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TitleLife in the Iapetus Ocean: insights from Paleozoic drill cores and thin sections, southeastern Baffin Island Shelf
AuthorBingham-Koslowski, N EORCID logo
SourceThe Atlantic Geoscience Society (AGS), 44th Colloquium and Annual Meeting, program with abstracts/La Société Géoscientifique de l'Atlantique, 44th Colloquium and Annual Meeting, program with abstracts; 2018 p. 16 Open Access logo Open Access
LinksOnline - En ligne (whole volume - volume complet, 1.39 MB)
Alt SeriesNatural Resources Canada, Contribution Series 20180098
PublisherAtlantic Geoscience Society
Meeting44th Colloquium and Annual Meeting - Atlantic Geoscience Society / La Société Géoscientifique de l'Atlantique; Truro, NS; CA; February 2-3, 2018
Mediapaper; on-line; digital
File formatpdf
ProvinceNunavut; Northern offshore region
NTS15L/11; 15L/12; 15L/13; 15L/14; 15M/03; 15M/04; 15M/05; 15M/06; 15M/11; 15M/12
AreaBaffin Island; Davis Strait; Baffin Bay
Lat/Long WENS -64.0000 -63.0000 63.7500 62.5000
Subjectsmarine geology; sedimentology; paleontology; continental margins; drill core analyses; thin section microscopy; bedrock geology; lithology; sedimentary rocks; depositional environment; fossils; microfossils; bioturbation; alteration; dolomitization; pyrite; Lower Ordovician; Middle Ordovician; Iapetus Ocean; Baffin Island Shelf; Phanerozoic; Paleozoic; Ordovician
ProgramGEM2: Geo-mapping for Energy and Minerals Baffin Region Atlas
Released2018 02 01
AbstractThe pre-Mesozoic rift bedrock geology in the Davis Strait-Baffin Bay region is poorly constrained due to the paucity of subsurface samples. Six Paleozoic, seabed drill cores were recovered from the Southeastern Baffin Island Shelf during Geological Survey of Canada led research cruises in the 1970s (expeditions 75009-Phase 5 and 77027). These drill cores and their associated thin sections, provide unique insights on the depositional environments that existed in the Iapetus Ocean during the Lower to Middle Ordovician. Fossils identified in drill core and thin sections represent a diverse, normal marine community and include bivalves, trilobites, crinoids, sponge spicules, gastropods, brachiopods, corals, cephalopods, dasycladacean green algae, ostracods, bryozoans, and radiolarians, as well as possible foraminifera, calcispheres, and tentaculites. Undifferentiated echinoderm and shell fragments are also common throughout the strata. The matrix is predominantly composed of fine-grained, lime mud with bioturbation observed in four of the six drill cores. The drill cores exhibit absent to preferential to pervasive degrees of dolomitization, with the drill core from 75009-PHASE5 Old Station 4 displaying the greatest degree of alteration. Disseminated pyrite is found throughout the majority of the drill cores and thin sections, and the cores from 75009-PHASE5 Old Stations 8A and 8B contain finely macerated organic matter dispersed in the matrix. Based on observations from the drill cores and thin sections, the preliminary depositional milieus are interpreted to range from shallow, photic zone environments to deeper, open marine settings.
Summary(Plain Language Summary, not published)
Six Lower Paleozoic drill cores and their associated thin sections, recovered during the 1970s from the southeastern Baffin Island Shelf, were examined and described. A wide variety of fossils were identified in the cores and thin sections and include molluscs, trilobites, crinoids, sponge spicules, brachiopods, corals, algae, ostracods, bryozoans, and micro fossils. The matrix is typically composed of fine mud and may be altered by post-burial processes. Initial interpretations from the cores and thin sections, suggest that these rocks were deposited in environments ranging from shallow to deep water.

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