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Rb-Sr and Sm-Nd isotopic variations in dissected crustal xenolithsThe effect of magma-xenolith interaction on the Rb-Sr and Sm-Nd isotopic systematics was investigated by studying the Rb-Sr and Sm-Nd variations in dissected crustal xenoliths sampled from different localities across Scotland. The Nd isotopic compositions were found to be virtually uniform across each xenolith, but significant variations were found in Rb, Sr, and REE concentrations, as well as in Rb/Sr and Sm/Nd ratios and Sr isotopic composition. Most of these variations appear to be inherited from the protolith, but, in one case, they have been modified by melt infiltration from the host magma. The results lend confidence to the interpretation of the isotopic and chemical compositions of xenoliths transported in basaltic magmas as reflecting their source regions, but they also highlight the potential problems of interpreting Sm-Nd model ages from metamorphic rocks.
Document ID
19930038727
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Lee, Der-Chuen
(NASA Headquarters Washington, DC United States)
Halliday, Alex N.
(Michigan Univ. Ann Arbor, United States)
Hunter, Robert H.
(Liverpool Univ. United Kingdom)
Holden, Peter
(California Univ. Los Angeles, United States)
Upton, Brian G. J.
(Edinburgh Univ. United Kingdom)
Date Acquired
August 16, 2013
Publication Date
January 1, 1993
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 57
Issue: 1
ISSN: 0016-7037
Subject Category
Geophysics
Accession Number
93A22724
Funding Number(s)
CONTRACT_GRANT: NSF EAR-87-20564
CONTRACT_GRANT: NAGW-176
CONTRACT_GRANT: NSF EAR-90-04133
CONTRACT_GRANT: NSF EAR-89-15986
CONTRACT_GRANT: NSF EAR-86-16061
Distribution Limits
Public
Copyright
Other

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