Research paperGeochemistry of pre-Taconian mafic volcanism in the Humber Zone of the northern Appalachians, Québec, Canada
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Along-strike variations in the deformed Laurentian margin in the Northern Appalachians: Role of inherited margin geometry and colliding arcs
2022, Earth-Science ReviewsCitation Excerpt :The Maquerau-Mictaw Inlier (Fig. 1b) on the Gaspé Peninsula exposes sandstone, conglomerate, and volcanic units, deformed and metamorphosed to greenschist facies, inferred to represent an Ediacaran or Cambrian (DeBroucker, 1987) Laurentian synrift succession (Allen et al., 2010). Farther west, the Schickshock Group, consisting of Neoproterozoic to Cambrian alkaline to tholeiitic metabasalt (Camiré et al., 1995) interleaved with lesser arkose and minor conglomerate, represents earliest rift-related units (Kumarapeli et al., 1989; Tremblay and Pinet, 2016). Within the Sutton-Notre-Dame mountains in southern Québec and Vermont, green metawacke and phyllite of the Pinnacle Formation overlie the rift-related Tibbit Hill volcanic rocks (554 +/-4 Ma; Kumarapeli et al., 1989) and are continuous with the base of the cover succession of the Green Mountain massif (GMM; Fig. 1b) (Dorsey et al., 1983; Dowling, 1986).
Early subduction dynamics recorded by the metamorphic sole of the Mt. Albert ophiolitic complex (Gaspé Quebec)
2019, LithosCitation Excerpt :The Mont Albert ophiolite and its sole overlay unconformably the Schick-Schock volcanic flows and pyroclastics metamorphosed to lower greenschist facies that appear in the internal Humber zone in recent publications (reviewed in Tremblay and Pinet, 2016), although Lux (1986) suggested they are part of the Dunnage zone. These volcanics are subalkaline tholeiitic basalts of N-MORB-type, with geochemical evidence in favour of their eruption in the Humber Zone during the rifting event which led to the opening of the Iapetus ocean (Camiré et al., 1995). The Mont Albert ophiolitic complex is separated from the upper Ordovician to Devonian sediments and volcanics of the Gaspé Belt to the south by a fault zone (Schick-Schock South Fault, Fig. 2) part of the Baie Verte-Brompton Line.
Water mass circulation and weathering inputs in the Labrador Sea based on coupled Hf–Nd isotope compositions and rare earth element distributions
2017, Geochimica et Cosmochimica ActaLate Neoproterozoic to Permian tectonic evolution of the Quebec Appalachians, Canada
2016, Earth-Science ReviewsCitation Excerpt :In the north, the internal Humber Zone, as defined by Slivitzky et al. (1991), consists of two fault-bounded tectonostratigraphic units, the Mont Logan nappe and the Lac Cascapédia window, which are structurally overlain by the metamorphic sole of the Amphibolite du Diable and the Mont Albert ultramafic Complex (Beaudin, 1980), both belonging to the Dunnage Zone. The Mont Logan nappe is composed of Neoproterozoic to Cambrian rocks of the Shickshock Group, which consists mainly of subalkaline to tholeiitic metabasalts (Camiré et al., 1995) and minor metasedimentary rocks, whereas the Lac Cascapédia window is made up of greenschist-facies mudrocks and siltstones. In the Mont Logan nappe, regional metamorphism varies from greenschist facies in the north to amphibolite facies in the south, in the vicinity of the Shickshock-Sud Fault (Fig. 3; Camiré et al., 1995).
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2014, Earth and Planetary Science LettersContrasting modes of supercontinent formation and the conundrum of Pangea
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