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Geosciences 2013, 3(3), 448-465; doi:10.3390/geosciences3030448

Nd Isotope Mapping of Crustal Terranes in the Parent-Clova Area, Quebec: Implications for the Evolution of the Laurentian Margin in the Central Grenville Province

School of Geography and Earth Sciences, McMaster University, 1280 Main St W, Hamilton L8S4K1, Canada
Author to whom correspondence should be addressed.
Received: 16 May 2013 / Revised: 4 July 2013 / Accepted: 10 July 2013 / Published: 18 July 2013
(This article belongs to the Special Issue Continental Accretion and Evolution)
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Over 100 new Nd isotope analyses for the central Grenville Province in the Parent-Clova region of Quebec help fill a major gap in understanding the crustal accretion history of the province. Nd model ages show that the Parent-Clova region consists of three crustal blocks: the Archean parautochthon in the north; a central block with mixed ages interpreted as an ensialic arc; and a southerly block forming an extension of the Mesoproterozoic Quebecia arc terrane. The Allochthon Boundary Thrust is believed to define the edge of the Archean parautochthon, which is bordered for a distance of 300 km by the ensialic arc block, within which model ages decrease consistently away from the craton. A similar negative correlation between Nd model age and distance from the craton is seen in published data for the Algonquin terrane in Ontario, but with a lower range of model ages. These comparisons show that in the Parent-Clova region, a Mesoproterozoic ensialic arc was established directly on the Archean margin, but further west, the Mesoproterozoic arc was built on a younger margin consisting of accreted Palaeoproterozoic arc crust. The use of large Nd data sets allows these distinct regional growth patterns to become clear and, hence, allows an understanding of Mesoproterozoic crustal evolution in the province as a whole. View Full-Text
Keywords: Grenville Province; Nd isotopes; model ages; ensialic arc Grenville Province; Nd isotopes; model ages; ensialic arc

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Zelek, M.; Dickin, A. Nd Isotope Mapping of Crustal Terranes in the Parent-Clova Area, Quebec: Implications for the Evolution of the Laurentian Margin in the Central Grenville Province. Geosciences 2013, 3, 448-465.

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