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Sr, Nd, and Pb isotopes in Proterozoic intrusives astride the Grenville Front in Labrador - Implications for crustal contamination and basement mappingTrace element and Pb, Sr, and Nd isotopic compositions of anorthosites and related rocks, and of younger mafic dikes from Harp Lake and Mealy Mountains in Labrador, Canada are estimated and compared. The effects of crustal component contaminants on the isotopic compositions of the dikes are investigated. The correlation between the isotopic data and the crustal contamination model is studied. It is observed that for Harp Lake the initial Sr ratios are higher and the Nd values are lower than Mealy samples, and the data do not correspond to the crustal contamination model; however, the Pb isotope data favor a crustal contamination model. It is noted that the Labrador segment of the Grenville Front appears to coincide with the southern margin of the Archean North Atlantic craton, and may represent a pre mid-Proterozoic suture.
Document ID
19870043252
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Ashwal, L. D.
(NASA Lunar and Planetary Institute Houston, TX, United States)
Wooden, J. L.
(USGS Menlo Park, CA, United States)
Emslie, R. F.
(Geological Survey of Canada Ottawa, United States)
Date Acquired
August 13, 2013
Publication Date
December 1, 1986
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 50
ISSN: 0016-7037
Subject Category
Geophysics
Accession Number
87A30526
Funding Number(s)
CONTRACT_GRANT: NASW-4066
Distribution Limits
Public
Copyright
Other

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