37 The Northern Appalachians: What Have We Learned in the Past 40 Years? A Symposium in Honor of J. Christopher Hepburn (Posters)
Tuesday, 19 March 2013
8:00 AM - 12:00 PM
Grand Ballroom South
ACADIAN OROGENESIS IN CENTRAL NEWFOUNDLAND
Paper number: 37-5
Program: Symposia Sessions
Time: 8:00 AM – 12:00 PM
Authors
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Pablo Valverde-Vaquero Presenting AuthorInstituto Geológico y Minero de España (IGME), Tres Cantos (Madrid), N/A
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Cees R. van StaalGeological Survey of Canada, Vancouver, BC
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Greg DunningMemorial University of Newfoundland (MUN), St. John's, NF
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V. McNicollGeol Survey of Canada, Ottawa, ON
Abstract
Early Devonian orogenic activity (Acadian sensu stricto) in the Newfoundland Appalachians produced significant metamorphism and plutonism in the southern and eastern parts of the Central Mobile Belt (Gander Zone and Exploits Subzone). This is marked by the formation of the Meelpaeg metamorphic nappe. U-Pb and Ar-Ar dating in central Newfoundland have revealed that the Meelpaeg Subzone (Gander+Exploits) was part of the Acadian high-grade infrastructure, while the nearby Mount Cormack metamorphic complex was in the superstructure and escaped Siluro-Devonian overprint. Thus, the Acadian event appears to be the result of the formation of this “hot-nappe” at 420-411 Ma, and its final west-directed thrusting at ca. 404-400 Ma.