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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Canada
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Eastern Canada
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Newfoundland and Labrador
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Newfoundland
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Baie Verte Peninsula (14)
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Humber Arm Allochthon (2)
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Primary terms
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Canada
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Newfoundland and Labrador
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Baie Verte Peninsula (14)
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Quebec
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Thetford Mines (1)
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carbon
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ultramafics
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harzburgite (2)
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metals
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metamorphic rocks
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North America
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Appalachians
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orogeny (5)
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paleogeography (2)
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Paleozoic
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Baie Verte Peninsula
Dissolution-reprecipitation vs. solid-state diffusion in electrum: Examples from metamorphosed Au-bearing, volcanogenic massive sulfide (VMS) deposits
Predictive geologic mapping from geophysical data using self-organizing maps: A case study from Baie Verte, Newfoundland, Canada
Volcanic and Structural Reconstruction of the Deformed and Metamorphosed Ming Volcanogenic Massive Sulfide Deposit, Canada: Implications for Ore Zone Geometry and Metal Distribution
Evidence for Syngenetic Precious Metal Enrichment in an Appalachian Volcanogenic Massive Sulfide System: The 1806 Zone, Ming Mine, Newfoundland, Canada
CHROMITITE AND PLATINUM-GROUP-ELEMENT MINERALIZATION AT MIDDLE ARM BROOK, CENTRAL ADVOCATE OPHIOLITE COMPLEX, BAIE VERTE PENINSULA, NEWFOUNDLAND, CANADA
The Advocate ophiolite mantle, Baie Verte, Newfoundland: regional correlations and evidence for metasomatism Geological Survey of Canada, Earth Sciences Sector, Contribution 20090211.
The Taconic orogeny in Newfoundland consisted of three accretionary events (Taconic 1, 2, and 3). Taconic 1 is represented by ca. 495 Ma, west-directed obduction of the infant-arc Lushs Bight oceanic tract (510–501 Ma) onto the peri-Laurentian Dashwoods microcontinent. Subduction is inferred to have initiated at a spreading center abandoned during an inboard ridge jump responsible for separation of Dash-woods from Laurentia and opening of the Humber seaway. Clogging of the subduction zone by Dashwoods forced subduction to step back into the Humber seaway. Inception of the new subduction zone led to formation of the ca. 490 Ma Baie Verte oceanic tract. Closure of the Humber seaway formed the Notre Dame arc (489–477 Ma) built on Dashwoods and the coeval Snooks Arm arc built on the Baie Verte oceanic tract. Sea-way closure led to collision (Taconic 2) between the arcs and Laurentia, which caused significant shortening of the Notre Dame arc. After a magmatic gap of 7–10 m.y., the Notre Dame arc records a voluminous flare-up of predominantly tonalite magmatism (464–459 Ma) during the waning stages of Taconic 2. Magmatism overlaps with deformation and includes both arc and non-arc-like tonalite. This flare-up was related to break-off of the oceanic lithosphere of the downgoing slab. The rapidly upwelling asthenosphere that replaced the broken-off slab induced melting in the subarc mantle and arc infrastructure. Taconic 3 is represented by 455–450 Ma accretion of a peri-Laurentian arc that had formed after the ca. 480 Ma initiation of west-directed subduction in the Iapetus Ocean outboard of the Dashwoods microcontinent.