GSTDTAP  > 地球科学
DOI10.1073/pnas.2018169118
In situ magnetic identification of giant, needle-shaped magnetofossils in Paleocene–Eocene Thermal Maximum sediments
Courtney L. Wagner; Ramon Egli; Ioan Lascu; Peter C. Lippert; Kenneth J. T. Livi; Helen B. Sears
2021-02-09
发表期刊Proceedings of the National Academy of Science
出版年2021
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.

领域地球科学
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文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/313931
专题地球科学
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Courtney L. Wagner,Ramon Egli,Ioan Lascu,等. In situ magnetic identification of giant, needle-shaped magnetofossils in Paleocene–Eocene Thermal Maximum sediments[J]. Proceedings of the National Academy of Science,2021.
APA Courtney L. Wagner,Ramon Egli,Ioan Lascu,Peter C. Lippert,Kenneth J. T. Livi,&Helen B. Sears.(2021).In situ magnetic identification of giant, needle-shaped magnetofossils in Paleocene–Eocene Thermal Maximum sediments.Proceedings of the National Academy of Science.
MLA Courtney L. Wagner,et al."In situ magnetic identification of giant, needle-shaped magnetofossils in Paleocene–Eocene Thermal Maximum sediments".Proceedings of the National Academy of Science (2021).
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