Evidence for abundant isolated magnetic nanoparticles at the Paleocene-Eocene boundary

Huapei Wang, Dennis V. Kent, Michael J. Jackson

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

New rock magnetic results (thermal fluctuation tomography, high-resolution first-order reversal curves and low temperature measurements) for samples from the Paleocene-Eocene thermal maximum and carbon isotope excursion in cored sections at Ancora and Wilson Lake on the Atlantic Coastal Plain of New Jersey indicate the presence of predominantly isolated, near-equidimensional single-domain magnetic particles rather than the chain patterns observed in a cultured magnetotactic bacteria sample or magnetofossils in extracts. The various published results can be reconciled with the recognition that chain magnetosomes tend to be preferentially extracted in the magnetic separation process but, as we show, may represent only a small fraction of the overall magnetic assemblage that accounts for the greatly enhanced magnetization of the carbon isotope excursion sediment but whose origin is thus unclear.

Original languageEnglish (US)
Pages (from-to)425-430
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume110
Issue number2
DOIs
StatePublished - Jan 8 2013

Bibliographical note

Copyright:
Copyright 2013 Elsevier B.V., All rights reserved.

Keywords

  • Impact plume condensate
  • Maghemite
  • Magnetite
  • Ocean Drilling Program Leg 174AX

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