Magnetofossil spike during the Paleocene‐Eocene thermal maximum: Ferromagnetic resonance, rock magnetic, and electron microscopy evidence from Ancora, New …

RE Kopp, TD Raub, D Schumann, H Vali… - …, 2007 - Wiley Online Library
Previous workers identified a magnetically anomalous clay layer deposited on the northern
United States Atlantic Coastal Plain during the Paleocene‐Eocene thermal maximum …

Discovery of giant magnetofossils within and outside of the Palaeocene-Eocene Thermal Maximum in the North Atlantic

P Xue, L Chang, Z Pei, RJ Harrison - Earth and Planetary Science Letters, 2022 - Elsevier
Giant magnetofossils have exceptionally large grain sizes and peculiar morphologies
compared to conventional biogenic magnetite nanoparticles. The origin of these unusual …

Gigantism in unique biogenic magnetite at the Paleocene–Eocene Thermal Maximum

D Schumann, TD Raub, RE Kopp… - Proceedings of the …, 2008 - National Acad Sciences
We report the discovery of exceptionally large biogenic magnetite crystals in clay-rich
sediments spanning the Paleocene–Eocene Thermal Maximum (PETM) in a borehole at …

Quantified abundance of magnetofossils at the Paleocene–Eocene boundary from synchrotron-based transmission X-ray microscopy

H Wang, J Wang, YK Chen-Wiegart… - Proceedings of the …, 2015 - National Acad Sciences
The Paleocene–Eocene boundary (∼ 55.8 million years ago) is marked by an abrupt
negative carbon isotope excursion (CIE) that coincides with an oxygen isotope decrease …

Giant magnetofossils and hyperthermal events

L Chang, AP Roberts, W Williams, JDF Gerald… - Earth and Planetary …, 2012 - Elsevier
Magnetotactic bacteria biomineralize magnetic minerals with precisely controlled size,
morphology, and stoichiometry. These cosmopolitan bacteria are widely observed in aquatic …

Diversification of iron‐biomineralizing organisms during the Paleocene‐Eocene Thermal Maximum: Evidence from quantitative unmixing of magnetic signatures of …

CL Wagner, I Lascu, PC Lippert, R Egli… - Paleoceanography …, 2021 - Wiley Online Library
Conventional magnetofossils represent magnetic mineral remains of magnetotactic bacteria.
Giant magnetofossils have no known modern analog. Both conventional and giant …

A biogenic origin for anomalous fine‐grained magnetic material at the Paleocene‐Eocene boundary at Wilson Lake, New Jersey

PC Lippert, JC Zachos - Paleoceanography, 2007 - Wiley Online Library
The Paleocene‐Eocene Thermal Maximum, which occurred∼ 55.5 Ma, was caused by a
massive release of carbon, as indicated by an∼ 3‰ negative carbon isotope excursion …

An Appalachian Amazon? Magnetofossil evidence for the development of a tropical river‐like system in the mid‐Atlantic United States during the Paleocene‐Eocene …

RE Kopp, D Schumann, TD Raub… - …, 2009 - Wiley Online Library
On the mid‐Atlantic Coastal Plain of the United States, Paleocene sands and silts are
replaced during the Paleocene‐Eocene Thermal Maximum (PETM) by the kaolinite‐rich …

Chains, clumps, and strings: Magnetofossil taphonomy with ferromagnetic resonance spectroscopy

RE Kopp, BP Weiss, AC Maloof, H Vali, CZ Nash… - Earth and Planetary …, 2006 - Elsevier
Magnetotactic bacteria produce intracellular crystals of magnetite or greigite, the properties
of which have been shaped by evolution to maximize the magnetic moment per atom of iron …

Key signatures of magnetofossils elucidated by mutant magnetotactic bacteria and micromagnetic calculations

M Amor, J Wan, R Egli, J Carlut, C Gatel… - Journal of …, 2022 - Wiley Online Library
Magnetotactic bacteria (MTB) produce single‐stranded or multi‐stranded chains of magnetic
nanoparticles that contribute to the magnetization of sediments and rocks. Their magnetic …