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- Title
Domain State Diagnosis in Rock Magnetism: Evaluation of Potential Alternatives to the Day Diagram.
- Authors
Hu, Pengxiang; Heslop, David; Zhao, Xiang; Oda, Hirokuni; Sato, Tetsuro; Harrison, Richard J.; Muxworthy, Adrian R.; Tauxe, Lisa; Roberts, Andrew P.
- 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. Key Points: We assess 10 alternative approaches for domain state diagnosis as potential replacements for the much used but ambiguous Day diagramWe recommend adoption of methods that enable domain state identification of each component in samples with complex magnetic mineral mixturesWe conclude that magnetization curve analysis and FORCs provide the most diagnostic component‐specific domain state identifications
- Subjects
MAGNETIC properties of rocks; MINERALS; HEMATITE; GOETHITE; EARTH sciences
- Publication
Journal of Geophysical Research. Solid Earth, 2019, Vol 124, Issue 6, p5286
- ISSN
2169-9313
- Publication type
Article
- DOI
10.1029/2018JB017049