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TitleUpper Ordovician - Upper Silurian conodont biostratigraphy, Devon Island and southern Ellesmere Island, Canadian Arctic Islands, with implications for regional stratigraphy, eustasy and thermal maturation
AuthorZhang, S; Mirza, K; Barnes, C R
SourceCanadian Journal of Earth Sciences vol. 53, no. 9, 2016 p. 931-949, Open Access logo Open Access
LinksSupplementary Data - Données supplémentaire
Alt SeriesEarth Sciences Sector, Contribution Series 20150351
PublisherCanadian Science Publishing
Mediapaper; on-line; digital
File formatpdf; html; xls
NTS49A/03; 49A/04; 49A/05; 49A/06; 49A/11; 49A/12; 49A/13; 49A/14; 49B; 49C; 49D/03; 49D/04; 49D/05; 49D/06; 49D/11; 49D/12; 49D/13; 49D/14; 49E/03; 49E/04; 49E/05; 49E/06; 49E/11; 49E/12; 49E/13; 49E/14; 49F; 49G/01; 49G/02; 49G/03; 49G/08; 49H/03; 49H/04; 49H/05; 49H/06; 59A; 59B; 59C/01; 59C/02; 59C/03; 59C/04; 59C/05; 59C/06; 59C/07; 59C/08; 59C/09; 59C/10; 59C/11; 59C/12; 59D/01; 59D/02; 59D/03; 59D/04; 59D/05; 59D/06; 59D/07; 59D/08; 59D/09; 59D/10; 59D/11; 59D/12; 69A/01; 69A/02; 69A/07; 69A/08; 69A/09; 69A/10; 69A/15; 69A/16; 69D/01; 69D/02; 69D/07; 69D/08; 69D/09; 69D/10; 69D/15; 69D/16
AreaCanadian Arctic Islands; Devon Island; Ellesmere Island
Lat/Long WENS -99.0000 -82.0000 79.5000 76.0000
Subjectsstratigraphy; paleontology; regional geology; fossil fuels; micropaleontology; microfossils; conodonts; fossil zones; biostratigraphy; fossil distribution, strata; petroleum resources; hydrocarbons; thermal maturation; petroleum exploration; exploration guidelines; bedrock geology; lithology; sedimentary rocks; carbonates; sedimentary basins; stratigraphic analyses; stratigraphic correlations; sedimentary facies; geological history; glaciation; sea level changes; continental margins; continental shelf; foredeeps; tectonic setting; Irene Bay Formation; Allen Bay Formation; Cape Phillips Formation; Amorphognathus ordovicicus; Aspelundia fluegeli; Pterospathodus celloni; Pterospathodus pennatus procerus; Kockelella patula; Kockelella variabilis variabilis; Ozarkodina confluens; Laurentia; Baltica; Pearya; Franklinian Mobile Belt; Central Ellesmere Fold Belt; Jones Sound Fold Belt; Boothia Uplift; Cornwallis Fold Belt; Phanerozoic; Paleozoic; Silurian; Ordovician
Illustrationsgeological sketch maps; stratigraphic columns; photomicrographs; stratigraphic charts
ProgramPolar Continental Shelf Project
ProgramCanada-Nunavut Geoscience Office, Funding Program
AbstractThe conodont biostratigraphy for the Upper Ordovician - Upper Silurian carbonate shelf (Irene Bay and Allen Bay formations) and interfingering basinal (Cape Phillips Formation) facies is established for parts of Devon and Ellesmere islands, central Canadian Arctic Islands. Revisions to the interpreted regional stratigraphic relationships and correlations are based on the stratigraphic distribution of the 51 conodont species representing 32 genera, identified from over 5000 well-preserved conodonts recovered from 101 productive samples in nine stratigraphic sections. The six zones recognized are, in ascending order, Amorphognathus ordovicicus Local-Range Zone, Aspelundia fluegeli Interval Zone, Pterospathodus celloni Local-Range Zone, Pt. pennatus procerus Local-Range Zone, Kockelella patula Local-Range Zone, and K. variabilis variabilis - Ozarkodina confluens Concurrent-Range Zone. These provided a more precise dating of the members and formations and, in particular, the range of hiatuses within this stratigraphic succession. The pattern of regional stratigraphy, facies changes, and hiatuses is interpreted as primarily related to the effects of glacioeustasy associated with the terminal Ordovician glaciation and smaller Early Silurian glacial phases, the backstepping of the Silurian shelf margin, and the geodynamic effects of the collision with Laurentia by Baltica to the east and Pearya to the north. Conodont colour alteration index values (CAI 1-6.5) from the nine sections complement earlier graptolite reflectance data in providing regional thermal maturation data of value in hydrocarbon exploration assessments.
Summary(Plain Language Summary, not published)
The conodont biostratigraphy for the Upper Ordovician-Upper Silurian carbonate shelf (Allen Bay Formation) and interfingering basinal (Cape Phillips Formation) facies is established for parts of Devon and Ellesmere Islands, central Canadian Arctic Islands. Over 5 000 well-preserved conodonts were recovered from 101 productive samples from nine stratigraphic sections. The stratigraphic distribution of the 51 species representing 32 genera is documented. Seven conodont zones (and superzones) were recognized allowing for the more precise dating of the members and formations and, in particular, the range of hiatuses within this stratigraphic succession. Conodont Colour Alteration Index values (CAI 1¿6) from the nine sections provide regional thermal maturation data in hydrocarbon and mineral exploration assessments.

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