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TitleBiostratigraphic correlation of the western and eastern margins of the Labrador-Baffin Seaway
AuthorNorh-Hansen, H; Williams, G L; Fensome, R A
Source11th International Conference on Modern and Fossil Dinoflagellates, program and abstract volume; 2017 p. 68-69
LinksOnline - En ligne (1.77 MB)
Year2017
Alt SeriesNatural Resources Canada, Contribution Series 20170221
Meeting11th International Conference on Modern and Fossil Dinoflagellates; Bordeaux; FA; July 17-21, 2017
Documentbook
Lang.English
Mediapaper; on-line; digital
File formatpdf
ProvinceNunavut; Northern offshore region
AreaLabrador Sea; Baffin Bay; West Greenland Margin; Greenland
Subjectsbiostratigraphy; fossils; fossil assemblages; palynomorphs; palynological analyses; deposition; transgressions; acritarchs; miospores; dinocyst occurrence; Cenozoic
ProgramBaffin Petroleum Systems, GEM2: Geo-mapping for Energy and Minerals
Released2017 07 01
AbstractNew analyses of the palynological assemblages in 13 offshore wells on the Canadian margin and six on the West Greenland Margin, in conjunction with onshore data, have led to a new biostratigraphic framework for the Cretaceous-Cenozoic strata of the Labrador Sea - Davis Strait - Baffin Bay (Labrador-Baffin Seaway) region and the first broad biostratigraphic correlation of the Canadian and Greenland margins. This framework is based on 167 last occurrences and 18 local/regional peak/ common-occurrence events for dinocysts (which include three new genera and 16 new species), acritarchs (including one new species), miospores (including one new species), fungal spores and the fresh-water fern Azolla. Our findings delineate several local and regional hiatuses on both sides of the seaway. The palynomorph assemblages show that most Aptian to Albian sediments were deposited in generally non-marine to marginal marine settings, interrupted by a short-lived shallow-marine episode in the Aptian. A marine transgression commenced in the Cenomanian¿Turonian and led to the most open-marine, oceanic conditions in the Campanian-Lutetian. Subsequent shallowing probably began in the late Lutetian and continued into the Rupelian, when inner neritic and marginal marine palaeoenvironments predominated. Throughout the rest of the Cenozoic, inner neritic palaeoenvironments alternated with marginal marine conditions on the margins of the Labrador-Baffin Seaway. Our findings broadly reflect the tectonic evolution of the seaway, with rift conditions prevailing from Aptian to Danian times, followed by drift through much of the Paleocene and Eocene, and post-drift from Oligocene to the present.
Summary(Plain Language Summary, not published)
We analyzed palynological (organic-walled microfossil) assemblages in 13 offshore wells on the Labrador-Baffin margin and six on the West Greenland Margin to develop a new biostratigraphic framework for the Cretaceous-Cenozoic strata of the Labrador-Baffin Seaway. The framework is based on 167 extinction events and 18 abundance-peak events, mainly for dinoflagellate-cyst species. Our findings identify several gaps in sedimentation on both sides of the seaway. The assemblages show that most Aptian to Albian sediments were deposited mainly in non-marine to marginal marine settings; that a marine transgression began in the Cenomanian-Turonian and led to open-marine conditions in the Campanian-Lutetian; and that shallower water conditions prevailed in the rest of the Cenozoic. Our findings reflect the tectonic evolution of the seaway, with rift conditions prevailing from Aptian to Danian times, followed by drift through much of the Paleocene and Eocene, and post-drift from Oligocene to the present.
GEOSCAN ID306051