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TitleTaconian obduction and Silurian exhumation of the Betts Cove Ophiolite, Canadian Appalachians
AuthorTremblay, A; Bedard, J H; Lauziere, K
SourceJournal of Geology v. 105, 1997 p. 701-716, https://doi.org/10.1086/515976 (Open Access)
Year1997
Alt SeriesGeological Survey of Canada, Contribution Series 1997059
PublisherUniversity of Chicago Press
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf
ProvinceNewfoundland and Labrador
NTS2C/12; 2C/13; 2E/04; 12H/09; 12H/16; 12I/01
AreaBetts Cove; Pointe Rousse; Flatwater Pond; Micmac Lake; Baie Verte
Lat/Long WENS -56.5000 -55.5000 50.2500 49.5000
Subjectstectonics; structural geology; obduction; igneous rocks; volcanic rocks; ophiolites; oceanic crust; deformation; structural features; structural interpretations; folding; faulting; tectonic evolution; Betts Cove Ophiolite; Betts Cove Complex; Snooks Arm Group; Cape St. John Group; Silurian; Ordovician; Paleozoic
Illustrationssketch maps; photographs; diagrams; stereonets
AbstractIn the Newfoundland Appalachians, the Betts Cove Complex and cover rocksof the Snooks Arm Group form a composite section of Ordovician marginal oceanic crust that is unconformably overlain by Silurian terrestrial sedimentary rocks and bimodal volcanics of the Cape St. John Group. Tectonic fabrics that characterize both the Ordovician and the Silurian rock sequences are subdivided into pre- to syn-obduction (Taconian) structures, Silurian extensional structures, and Acadian compressional structures. Pre-obduction structures consist of syn-oceanic normal faults in the Betts Cove ophiolite. Thrusting fabrics found along parts of the contact between the ophiolite and the Snooks Arm Group are attributed to the obduction of the oceanic crust over the Laurentian margin during the Taconian orogeny. Normal faults and shear zones of inferred Silurian age are preserved in the Snooks Arm Group and along the contact with the Cape St. John Group. These faults are contemporaneous with Silurian sedimentation and magmatism and are attributed to the exhumation of the oceanic crust. Southeast-verging reverse faults and folds that characterize the regional deformation in the Baie Verte peninsula postdate the exhumation and are attributed to compressive deformation related to the Devonian Acadian orogeny.
GEOSCAN ID208716