气候变化领域集成服务门户(CCPortal): Local versus seaway-wide trends in deoxygenation in the Late Cretaceous Western Interior Seaway

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DOI	10.1130/B31982.1
	Local versus seaway-wide trends in deoxygenation in the Late Cretaceous Western Interior Seaway
	Tessin A.; Schröder-Adams C.; Elderbak K.; Sheldon N.D.; Hendy I.
发表日期	2019
ISSN	167606
起始页码	1017
结束页码	1030
卷号	131 期号:2021-05-06
英文摘要	The sedimentary record of the Late Cretaceous North American Western Interior Seaway (WIS) is characterized by periods of enhanced organic carbon burial, including an interval that has been identified as Oceanic Anoxic Event (OAE) 3. The timing and duration of this event has proved difficult to constrain, calling into question whether a widespread organic carbon burial event actually occurred. In order to evaluate the nature of OAE 3 better, different localities are studied within the WIS to investigate whether a single anoxic, carbon burial event exists within Upper Cretaceous strata above the global OAE 2. New trace metal and Fe speciation records from the Niobrara Formation within the Sweetgrass Arch region in southern Alberta, Canada, highlight that there were several intervals of deoxygenation. Comparison of these new results with similar records from the southern portion of the seaway (Colorado, USA), allows seaway wide versus local changes in biogeochemical cycling to be differentiated. These results suggest that while enhanced organic carbon burial is favored in the WIS during the Niobrara transgression, there is no evidence for a single, discrete, seaway-wide anoxic event during the Coniacian-Santonian. In the Sweetgrass Arch region, enhanced organic carbon accumulation and the development of anoxia is controlled by the incursion of Tethyan waters into the region and may have been influenced by significant nutrient addition from ash deposition. A sea level control on the incursion of southern sourced water masses and, subsequent deoxygenation and enhanced organic carbon burial in the WIS, may explain why "OAE 3" is only identified in shallow and restricted marine environments that would be sensitive to changes in sea level. A combination of local and eustatic controls on sea level may also explain the diachronous timing of enhanced organic carbon burial in different regions. © 2018 Geological Society of America.
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184917
作者单位	Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI 48109, United States; School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, United Kingdom; Department of Earth Sciences, Carleton University, Ottawa, ON K1S 5B6, Canada; ALS Oil and Gas, Houston, TX 77040, United States
推荐引用方式 GB/T 7714	Tessin A.,Schröder-Adams C.,Elderbak K.,et al. Local versus seaway-wide trends in deoxygenation in the Late Cretaceous Western Interior Seaway[J],2019,131(2021-05-06).
APA	Tessin A.,Schröder-Adams C.,Elderbak K.,Sheldon N.D.,&Hendy I..(2019).Local versus seaway-wide trends in deoxygenation in the Late Cretaceous Western Interior Seaway.Bulletin of the Geological Society of America,131(2021-05-06).
MLA	Tessin A.,et al."Local versus seaway-wide trends in deoxygenation in the Late Cretaceous Western Interior Seaway".Bulletin of the Geological Society of America 131.2021-05-06(2019).