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Thermoviscous remagnetization in some Appalachian limestones
Author(s) -
Kent Dennis V.
Publication year - 1985
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/gl012i012p00805
Subject(s) - remanence , magnetite , geology , rock magnetism , demagnetizing field , paleozoic , mineralogy , natural remanent magnetization , relaxation (psychology) , thermal , geophysics , thermodynamics , geochemistry , magnetization , physics , paleontology , magnetic field , psychology , social psychology , quantum mechanics
Experimental evidence shows that blocking temperature‐relaxation time theory for single‐domain magnetite can grossly underestimate laboratory thermal demagnetization temperatures of a present day viscous remanence in Devonian limestones of New York State. Thermoviscous remagnetization at moderately elevated burial temperatures during the late Paleozoic cannot therefore be readily excluded for the origin of the stable secondary component in these rocks. More generally, these results emphasize that single domain thermal activation theory cannot be assumed a priori to correctly predict temperature of thermoviscous remanence acquisition in all magnetite‐bearing rocks.