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A Critical Appraisal of the "Day" Diagram

Roberts, Andrew P.; Tauxe, Lisa; Heslop, David; Zhao, Xiang; Jiang, Zhaoxia

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The “Day” diagram (Day et al., 1977, https://doi.org/10.1016/0031-9201(77)90108-X) is used widely to make inferences about the domain state of magnetic mineral assemblages. Based on theoretical and empirical arguments, the Day diagram is demarcated into stable “single domain” (SD), “pseudo single domain” (“PSD”), and “multidomain” (MD) zones. It is straightforward to make the necessary measurements for a sample and to plot results within the “domain state” framework based on the boundaries...[Show more]

dc.contributor.authorRoberts, Andrew P.
dc.contributor.authorTauxe, Lisa
dc.contributor.authorHeslop, David
dc.contributor.authorZhao, Xiang
dc.contributor.authorJiang, Zhaoxia
dc.date.accessioned2021-05-11T22:46:23Z
dc.date.available2021-05-11T22:46:23Z
dc.identifier.citationRoberts, A. P., Tauxe, L., Heslop, D., Zhao, X., & Jiang, Z. (2018). A critical appraisal of the “Day” diagram. Journal of Geophysical Research: Solid Earth, 123, 2618–2644. https://doi.org/10.1002/ 2017JB015247
dc.identifier.issn2169-9313
dc.identifier.urihttp://hdl.handle.net/1885/232635
dc.description.abstractThe “Day” diagram (Day et al., 1977, https://doi.org/10.1016/0031-9201(77)90108-X) is used widely to make inferences about the domain state of magnetic mineral assemblages. Based on theoretical and empirical arguments, the Day diagram is demarcated into stable “single domain” (SD), “pseudo single domain” (“PSD”), and “multidomain” (MD) zones. It is straightforward to make the necessary measurements for a sample and to plot results within the “domain state” framework based on the boundaries defined by Day et al. (1977, https://doi.org/10.1016/0031-9201(77)90108-X). We discuss 10 issues that limit Day diagram interpretation, including (1) magnetic mineralogy, (2) the associated magnetocrystalline anisotropy type, (3) mineral stoichiometry, (4) stress state, (5) surface oxidation, (6) magnetostatic interactions, (7) particle shape, (8) thermal relaxation, (9) magnetic particle mixtures, and (10) definitional/measurement issues. In most studies, these variables are unknowns and cannot be controlled for, so that hysteresis parameters for single bulk samples are nonunique and any data point in a Day diagram could result from infinite combinations of relevant variables. From this critical appraisal, we argue that the Day diagram is fundamentally ambiguous for domain state diagnosis. Widespread use of the Day diagram has also contributed significantly to prevalent but questionable views, including underrecognition of the importance of stable SD particles in the geological record and reinforcement of the unhelpful PSD concept and of its geological importance. Adoption of approaches that enable correct domain state diagnosis should be an urgent priority for component‐specific understanding of magnetic mineral assemblages and for quantitative rock magnetic interpretation.
dc.description.sponsorshipA. P. R. acknowledges financial support from the Australian Research Council (through grant DP160100805), and L. T. acknowledges support from the U.S. National Science Foundation (through grants EAR-1547263 and PLR-1541285).
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherWiley Blackwell
dc.rights© 2018 American Geophysical Union
dc.sourceJournal of Geophysical Research: Solid Earth
dc.titleA Critical Appraisal of the "Day" Diagram
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume123
dcterms.dateAccepted2018-03-26
dc.date.issued2018-04-22
local.identifier.absfor040406 - Magnetism and Palaeomagnetism
local.identifier.ariespublicationa383154xPUB10127
local.publisher.urlhttps://agupubs.onlinelibrary.wiley.com/
local.type.statusPublished Version
local.contributor.affiliationRoberts, Andrew, College of Science, ANU
local.contributor.affiliationTauxe, Lisa, University of California
local.contributor.affiliationHeslop, David, College of Science, ANU
local.contributor.affiliationZhao, Xiang, College of Science, ANU
local.contributor.affiliationJiang, Zhaoxia, Ocean University of China
dc.relationhttp://purl.org/au-research/grants/arc/DP160100805
local.bibliographicCitation.issue4
local.bibliographicCitation.startpage2618
local.bibliographicCitation.lastpage2644
local.identifier.doi10.1002/2017JB015247
local.identifier.absseo970104 - Expanding Knowledge in the Earth Sciences
dc.date.updated2020-11-23T11:29:46Z
local.identifier.scopusID2-s2.0-85048030993
dcterms.accessRightsOpen Access
dc.provenancehttps://v2.sherpa.ac.uk/id/publication/11081..."Published version can be made open access on institutional repository after 6 month embargo" from SHERPA/RoMEO site (as at 12.5.2021)
CollectionsANU Research Publications

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