Magnetic mineral diagenesis

AP Roberts - Earth-Science Reviews, 2015 - Elsevier
Reduction–oxidation (redox) reactions occur during burial because sediments contain
reactive mixtures of oxidised and reduced components. Diagenetic chemical reactions …

Understanding fine magnetic particle systems through use of first‐order reversal curve diagrams

AP Roberts, D Heslop, X Zhao… - Reviews of …, 2014 - Wiley Online Library
First‐order reversal curve (FORC) diagrams are constructed from a class of partial magnetic
hysteresis loops known as first‐order reversal curves and are used to understand …

MAX UnMix: A web application for unmixing magnetic coercivity distributions

DP Maxbauer, JM Feinberg, DL Fox - Computers & Geosciences, 2016 - Elsevier
It is common in the fields of rock and environmental magnetism to unmix magnetic mineral
components using statistical methods that decompose various types of magnetization curves …

VARIFORC: An optimized protocol for calculating non-regular first-order reversal curve (FORC) diagrams

R Egli - Global and Planetary Change, 2013 - Elsevier
High-resolution first-order reversal curve (FORC) diagrams are increasingly employed to
characterize magnetic minerals in sediments, and especially as a magnetofossil detection …

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 …

The vortex state in geologic materials: A micromagnetic perspective

I Lascu, JF Einsle, MR Ball… - Journal of Geophysical …, 2018 - Wiley Online Library
A wide variety of Earth and planetary materials are very good recorders of paleomagnetic
information. However, most magnetic grains in these materials are not in the stable single …

Time-resolved 2-million-year-old supernova activity discovered in Earth's microfossil record

P Ludwig, S Bishop, R Egli… - Proceedings of the …, 2016 - National Acad Sciences
Massive stars (M≳ 10 M⊙), which terminate their evolution as core-collapse supernovae,
are theoretically predicted to eject> 10− 5 M⊙ of the radioisotope 60Fe (half-life 2.61 Ma). If …

Magnetic characterization of geologic materials with first-order reversal curves

R Egli - Magnetic measurement techniques for materials …, 2021 - Springer
Since their introduction in Earth sciences in 1990, first-order reversal curve (FORC)
measurements have become an important tool for characterizing geologic materials. The …

An improved algorithm for unmixing first‐order reversal curve diagrams using principal component analysis

RJ Harrison, J Muraszko, D Heslop… - Geochemistry …, 2018 - Wiley Online Library
First‐order reversal curve (FORC) diagrams of synthetic binary mixtures with single‐domain,
vortex state, and multidomain end‐members (EMs) were analyzed using principal …

Domain state diagnosis in rock magnetism: evaluation of potential alternatives to the Day diagram

AP Roberts, P Hu, RJ Harrison… - Journal of …, 2019 - Wiley Online Library
The Day diagram is used extensively in rock magnetism for domain state diagnosis. It has
been shown recently to be fundamentally ambiguous for 10 sets of reasons. This ambiguity …