Structural analysis of the Creignish Hills Mylonite Zone, Cape Breton Island, Nova Scotia: implications for Neoproterozoic core complex development along the northern Gondwanan margin?

Wessel, Zachary R.; Nance, R. Damian; Keppie, J. Duncan; Murphy, J. Brendan

doi:10.1016/j.jog.2004.11.002

Cited by 2 publications

(3 citation statements)

References 34 publications

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“…737 Ma) discordant zircon grains, but Keppie et al (2000) inferred a Silurian age, based on muscovite plateau ages in the surrounding host rocks, especially an age of 441 Ma from what they interpreted to be the contact metamorphic aureole adjacent to the granite. Keppie et al (2000) and Wessel et al (2005) showed the Skye Mountain granite and gabbro-diorite as contiguous bodies on their maps, whereas previous maps (White et al 1990;Horton 1994) showed them as separate bodies. Horton (1994) interpreted them to be unrelated based on their very different petrographic and chemical characteristics.…”

mentioning

confidence: 84%

“…Keppie (1993), Keppie et al (1998a), and Wessel et al (2005) interpreted the presence of a folded shear zone between the low-and high-grade rocks in the Skye Mountain area of the Creignish Hills. They postulated that this shear zone repeatedly intersects the present erosion surface, implying that it is a low-angle tectonic boundary in which the high-grade rocks occur in structural domes.…”

Section: Bras D'or Metamorphic Suite In the Creignish Hills -North Momentioning

confidence: 99%

“…1) consist mostly of Neoproterozoic metasedimentary and plutonic rocks typical of the Bras d'Or terrane of Barr and Raeside (1989) and Raeside and Barr (1990). These areas have been mapped and studied by numerous workers over the years (e.g., Kelly 1967;Milligan 1970;White et al 1990;Campbell 1990;Justino 1991;Lynch and Brisson 1996;Keppie et al 1998a;White et al 2003;Wessel et al 2005), and the resulting interpretations are varied, hampered by complex field relations and limited age constraints. White and Boehner (2008) compiled and evaluated existing data to produce a revised 1:50 000-scale geological map of the Whycocomagh NTS sheet, and Swanton et al (2010) extended the mapping to the northeast to include metamorphic and plutonic rocks in the Lewis Mountain-Aberdeen Ridge area (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Field relations, age, and tectonic setting of metamorphic and plutonic rocks in the Creignish Hills – North Mountain area, southwestern Cape Breton Island, Nova Scotia, Canada

White

Barr²,

Davis³

et al. 2016

atgeol

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The Creignish Hills and North Mountain areas of southwestern Cape Breton Island consist mostly of Neoproterozoic rocks typical of the Ganderian Bras d'Or terrane. U-Pb ages presented here for detrital zircon in the Blues Brook Formation of the Creignish Hills confirm a depositional age no greater than about 600 Ma. Although it is possible that some components of the formation are much older, similarities in rock types and field relations suggest that this is not the case. It is likely that the equivalent Malagawatch Formation of the North Mountain area, as well as high-grade metasedimentary rocks of the Melford Formation and Chuggin Road complex in the Creignish Hills and Lime Hill gneiss complex in the North Mountain area, represent the same or stratigraphically equivalent units as the Blues Brook Formation. The minimum ages of all of these units are constrained by cross-cutting syn-and post-tectonic plutons with ages mostly between 565 and 550 Ma, indicating that sediments were deposited, regionally metamorphosed, deformed, and intruded by plutons in less than 40-50 million years. The assemblage of pelitic, psammitic, and carbonate rocks indicates that a passive margin in a tropical climate was quickly changed to an active Andean-type continental margin in which voluminous calcalkaline dioritic to granitic plutons were emplaced. This sedimentary and tectonic history is characteristic of the Bras d'Or terrane and is shared by its likely correlative, the Brookville terrane in southern New Brunswick. rÉsUMÉ Les secteurs des collines Creignish et du mont North dans le sud-ouest de l'île du Cap-Breton sont principalement constitués de roches néoprotérozoïques typiques du terrane de Ganderian Bras d'Or. Les âges U-Pb sur zircon détritique de la formation de Blues Brook des collines Creignish présentés ici confirment une sédimentation survenue il y a au plus 600 Ma environ. Même s'il est possible que certains éléments de la formation soient beaucoup plus âgés, les similarités des lithotypes et les observations sur le terrain laissent supposer que ce n' est pas le cas. Il est probable que la formation équivalente de Malagawatch dans le secteur du mont North de même que les roches métasédimentaires à forte teneur de la formation de Melford et du complexe du chemin Chuggin dans les collines Creignish et le complexe de gneiss de la colline Lime dans le secteur du mont North représentent les mêmes unités que la formation de Blues Brook ou des unités stratigraphiquement équivalentes. Les âges minimaux de toutes ces unités sont limités par les plutons Field relations, age, and tectonic setting of metamorphic and plutonic rocks in the creignish Hills -north Mountain area, southwestern cape breton island, nova scotia, canada

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confidence: 84%

Section: Bras D'or Metamorphic Suite In the Creignish Hills -North Momentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Field relations, age, and tectonic setting of metamorphic and plutonic rocks in the Creignish Hills – North Mountain area, southwestern Cape Breton Island, Nova Scotia, Canada

White

Barr²,

Davis³

et al. 2016

atgeol

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Greater Avalonia—latest Ediacaran–Ordovician “peribaltic” terrane bounded by continental margin prisms (“Ganderia,” Harlech Dome, Meguma): Review, tectonic implications, and paleogeography

Landing

Keppie

et al. 2022

Earth-Science Reviews

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Structural analysis of the Creignish Hills Mylonite Zone, Cape Breton Island, Nova Scotia: implications for Neoproterozoic core complex development along the northern Gondwanan margin?

Cited by 2 publications

References 34 publications

Field relations, age, and tectonic setting of metamorphic and plutonic rocks in the Creignish Hills – North Mountain area, southwestern Cape Breton Island, Nova Scotia, Canada

Field relations, age, and tectonic setting of metamorphic and plutonic rocks in the Creignish Hills – North Mountain area, southwestern Cape Breton Island, Nova Scotia, Canada

Greater Avalonia—latest Ediacaran–Ordovician “peribaltic” terrane bounded by continental margin prisms (“Ganderia,” Harlech Dome, Meguma): Review, tectonic implications, and paleogeography

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