气候变化领域集成服务门户(CCPortal): A high-resolution record of environmental changes from a Cretaceous-Paleogene section of Seymour Island; Antarctica

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DOI	10.1016/j.palaeo.2020.109844
	A high-resolution record of environmental changes from a Cretaceous-Paleogene section of Seymour Island; Antarctica
	Scasso R.A.; Prámparo M.B.; Vellekoop J.; Franzosi C.; Castro L.N.; Sinninghe Damsté J.S.
发表日期	2020
ISSN	0031-0182
卷号	555
英文摘要	A high-resolution sedimentological and palynological study was performed in combination with biomarker-based organic geochemical temperature proxies TEX86 and MBT′/CBT, on a 7.4-m-thick continuous section straddling the Cretaceous-Paleogene (K-Pg) boundary at Seymour Island, at the northern tip of the Antarctic Peninsula. The K-Pg interval of the Seymour Island section was deposited in a deltaic/estuarine system with considerable sedimentary input from the erosion of a distant volcanic arc at the Antarctic Peninsula, combined with ash fallouts from explosive volcanic eruptions. The Maastrichtian interval represents the prodelta of a delta prograding in a marginal marine setting, whereas the Paleocene interval was deposited in more open, shallow marine conditions, following sea-level rise and shoal submergence above the K-Pg boundary. Dinocyst biostratigraphy indicates that in the studied section the K-Pg boundary is represented by a gentle erosive surface, 30 cm below a partially-indurated, marker sandstone bed. The dinoflagellate assemblages show quantitative changes across the boundary. Representatives of Manumiella group together with abundant Palambages dominate the assemblages in the lower part of the section, i. e. below the K-Pg boundary. There is an evident peak of Fibrocysta/Ifecysta/Cordosphaeridium just above the boundary. In the upper part of the section, Senegalinium reaches relatively high abundance together with Impletosphaeridium clavus. While relatively high concentrations of soil-derived organic matter inhibit the use of the TEX86 paleothermometer to reconstruct sea surface temperatures, the MBT′/CBT paleothermometer indicates warm mean annual air temperatures for the latest Cretaceous (16.0–16.5 °C). These high temperatures, coinciding with the lowest abundance of the high-latitude pollen taxon Nothofagidites, may reflect the terminal Cretaceous Deccan Traps-warming pulse. Fluctuating temperatures followed in the early Paleocene, characterized by ~2 degrees drop in air temperatures, coincident with the maximum percentage of the high-latitude angiosperm Nothofagidites spp. and the cold-water dinocyst taxon Impletosphaeridium clavus. The recognition of ecological signals of disturbances and their relationship with short-term climatic and environmental changes, provides new insights related to the effect of the impact at the high-latitude K-Pg boundary of Antarctica. © 2020 Elsevier B.V.
英文关键词	Biomarkers; K-Pg; Paleotemperatures; Palynology; Sedimentology
语种	英语
scopus关键词	assembly rule; biostratigraphy; Cretaceous; Cretaceous-Paleogene boundary; dinoflagellate; environmental change; geochemistry; historical record; paleoenvironment; paleotemperature; palynology; proxy climate record; reconstruction; sea surface temperature; sedimentology; Antarctic Peninsula; Antarctica; Seymour Island; West Antarctica; Clavus; Dinophyceae; Magnoliophyta; Manumiella; Nothofagidites
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/150409
作者单位	Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGeBA), Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires-CONICET, Ciudad Universitaria, Pabellón II, Buenos Aires, C1428, Argentina; IANIGLA, CCT-CONICET, Mendoza, Argentina; Division Geology, Department of Earth & Environmental Sciences, KU Leuven, Celestijnenlaan 200E, Leuven, 3001, Belgium; Department of Marine Microbiology and Biogeochemistry, NIOZ Royal Netherlands Institute for Sea Research, and Utrecht University, PO Box 59, Den Burg, Texel, 1790 AB, Netherlands; Organic Geochemistry, Faculty of Geosciences, Utrecht University, Utrecht, Netherlands
推荐引用方式 GB/T 7714	Scasso R.A.,Prámparo M.B.,Vellekoop J.,et al. A high-resolution record of environmental changes from a Cretaceous-Paleogene section of Seymour Island; Antarctica[J],2020,555.
APA	Scasso R.A.,Prámparo M.B.,Vellekoop J.,Franzosi C.,Castro L.N.,&Sinninghe Damsté J.S..(2020).A high-resolution record of environmental changes from a Cretaceous-Paleogene section of Seymour Island; Antarctica.Palaeogeography, Palaeoclimatology, Palaeoecology,555.
MLA	Scasso R.A.,et al."A high-resolution record of environmental changes from a Cretaceous-Paleogene section of Seymour Island; Antarctica".Palaeogeography, Palaeoclimatology, Palaeoecology 555(2020).