits
Public
Copyright
Other