Domain State Diagnosis in Rock Magnetism: Evaluation of Potential Alternatives to the Day Diagram

Andrew P. Roberts*, Pengxiang Hu, Richard J. Harrison, David Heslop, Adrian R. Muxworthy, Hirokuni Oda, Tetsuro Sato, Lisa Tauxe, Xiang Zhao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

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 highlights the urgency for adopting suitable alternative approaches to identify the domain state of magnetic mineral components in rock magnetic studies. We evaluate 10 potential alternative approaches here and conclude that four have value for identifying data trends, but, like the Day diagram, they are affected by use of bulk parameters that compromise domain state diagnosis in complex samples. Three approaches based on remanence curve and hysteresis loop unmixing, when supervised by independent data to avoid nonuniqueness of solutions, provide valuable component-specific information that can be linked by inference to domain state. Three further approaches based on first-order reversal curve diagrams provide direct domain state diagnosis with varying effectiveness. Environmentally important high-coercivity hematite and goethite are represented with variable effectiveness in the evaluated candidate approaches. These minerals occur predominantly in noninteracting single-domain particle assemblages in paleomagnetic contexts, so domain state diagnosis is more critical for ferrimagnetic minerals. Treating the high-coercivity component separately following normal rock magnetic procedures allows focus on the more vexing problem of diagnosing domain state in ferrimagnetic mineral assemblages. We suggest a move away from nondiagnostic methods based on bulk parameters and adoption of approaches that provide unambiguous component-specific domain state identification, among which various first-order reversal curve-based approaches provide diagnostic information.

Original languageEnglish
Pages (from-to)5286-5314
Number of pages29
JournalJournal of Geophysical Research: Solid Earth
Volume124
Issue number6
DOIs
Publication statusPublished - 2019 Jun
Externally publishedYes

Keywords

  • Day diagram
  • domain state
  • multidomain
  • rock magnetism
  • single domain
  • vortex

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

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