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

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

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50.2571a&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 50, Dec. 1986, p. 2571-2585.

Computer Science

12

Earth Crust, Igneous Rocks, Lead Isotopes, Massifs, Neodymium Isotopes, Strontium Isotopes, Anorthosite, Earth Mantle, Labrador, Olivine, Trace Elements

Scientific paper

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.

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