| Title | Lithological, sedimentological, ichnological, and palynological analysis of 37 conventional core intervals from 15 wells, offshore Labrador (Newfoundland and Labrador) and southeast Baffin Island
(Nunavut) |
| Download | Downloads |
| |
| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Dafoe, L T ;
Williams, G L |
| Source | Geological Survey of Canada, Bulletin 613, 2020, 146 pages, https://doi.org/10.4095/315362  Open Access |
| Image |  |
| Year | 2020 |
| Publisher | Natural Resources Canada |
| Document | serial |
| Lang. | English |
| Media | on-line; digital |
| Related | NRCan photo(s) in this
publication |
| File format | pdf (Adobe® Reader®) |
| Province | Nunavut; Newfoundland and Labrador; Northern offshore region; Eastern offshore region |
| NTS | 3; 13; 14; 15 |
| Area | Labrador Sea; Labrador; Baffin Island; Davis Strait |
| Lat/Long WENS | -65.0000 -48.0000 63.0000 53.5000 |
| Subjects | marine 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 |
| Illustrations | location maps; stratigraphic columns; tables; core logs; photographs; photomicrographs |
| Program | GEM2: Geo-mapping for Energy and Minerals Baffin Petroleum Systems |
| Released | 2020 07 09 |
| Abstract | The 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. |
| GEOSCAN ID | 315362 |
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