气候变化领域集成服务门户(CCPortal): The stratigraphic and geochemical imprints of Late Ordovician glaciation on far-field neritic carbonates; Anticosti Island; eastern Canada

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DOI	10.1016/j.palaeo.2019.109579
	The stratigraphic and geochemical imprints of Late Ordovician glaciation on far-field neritic carbonates; Anticosti Island; eastern Canada
	Mauviel A.; Sinnesael M.; Desrochers A.
发表日期	2020
ISSN	0031-0182
卷号	543
英文摘要	The storm-dominated, open marine neritic carbonate facies, continuously exposed in coastal cliffs and wide rocky tidal flat exposures at the western end of Anticosti Island, form a 315-m-thick, expanded section spanning the Ordovician-Silurian boundary. These carbonate facies display deepening-shallowing trends of different orders, resulting in a hierarchical stacking of sedimentary cycles. The carbonate facies within these multi-order cycles represent sediments that were deposited from shoreline to deeper outer carbonate ramp (>80 m in water depth) and exhibit sea-level changes of several tens of metres in magnitude. Field, petrographic and geochemical evidence support a well-preserved primary δ18O signal in close equilibrium with the original paleoenvironmental conditions. The δ18O intracycle variations, up to 1.0‰ in magnitude, reveal repeated decreasing and increasing values during the transgressive and regressive portions of decametre TR cycles respectively. Although temperature, salinity, and ice volume influenced the recorded primary δ18O signal, orbital scale glacioeustasy ultimately controlled facies and cycle development and δ18O signal during the Katian immediately before the latest Ordovician (Hirnantian) glaciation. The ~3.5 myr-long δ18O signal recorded by our entire succession supports a protracted period of cooling leading into the main phase of latest Ordovician (Hirnantian) glaciation. Spectral analysis of the δ18O record also reveals decametre variations, which are associated with decametre scale transgressive-regressive (TR) cycles; possibly reflecting eccentricity orbital signals. Our study shows the importance of a thick expanded stratigraphic succession sampled at the highest resolution possible to decipher potential linkages between facies changes, multi-order stratigraphic cycles, δ18O signal and the Earth's orbital parameters. © 2020 Elsevier B.V.
英文关键词	Carbonate ramp; Eastern Laurentia; Hirnantian; Spectral analysis; Stratigraphic cycles; δ18O signal
语种	英语
scopus关键词	carbonate ramp; cooling; eccentricity; facies; geochemistry; glaciation; glacioeustacy; Ordovician; shoreline; tidal flat; Anticosti Island; Canada; Quebec [Canada]
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150594
作者单位	Department of Earth and Environmental Sciences, University of Ottawa, 150 Louis Pasteur (460), Ottawa, ON K1N 6N5, Canada; Department of Analytical, Environmental and Geo-Chemistry, Vrije Universiteit Brussel, Pleinlaan 2, Brussels, B-1050, Belgium; Department of Geology, Ghent University, Ghent, Belgium
推荐引用方式 GB/T 7714	Mauviel A.,Sinnesael M.,Desrochers A.. The stratigraphic and geochemical imprints of Late Ordovician glaciation on far-field neritic carbonates; Anticosti Island; eastern Canada[J],2020,543.
APA	Mauviel A.,Sinnesael M.,&Desrochers A..(2020).The stratigraphic and geochemical imprints of Late Ordovician glaciation on far-field neritic carbonates; Anticosti Island; eastern Canada.Palaeogeography, Palaeoclimatology, Palaeoecology,543.
MLA	Mauviel A.,et al."The stratigraphic and geochemical imprints of Late Ordovician glaciation on far-field neritic carbonates; Anticosti Island; eastern Canada".Palaeogeography, Palaeoclimatology, Palaeoecology 543(2020).