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- Title
Refining 2 km of Ordovician chronostratigraphy beneath Anticosti Island utilizing integrated chemostratigraphy<sup>1</sup>.
- Authors
McLaughlin, Patrick I.; Emsbo, Poul; Desrochers, André; Bancroft, Alyssa; Brett, Carlton E.; Riva, John F.; Premo, Wayne; Neymark, Leonid; Achab, Aicha; Asselin, Esther; Emmons, M. Matthew; Melchin, Mike
- Abstract
New high-resolution chemostratigraphy, in combination with updated biostratigraphy, refines the chronostratigraphic resolution of the nearly 2 km thick Ordovician section below Anticosti Island. A total of 1414 horizons, spaced at 1.0-1.5 m intervals, were sampled from the New Associated Consolidated Paper (NACP) drill core and analyzed for major and trace elemental composition by portable X-ray fluorescence analyzer (pXRF). Select micrite and calcareous shale powders were then analyzed for δ13Ccarb (number of samples, N = 364) and 87Sr/86Sr ( N = 25). Our results indicate a Floian to early Darriwilian (F3-Dw1) age for the Romaine Formation, a middle Darriwilian to Sandbian (Dw2-Sa1) age for the Mingan Formation, a lower to mid-Katian (Ka1-Ka2) age for the Macasty Formation, an upper Katian (Ka3) age for the lower Vauréal Formation, an uppermost Katian (Ka4) age for the upper Vauréal, and a Hirnantian (H1) age for the Ellis Bay Formation. This integrated chemostratigraphic and biostratigraphic synthesis establishes the position of numerous unconformities, the duration of the intervening depositional sequences, and rates of sedimentation.
- Subjects
ORDOVICIAN paleobotany; ORDOVICIAN Period; ORDOVICIAN paleontology; X-ray fluorescence; BOTRYCHIUM minganense
- Publication
Canadian Journal of Earth Sciences, 2016, Vol 53, Issue 8, p865
- ISSN
0008-4077
- Publication type
Article
- DOI
10.1139/cjes-2015-0242