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Finding the VOICE; organic carbon isotope chemostratigraphy of Late Jurassic-Early Cretaceous Arctic Canada

Jennifer M. Galloway, Madeleine L. Vickers, Gregory D. Price, Terence Poulton, Stephen E. Grasby, Thomas Hadlari, Benoit Beauchamp and Kyle Sulphur
Finding the VOICE; organic carbon isotope chemostratigraphy of Late Jurassic-Early Cretaceous Arctic Canada (in Mesozoic of the Arctic; warm, green, and highly diverse, Bas van de Schootbrugge (prefacer), Gunn Mangerud (prefacer), Jennifer M. Galloway (prefacer) and Sofie Lindstrom (prefacer))
Geological Magazine (October 2020) 157 (10): 1643-1657

Abstract

A new carbon isotope record for two high-latitude sedimentary successions that span the Jurassic-Cretaceous boundary interval in the Sverdrup Basin of Arctic Canada is presented. This study, combined with other published Arctic data, shows a large negative isotopic excursion of organic carbon (delta (super 13) C (sub org) ) of 4 ppm (V-PDB) and to a minimum of -30.7 ppm in the probable middle Volgian Stage. This is followed by a return to less negative values of c. -27 ppm. A smaller positive excursion in the Valanginian Stage of c. 2 ppm, reaching maximum values of -24.6 ppm, is related to the Weissert Event. The Volgian isotopic trends are consistent with other high-latitude records but do not appear in delta (super 13) C (sub carb) records of Tethyan Tithonian strata. In the absence of any obvious definitive cause for the depleted delta (super 13) C (sub org) anomaly, we suggest several possible contributing factors. The Sverdrup Basin and other Arctic areas may have experienced compositional evolution away from open-marine delta (super 13) C values during the Volgian Age due to low global or large-scale regional sea levels, and later become effectively coupled to global oceans by Valanginian time when sea level rose. A geologically sudden increase in volcanism may have caused the large negative delta (super 13) C (sub org) values seen in the Arctic Volgian records but the lack of precise geochronological age control for the Jurassic-Cretaceous boundary precludes direct comparison with potentially coincident events, such as the Shatsky Rise. This study offers improved correlation constraints and a refined C-isotope curve for the Boreal region throughout latest Jurassic and earliest Cretaceous time.


ISSN: 0016-7568
EISSN: 1469-5081
Coden: GEMGA4
Serial Title: Geological Magazine
Serial Volume: 157
Serial Issue: 10
Title: Finding the VOICE; organic carbon isotope chemostratigraphy of Late Jurassic-Early Cretaceous Arctic Canada
Title: Mesozoic of the Arctic; warm, green, and highly diverse
Author(s): Galloway, Jennifer M.Vickers, Madeleine L.Price, Gregory D.Poulton, TerenceGrasby, Stephen E.Hadlari, ThomasBeauchamp, BenoitSulphur, Kyle
Author(s): van de Schootbrugge, Basprefacer
Author(s): Mangerud, Gunnprefacer
Author(s): Galloway, Jennifer M.prefacer
Author(s): Lindstrom, Sofieprefacer
Affiliation: Natural Resources Canada, Geological Survey of Canada, Calgary, AB, Canada
Affiliation: Utrecht University, Department of Earth Sciences, Marine Palynology & Paleoceanography Group, Utrecht, Netherlands
Pages: 1643-1657
Published: 202010
Text Language: English
Publisher: Cambridge University Press, London, United Kingdom
References: 115
Accession Number: 2020-080768
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. cols., geol. sketch map
N79°48'57" - N79°48'57", W89°48'20" - W89°48'20"
N79°22'01" - N79°22'01", W87°46'09" - W87°46'09"
Secondary Affiliation: University of Copenhagen, Faculty of Science, Geology Section, DNK, DenmarkUniversity of Plymouth, School of Geography, Earth & Environmental Sciences, GBR, United KingdomUniversity of Calgary, Department of Geosciences, CAN, Canada
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Abstract, Copyright, Cambridge University Press
Update Code: 2020
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