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Crossover plots: A useful method for plotting SIRM data in paleomagnetism
Author(s) -
Symons D. T. A.,
Cioppa M. T.
Publication year - 2000
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1999gl008472
Subject(s) - paleomagnetism , hematite , magnetite , pyrrhotite , remanence , geology , grain size , demagnetizing field , saturation (graph theory) , mineralogy , goethite , single domain , geophysics , magnetization , magnetic field , pyrite , magnetic domain , chemistry , geomorphology , physics , paleontology , mathematics , organic chemistry , adsorption , quantum mechanics , combinatorics
The effective grain‐size of magnetic minerals, and therefore domain type, controls the saturation isothermal remanent magnetization acquisition and subsequent demagnetization response and can be used to create “crossover” plots for paleomagnetic specimens, where %SIRM is plotted as a function of the field applied, using a logarithmic scale. This paper presents templates of such plots for magnetite, pyrrhotite, hematite and goethite, onto which sample data can be plotted for conventional paleomagnetic specimens to characterize their magnetic mineralogy and effective grain‐size.