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TitleLithological, sedimentological, ichnological, and palynological analysis of 37 conventional core intervals from 15 wells, offshore Labrador (Newfoundland and Labrador) and southeast Baffin Island (Nunavut)
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorDafoe, L TORCID logo; Williams, G L
SourceGeological Survey of Canada, Bulletin 613, 2020, 146 pages, Open Access logo Open Access
PublisherNatural Resources Canada
Mediaon-line; digital
RelatedNRCan photo(s) in this publication
File formatpdf (Adobe® Reader®)
ProvinceNunavut; Newfoundland and Labrador; Northern offshore region; Eastern offshore region
NTS3; 13; 14; 15
AreaLabrador Sea; Labrador; Baffin Island; Davis Strait
Lat/Long WENS -65.0000 -48.0000 63.0000 53.5000
Subjectsmarine geology; regional geology; stratigraphy; sedimentology; paleontology; tectonics; geophysics; Science and Technology; Nature and Environment; continental margins; continental shelf; continental slope; exploration wells; core samples; core analysis; core descriptions; biostratigraphy; ichnology; ichnofossils; ichnofacies; trace fossils; fossils; bioturbation; palynology; palynological analyses; palynomorphs; pollen; spores; fossil assemblages; taxonomy; depositional history; depositional environment; paleoenvironment; sedimentary environments; sedimentary structures; sediment dispersal; thin section microscopy; bedrock geology; lithology; sedimentary rocks; mudstones; sandstones; shales; conglomerates; siltstones; metamorphic rocks; gneisses; igneous rocks; intrusive rocks; granitic rocks; granodiorites; granites; volcanic rocks; basalts; lava flows; volcaniclastics; structural features; grabens; fault zones; tectonic setting; tectonic history; sea floor spreading; rifting; geophysical interpretations; magnetic interpretations; tectonostratigraphic zones; lithostratigraphy; Paleogene; Neogene; Labrador Margin; Labrador Shelf; Baffin Shelf; Alexis Formation; Bjarni Formation; Markland Formation; Freydis Member; Gudrid Formation; Cartwright Formation; Kenamu Formation; Mokami Formation; Saglek Formation; Saglek Basin; Hopedale Basin; Okak Arch; Lady Franklin Arch; Cartwright Arch; Cartwright Fracture Zone; Snorri Fracture Zone; Ungava Fault Zone; Dinoflagellates; Cysts; Acritarchs; Miospores; Bjarni H-81 Well; Bjarni O-82 Well; Gilbert F-53 Well; Gjoa G-37 Well; Hekja O-71 Well; Herjolf M-92 Well; Hopedale E-33 Well; Karlsefni A-13 Well; North Bjarni F-06 Well; North Leif I-05 Well; Ogmund E-72 Well; Roberval K-92 Well; Skolp E-07 Well; Snorri J-90 Well; Tyrk P-100 Well; Canadian Shield; North Atlantic Craton; Torngat Orogen; Superior Craton; Grenville Province; Makkovik Orogen; Phanerozoic; Cenozoic; Tertiary; Mesozoic; Cretaceous; Precambrian
Illustrationslocation maps; stratigraphic columns; tables; core logs; photographs; photomicrographs
ProgramGEM2: Geo-mapping for Energy and Minerals Baffin Petroleum Systems
Released2020 07 09
AbstractThe Labrador Sea began forming during rifting between Greenland and North America in the Early Cretaceous, resulting in grabens and half grabens infilled with syn-rift sediments. These strata were later draped during a sag-basin phase in the Late Cretaceous. Seafloor spreading was initiated in the Maastrichtian, but was regionally taking place by the Paleocene, and the Labrador margin was subsequently overlain by a thick Cenozoic sedimentary wedge. To refine the understanding of this stratigraphic succession, conventional core intervals from exploration wells were analyzed to reassess the biostratigraphy and depositional paleoenvironments. Findings are based on lithological, sedimentological, ichnological, and palynological studies of 37 core intervals from 15 wells along the Labrador margin and southeast Baffin Shelf. Five cores consist of gneissic to granitic Precambrian basement rocks and three are from the Early Cretaceous Alexis Formation basalts, for which general descriptions are provided. The 14 cores from the Bjarni Formation are Barremian to Albian-Cenomanian and represent mostly marginal marine settings. Eight cores from the Upper Cretaceous Markland Formation are early Campanian to Maastrichtian and represent shoreline (Freydis Member), shelf, and slope settings. Three cored intervals from unnamed Paleocene basalt flows from the northern part of Saglek Basin are also evaluated. The youngest four core intervals are from the Gudrid and Cartwright formations of Selandian to earliest Ypresian age and represent tidal channel, deltaic, and shoreface settings. Overall results form the basis for future work, delineating the nature and age of stratigraphic horizons and packages along the Labrador margin.
Summary(Plain Language Summary, not published)
Understanding the stratigraphy of the Labrador margin relies on investigation of samples collected from industry exploration wells. While the wells date from the 1970s to 1980s, our results provide new information on the paleoenvironments of deposition and biostratigraphic age. Utilizing a trace fossil study combined with sedimentology, we shed light on depositional settings for cores from 15 offshore wells. This work is compared with palynological results for paleoenvironments in addition to new results on the biostratigraphic age of the materials. Some of the new ages have drastically changed the age constraints for the syn-rift and primary petroleum target, the Bjarni Formation.

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