| Title | Mapping the extent of thinned continental crust across the Orphan Basin, offshore Newfoundland, Canada, using a combination of vintage and new seismic refraction/wide-angle reflection data |
| Author | Welford, J K; Dehler, S A ; Funck, T |
| Source | Geophysical Research Abstracts vol. 19, EGU2017-3757, 2017. |
| Links | Online - En ligne
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| Image |  |
| Year | 2017 |
| Alt Series | Earth Sciences Sector, Contribution Series 20160418 |
| Publisher | Geophysical Research Abstracts |
| Meeting | EGU General Assembly 2017; Vienna; AT; April 23-28, 2017 |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Province | Offshore region |
| Area | Orphan Basin |
| Subjects | geophysics; structural geology; deep basins; seismic refraction surveys; seismic reflection surveys; oceanic crust; continental shelf; continental crust |
| Program | Delineating Canada's Continental Shelf Under UNCLOS, Preparation of a submission for an extended continental shelf in the Atlantic and Arctic Oceans under UNCLOS |
| Released | 2017 04 23 |
| Abstract | The SIGNAL (Seismic Investigations off Greenland, Newfoundland and Labrador) 2009 cruise was undertaken by the Geological Survey of Canada (GSC) and the Geological Survey of Denmark and Greenland
(GEUS), with scientific contributions from Dalhousie University, to collect refraction/wide-angle reflection (RWAR) profiles as part of each country¿s continental shelf program under UNCLOS (United Nations Convention on the Law of the Sea) Article
76. Line 1 extended from the Bonavista Platform off Newfoundland, across the Orphan Basin, to Orphan Knoll and beyond into oceanic crust. The final crustal velocity model across Orphan Basin shows thinned continental crust (15 to 20 km thick) beneath
most of the basin with thinner crust (10 km thick) immediately outboard of the Bonavista Platform, interpreted as a failed rift zone. Seaward of the failed rift, the velocity structure of the thinned continental crust is generally uniform over 250 km
toward Orphan Knoll. Immediately outboard of Orphan Knoll, the crust thins to 8 km and exhibits a velocity structure consistent with oceanic crust. |
| Summary | (Plain Language Summary, not published)
The 2009 cruise was undertaken by the Geological Survey of Canada (GSC) and the Geological Survey of Denmark and Greenland (GEUS), with scientific
contributions from Dalhousie University, to collect refraction/wide-angle reflection (RWAR) profiles as part of each country¿s continental shelf program under UNCLOS (United Nations Convention on the Law of the Sea) Article 76. Line 1 extended from
the Bonavista Platform off Newfoundland, across the Orphan Basin, to Orphan Knoll and beyond into oceanic crust. The results from modelling of the combined dataset support an extension of Canada¿s continental shelf beyond the seaward limits of the
Orphan Basin. |
| GEOSCAN ID | 299850 |
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