Sr, Nd, and Pb isotopes in Proterozoic intrusives astride the Grenville Front in Labrador - Implications for crustal contamination and basement mapping

Trace 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 investig...

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Bibliographic Details
Main Authors: Ashwal, L. D., Wooden, J. L., Emslie, R. F.
Format: Other/Unknown Material
Language:unknown
Published: 1986
Subjects:
46
Canada
Mealy Mountains
North Atlantic
Online Access:http://ntrs.nasa.gov/search.jsp?R=19870043252
id ftnasantrs:oai:casi.ntrs.nasa.gov:19870043252
record_format openpolar
spelling ftnasantrs:oai:casi.ntrs.nasa.gov:19870043252 2023-05-15T17:32:28+02:00 Sr, Nd, and Pb isotopes in Proterozoic intrusives astride the Grenville Front in Labrador - Implications for crustal contamination and basement mapping Ashwal, L. D. Wooden, J. L. Emslie, R. F. Unclassified, Unlimited, Publicly available Dec 1, 1986 http://ntrs.nasa.gov/search.jsp?R=19870043252 unknown http://ntrs.nasa.gov/search.jsp?R=19870043252 Accession ID: 87A30526 Copyright Other Sources 46 Geochimica et Cosmochimica Acta; 50; 2571-258 1986 ftnasantrs 2012-02-15T17:11:42Z Trace 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. Other/Unknown Material North Atlantic NASA Technical Reports Server (NTRS) Canada Mealy Mountains ENVELOPE(-59.465,-59.465,53.383,53.383)
institution Open Polar
collection NASA Technical Reports Server (NTRS)
op_collection_id ftnasantrs
language unknown
topic 46
spellingShingle 46
Ashwal, L. D.
Wooden, J. L.
Emslie, R. F.
Sr, Nd, and Pb isotopes in Proterozoic intrusives astride the Grenville Front in Labrador - Implications for crustal contamination and basement mapping
topic_facet 46
description Trace 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.
format Other/Unknown Material
author Ashwal, L. D.
Wooden, J. L.
Emslie, R. F.
author_facet Ashwal, L. D.
Wooden, J. L.
Emslie, R. F.
author_sort Ashwal, L. D.
title Sr, Nd, and Pb isotopes in Proterozoic intrusives astride the Grenville Front in Labrador - Implications for crustal contamination and basement mapping
title_short Sr, Nd, and Pb isotopes in Proterozoic intrusives astride the Grenville Front in Labrador - Implications for crustal contamination and basement mapping
title_full Sr, Nd, and Pb isotopes in Proterozoic intrusives astride the Grenville Front in Labrador - Implications for crustal contamination and basement mapping
title_fullStr Sr, Nd, and Pb isotopes in Proterozoic intrusives astride the Grenville Front in Labrador - Implications for crustal contamination and basement mapping
title_full_unstemmed Sr, Nd, and Pb isotopes in Proterozoic intrusives astride the Grenville Front in Labrador - Implications for crustal contamination and basement mapping
title_sort sr, nd, and pb isotopes in proterozoic intrusives astride the grenville front in labrador - implications for crustal contamination and basement mapping
publishDate 1986
url http://ntrs.nasa.gov/search.jsp?R=19870043252
op_coverage Unclassified, Unlimited, Publicly available
long_lat ENVELOPE(-59.465,-59.465,53.383,53.383)
geographic Canada
Mealy Mountains
geographic_facet Canada
Mealy Mountains
genre North Atlantic
genre_facet North Atlantic
op_source Other Sources
op_relation http://ntrs.nasa.gov/search.jsp?R=19870043252
Accession ID: 87A30526
op_rights Copyright
_version_ 1766130610422677504

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