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TitleBetts Cove ophiolite and its cover rocks, Newfoundland
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorBédard, J H; Lauzière, K; Tremblay, A; Sangster, A; Douma, S L; Dec, T
SourceGeological Survey of Canada, Bulletin 550, 2000, 76 pages, Open Access logo Open Access
PublisherNatural Resources Canada
Mediapaper; on-line; digital
RelatedThis publication is related to the following publications
File formatpdf
ProvinceNewfoundland and Labrador
AreaBetts Cove; Snooks Arm; Till Cove
Lat/Long WENS-56.0000 -55.5000 50.0000 49.7500
Subjectsstructural geology; stratigraphy; geochemistry; tectonics; metallic minerals; mineralogy; igneous and metamorphic petrology; lithology; stratigraphic analyses; stratigraphic correlations; igneous rocks; volcanic rocks; plutonic rocks; dykes; lavas; sedimentary rocks; turbidites; tuffs; ophiolites; porphyries; granodiorites; granites; sills; deformation; obduction; folds; faults, thrust; structural features; petrogenesis; metamorphism; tectonic models; mineral deposits; mineral occurrences; copper; gold; vein deposits; mineralization; mineralogical analyses; geochemical analyses; field relations; major element analyses; trace element analyses; Betts Cove ophiolite; Snooks Arm Group; Round Harbour Formation; Balsam Bud Cove Formation; Venam's Bight Formation; Bobby Cove Formation; Scrape Point Formation; Mount Misery Formation; Betts Head Formation; Cape St. John Group; debrites; Silurian; Ordovician
Illustrationssketch maps; photomicrographs; photographs; geochemical analyses
ProgramCanada-Newfoundland Cooperation Agreement on Mineral Development, 1990-1994
ProgramCanada-Newfoundland Cooperation Agreement on Mineral Development, 1994-1995
Released2000 08 01; 2013 09 10
AbstractThe Betts Cove ophiolite formed through seafloor spreading in an Ordovician fore-arc marginal basin, since dykes of the sheeted dyke complex, the lower lavas (the Betts Head Formation), and the cumulate rocks all have boninitic affinities; and recent boninitic lavas are only found in fore-arc environments. Synmagmatic extensional faults dissect the lavas and dykes into horst-and-graben structures. The faults localized hydrothermal flow and controlled sulphide deposition. The lowermost unit of the overlying Snooks Arm Group, the Mount Misery Formation, is composed of arc tholeiitic rocks. They are overlain by thick sequences of evolved tholeiitic rocks (Scrape Point Volcanic Member; Venam's Bight, Round Harbour formations) and feeder sills, calc-alkaline pyroclastic rocks (lower Bobby Cove, lower Balsam Bud Cove formations), and sedimentary rocks derived through erosion of the different types of volcanic rocks (Scrape Point sedimentary rocks, upper Bobby Cove, upper Balsam Bud Cove formations). During obduction, the ophiolite and its cover rocks were thrust above a talc-serpentinite unit. Chloritized synoceanic faults formed during seafloor spreading were reactivated at this time.

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