DOI: 10.1016/j.palaeo.2020.109673
论文题名: Neritic ecosystem response to Oceanic Anoxic Event 2 in the Cretaceous Western Interior Seaway, USA
作者: Boudinot F.G. ; Dildar N. ; Leckie R.M. ; Parker A. ; Jones M.M. ; Sageman B.B. ; Bralower T.J. ; Sepúlveda J.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 310182
出版年: 2020
卷: 546 语种: 英语
英文关键词: Foraminifera
; Lipid biomarkers
; Marine ecology
; Smokey Hollow #1 core
; Water column deoxygenation
Scopus关键词: anoxic conditions
; biomarker
; Cretaceous
; ecosystem response
; foraminifera
; global change
; lipid
; marine ecosystem
; photic zone
; redox conditions
; transgression
; water column
; United States
; Western Interior
; algae
; Bacteria (microorganisms)
; Foraminifera
; Heterohelix
英文摘要: Cretaceous oceanic anoxic events (OAEs) were periods of geologically short (<1 million years) global change characterized by elevated temperatures, changes in ocean biogeochemistry, ecological turnover, and the global-scale deposition of black shales. After decades of OAE research, the intensity and spatiotemporal heterogeneity of ocean anoxia and its direct effects on marine ecology remain areas of active study. We present high-resolution organic geochemical and foraminiferal records from the western margin of the Western Interior Seaway (WIS) during the Cenomanian-Turonian Oceanic Anoxic Event 2 (OAE2, ~94 Ma) that indicate reorganization of a neritic ecosystem in response to sea-level rise, and dynamic changes in redox conditions that were likely driven by enhanced marine productivity. A significant transgression prior to OAE2 decreased terrestrial organic matter input and led to enhanced productivity, anoxic bottom waters and sediments, and episodic photic zone euxinia. During the middle of OAE2, further enhanced productivity led to the “Heterohelix shift” in planktic foraminifera, the “Gavelinella acme” in benthic foraminifera, and deoxygenation in sediments, bottom waters, and the upper water column. The combined use of high-temporal resolution algal, bacterial, and terrestrial biomarkers, in addition to foraminiferal records, demonstrates the sensitivity of marine autotrophic and heterotrophic communities to sea-level rise and variable water column oxygenation in marginal marine settings during hyperthermal events. Furthermore, our results reveal the temporal and spatial heterogeneity of anoxia during OAE2 in the WIS. This study highlights widespread shallow marine feedbacks during global change that may affect neritic ecosystems under future warming scenarios. © 2020 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158197
Appears in Collections: 气候变化与战略
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作者单位: Department of Geological Sciences, Institute of Arctic and Alpine Research (INSTAAR), University of Colorado Boulder, 450 UCB, Boulder, CO 80309, United States; Department of Geosciences, University of Massachusetts Amherst, 611 North Pleasant Street, Amherst, MA 01003, United States; Department of Earth and Planetary Sciences, Northwestern University, 2145 Sheridan Rd., Evanston, IL 60208, United States; Department of Geosciences, Pennsylvania State University, 502 Deike Building, University ParkPA 16802, United States
Recommended Citation:
Boudinot F.G.,Dildar N.,Leckie R.M.,et al. Neritic ecosystem response to Oceanic Anoxic Event 2 in the Cretaceous Western Interior Seaway, USA[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2020-01-01,546