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4-D Framework of Continental Crust

GSA Memoirs

4-D Framework of Continental Crust

Author(s)

Geological Society of America

Volume

200

DOI:

https://doi.org/10.1130/MEM200

Copyright:

Geological Society of America

ISBN print:

9780813712000

Publication date:

January 01, 2007

Book Chapter

The Notre Dame arc and the Taconic orogeny in Newfoundland

Author(s)

C.R. van Staal

1Geological Survey of Canada, NRCan, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada, and Department of Earth Sciences, University of Ottawa, and Ottawa-Carleton Geoscience Centre, 140 Louis Pasteur, Ottawa, Ontario K1N 6N5, Canada

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J.B. Whalen

2Geological Survey of Canada, NRCan, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada

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V.J. McNicoll

2Geological Survey of Canada, NRCan, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada

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S. Pehrsson

2Geological Survey of Canada, NRCan, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada

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C.J. Lissenberg

C.J. Lissenberg

3Department of Earth Sciences, University of Ottawa, and Ottawa-Carleton Geoscience Centre, 140 Louis Pasteur, Ottawa, Ontario K1N 6N5, Canada

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A. Zagorevski

4Geological Survey of Canada, NRCan, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada, and Department of Earth Sciences, University of Ottawa, and Ottawa-Carleton Geoscience Centre, 140 Louis Pasteur, Ottawa, Ontario K1N 6N5, Canada

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O. van Breemen

5Geological Survey of Canada, NRCan, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada

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G.A. Jenner

6Department of Earth Sciences, Memorial University of Newfoundland, St. John's, Newfoundland A1B 3X5, Canada

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Doi:

https://doi.org/10.1130/2007.1200(26)

Published:

January 01, 2007

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...

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