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TitleLinking Mesozoic and Cenozoic tectonic and stratigraphic events in the Orphan Basin, offshore Newfoundland, Canada
AuthorDafoe, L T; Keen, C E; Williams, G L; Dehler, S A
SourceAtlantic Geoscience Society abstracts: 39th annual colloquium & annual general meeting 2013; Atlantic Geology vol. 49, 2013 p. 25,
Alt SeriesEarth Sciences Sector, Contribution Series 20120413
PublisherAtlantic Geoscience Society
MeetingAtlantic Geoscience Society Abstracts: 39th Annual Colloquium & Annual General Meeting 2013; Halifax; CA; February 1-2, 2013
Mediapaper; on-line; digital
File formatpdf
ProvinceEastern offshore region
AreaOrphan Basin; Flemish Pass
Lat/Long WENS-52.0000 -45.0000 51.0000 48.0000
Subjectstectonics; stratigraphy; marine geology; structural geology; bathymetry; submarine features; submarine transport; seafloor topography; seabottom topography; tectonostratigraphic zones; structural interpretations; structural basins; structural features; structural analyses; Cenozoic; Mesozoic; Cretaceous
ProgramFrontier basin analysis, Geoscience for New Energy Supply (GNES)
AbstractThe formation of Orphan Basin is tied to rifting east of Newfoundland and development of the North Atlantic Ocean from the Triassic to Early Cretaceous. Renewed interest in this frontier basin has stemmed from a petroleum discovery in the adjacent Flemish Pass Basin. Our multidisciplinary approach to understanding the development of Orphan Basin builds on previous detailed seismic studies by incorporating data from well logs, core, cuttings, biostratigraphy, seismic and subsidence history. This approach has resulted in the identification of 7 significant tectonostratigraphic events that define Orphan Basin formation and associated stratigraphic responses to these events, which we describe here. 1) Initial rifting began with shallow marine deposition during the Middle to Late Jurassic or perhaps earlier, followed by deformation. 2) During the Tithonian and Early Cretaceous, rifting propagated westward, and thick deposits accumulated against major growth faults. 3) Termination of rifting was succeeded by the development of the Central Orphan High and deformation of Tithonian and Early Cretaceous deposits approximately coinciding with an Aptian sequence boundary. 4) Thinning of continental crust east of Orphan Knoll and possible contemporaneous development of a major flooding surface within the basin took place in the Albian to Cenomanian interval. 5) During the Santonian, another prominent sequence boundary developed around the same time as crustal faulting in northern Orphan Basin and north of the Charlie-Gibbs Fracture Zone (CGFZ). Just north of Orphan Basin and the CGFZ, possible transitional crust developed at this time, while true oceanic crust formed east of Orphan Basin and south of the CGFZ (Chron 34). These events were followed by major subsidence of the Orphan Basin. 6) During the latest Cretaceous to Early Eocene, magmatism was localized in northern Orphan Basin. 7) Finally, during the Tertiary, basin filling and shelf-slope development continued under eustatic sea-level fluctuations.