气候变化领域集成服务门户(CCPortal): In situ magnetic identification of giant, needle-shaped magnetofossils in paleocene-eocene thermal maximum sediments

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DOI	10.1073/pnas.2018169118
	In situ magnetic identification of giant, needle-shaped magnetofossils in paleocene-eocene thermal maximum sediments
	Wagner C.L.; Egli R.; Lascu I.; Lippert P.C.; Livi K.J.T.; Sears H.B.
发表日期	2021
ISSN	00278424
卷号	118 期号:6
英文摘要	Near-shore marine sediments deposited during the Paleocene-Eocene Thermal Maximum at Wilson Lake, NJ, contain abundant conventional and giant magnetofossils. We find that giant, needle-shaped magnetofossils from Wilson Lake produce distinct magnetic signatures in low-noise, high-resolution first-order reversal curve (FORC) measurements. These magnetic measurements on bulk sediment samples identify the presence of giant, needle-shaped magnetofossils. Our results are supported by micromagnetic simulations of giant needle morphologies measured from transmission electron micrographs of magnetic extracts from Wilson Lake sediments. These simulations underscore the single-domain characteristics and the large magnetic coercivity associated with the extreme crystal elongation of giant needles. Giant magnetofossils have so far only been identified in sediments deposited during global hyperthermal events and therefore may serve as magnetic biomarkers of environmental disturbances. Our results show that FORC measurements are a nondestructive method for identifying giant magnetofossil assemblages in bulk sediments, which will help test their ecology and significance with respect to environmental change. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Biogenic needles; First-order reversal curves; Magnetofossils; Magnetotactic bacteria; Micromagnetic modeling
语种	英语
scopus关键词	Article; climate change; deoxygenation; environmental change; Eocene; fossil; greenhouse effect; lake sediment; magnetism; magnetofossil; magnetosome; marine environment; New Jersey; Paleocene; priority journal; simulation; transmission electron microscopy
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/180681
作者单位	Department of Geology and Geophysics, University of Utah, Salt Lake City, UT 84112, United States; Division of Data, Methods and Models, Central Institute of Meteorology and Geodynamics, Vienna, 1190, Austria; Department of Mineral Sciences, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, United States; Global Change and Sustainability Center, University of Utah, Salt Lake City, UT 84112, United States; Materials Characterization and Processing Center, Department of Materials Sciences and Engineering, Johns Hopkins University, Baltimore, MD 21218, United States; Department of Geology, Colby College, Waterville, ME 04901, United States
推荐引用方式 GB/T 7714	Wagner C.L.,Egli R.,Lascu I.,et al. In situ magnetic identification of giant, needle-shaped magnetofossils in paleocene-eocene thermal maximum sediments[J],2021,118(6).
APA	Wagner C.L.,Egli R.,Lascu I.,Lippert P.C.,Livi K.J.T.,&Sears H.B..(2021).In situ magnetic identification of giant, needle-shaped magnetofossils in paleocene-eocene thermal maximum sediments.Proceedings of the National Academy of Sciences of the United States of America,118(6).
MLA	Wagner C.L.,et al."In situ magnetic identification of giant, needle-shaped magnetofossils in paleocene-eocene thermal maximum sediments".Proceedings of the National Academy of Sciences of the United States of America 118.6(2021).