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Petrogenesis of the peralkaline Flowers River Igneous Suite and its significance to the development of the southern Nain Batholith

Published online by Cambridge University Press:  20 May 2021

Taylor A. Ducharme Open the ORCID record for Taylor A. Ducharme [Opens in a new window] ,
Christopher R.M. McFarlane ,
Deanne van Rooyen  and
David Corrigan
Taylor A. Ducharme*
Affiliation:
Department of Earth Sciences, University of New Brunswick, Fredericton, NB, E3B 5A3, Canada
Christopher R.M. McFarlane
Affiliation:
Department of Earth Sciences, University of New Brunswick, Fredericton, NB, E3B 5A3, Canada
Deanne van Rooyen
Affiliation:
Department of Mathematics, Physics, and Geology, Cape Breton University, Sydney, NS, B1P 6L2, Canada
David Corrigan
Affiliation:
Geological Survey of Canada, Ottawa, ON, K1A 0E8, Canada
*
Author for correspondence: Taylor A. Ducharme, Email: taylor.ducharme@unb.ca
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Abstract

The Flowers River Igneous Suite of north-central Labrador comprises several discrete peralkaline granite ring intrusions and their coeval volcanic succession. The Flowers River Granite was emplaced into Mesoproterozoic-age anorthosite–mangerite–charnockite–granite (AMCG) -affinity rocks at the southernmost extent of the Nain Plutonic Suite coastal lineament batholith. New U–Pb zircon geochronology is presented to clarify the timing and relationships among the igneous associations exposed in the region. Fayalite-bearing AMCG granitoids in the region record ages of 1290 ± 3 Ma, whereas the Flowers River Granite yields an age of 1281 ± 3 Ma. Volcanism occurred in three discrete events, two of which coincided with emplacement of the AMCG and Flowers River suites, respectively. Shared geochemical affinities suggest that each generation of volcanic rocks was derived from its coeval intrusive suite. The third volcanic event occurred at 1271 ± 3 Ma, and its products bear a broad geochemical resemblance to the second phase of volcanism. The surrounding AMCG-affinity ferrodiorites and fayalite-bearing granitoids display moderately enriched major- and trace-element signatures relative to equivalent lithologies found elsewhere in the Nain Plutonic Suite. Trace-element compositions also support a relationship between the Flowers River Granite and its AMCG-affinity host rocks, most likely via delayed partial melting of residual parental material in the lower crust. Enrichment manifested only in the southernmost part of the Nain Plutonic Suite as a result of its relative proximity to multiple Palaeoproterozoic tectonic boundaries. Repeated exposure to subduction-derived metasomatic fluids created a persistent region of enrichment in the underlying lithospheric mantle that was tapped during later melt generation, producing multiple successive moderately to strongly enriched magmatic episodes.

Keywords

Peralkaline graniteNain Plutonic SuiteAMCG magmatismU–Pb zircon geochronologyProterozoic magmatism
Type
Original Article
Information
Geological Magazine , Volume 158 , Issue 11 , November 2021 , pp. 1911 - 1936
Copyright
© The Author(s), 2021. Published by Cambridge University Press

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