气候变化领域集成服务门户(CCPortal): Life and death in the Chicxulub impact crater: A record of the Paleocene-Eocene Thermal Maximum

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DOI	10.5194/cp-16-1889-2020
	Life and death in the Chicxulub impact crater: A record of the Paleocene-Eocene Thermal Maximum
	Smith V.; Warny S.; Grice K.; Schaefer B.; Whalen M.T.; Vellekoop J.; Chenot E.; Gulick S.P.S.; Arenillas I.; Arz J.A.; Bauersachs T.; Bralower T.; Demory F.; Gattacceca J.; Jones H.; Lofi J.; Lowery C.M.; Morgan J.; Nuñez Otaño N.B.; O'Keefe J.M.K.; O'Malley K.; Rodríguez-Tovar F.J.; Schwark L.
发表日期	2020
ISSN	18149324
起始页码	1889
结束页码	1899
卷号	16 期号:5
英文摘要	Thermal stress on the biosphere during the extreme warmth of the Paleocene-Eocene Thermal Maximum (PETM) was most severe at low latitudes, with sea surface temperatures at some localities exceeding the 35 C at which marine organisms experience heat stress. Relatively few equivalent terrestrial sections have been identified, and the response of land plants to this extreme heat is still poorly understood. Here, we present a new record of the PETM from the peak ring of the Chicxulub impact crater that has been identified based on nannofossil biostratigraphy, an acme of the dinoflagellate genus Apectodinium, and a negative carbon isotope excursion. Geochemical and microfossil proxies show that the PETM is marked by elevated TEXH 86-based sea surface temperatures (SSTs) averaging 37:8 C, an in- crease in terrestrial input and surface productivity, salinity stratification, and bottom water anoxia, with biomarkers for green and purple sulfur bacteria indicative of photic zone euxinia in the early part of the event. Pollen and plants spores in this core provide the first PETM floral assemblage described from Mexico, Central America, and the northern Caribbean. The source area was a diverse coastal shrubby tropical forest with a remarkably high abundance of fungal spores, indicating humid conditions. Thus, while seafloor anoxia devastated the benthic marine biota and dinoflagellate assemblages were heat-stressed, the terrestrial plant ecosystem thrived. © 2020 Royal Society of Chemistry. All rights reserved.
语种	英语
scopus关键词	abundance; anoxia; bottom water; carbon isotope; dinoflagellate; microfossil; nanofossil; new record; photic zone; sea surface temperature; spore; terrestrial ecosystem; tropical forest; Central America; Mexico [North America]; Chromatiaceae; Dinophyceae; Embryophyta
来源期刊	Climate of the Past
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146664
作者单位	Department of Geology and Geophysics, Louisiana State University, Baton Rouge, LA 70803, United States; Museum of Natural Science, Louisiana State University, Baton Rouge, LA 70803, United States; Western Australian Organic and Isotope Geochemistry Centre, Institute for Geoscience Research, School of Earth and Planetary Science, Curtin University, Perth, WA 6102, Australia; Department of Geosciences, University of Alaska Fairbanks, Fairbanks, AK 99775, United States; Department of Earth and Environmental Sciences, Division of Geology, KU Leuven, Heverlee, 3001, Belgium; Analytical, Environmental and Geo-Chemistry (AMGC), Vrije Universiteit Brussel, Brussels, 1050, Belgium; Institut Polytechnique Lasalle Beauvais, 19 Rue Pierre Waguet, Beauvais, 60026, France; Department of Geological Sciences, Jackson School of Geosciences, University of Texas, Austin, TX 78712, United States; Institute for Geophysics, Jackson School of Geosciences, University of Texas, Austin, TX 78712, United States; Center for Pl...
推荐引用方式 GB/T 7714	Smith V.,Warny S.,Grice K.,et al. Life and death in the Chicxulub impact crater: A record of the Paleocene-Eocene Thermal Maximum[J],2020,16(5).
APA	Smith V..,Warny S..,Grice K..,Schaefer B..,Whalen M.T..,...&Schwark L..(2020).Life and death in the Chicxulub impact crater: A record of the Paleocene-Eocene Thermal Maximum.Climate of the Past,16(5).
MLA	Smith V.,et al."Life and death in the Chicxulub impact crater: A record of the Paleocene-Eocene Thermal Maximum".Climate of the Past 16.5(2020).