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Apparent synfolding magnetization as a result of overlap of pre‐ and post‐folding magnetizations
Author(s) -
Halim Nadir,
Cogné Jean Pascal,
Courtillot Vincent,
Chen Yan
Publication year - 1996
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 - 10.1029/96gl03254
Subject(s) - magnetization , artifact (error) , natural remanent magnetization , geology , component (thermodynamics) , demagnetizing field , remanence , folding (dsp implementation) , a priori and a posteriori , thermal , mineralogy , thermodynamics , physics , computer science , quantum mechanics , magnetic field , electrical engineering , engineering , philosophy , epistemology , computer vision
In most rocks, Natural Remanent Magnetization (NRM) can involve two or more superimposed components. Demagnetizations hopefully result in the separation of these components, which may then be resolved using least‐squares regression methods. In a study of Cretaceous redbed sites from Qaidam (China), thermal demagnetization of most specimens revealed 3 rectilinear segments in orthogonal plots, giving the appearance of a 3‐component magnetization. In order to help deciding if the intermediate straight segments could have resulted from overlap between post‐folding low temperature (LTC) and pre‐folding high temperature components (HTC), we modeled the overlap using a priori information on the directions and relative intensities of LTC and HTC derived from the actual observations. We constructed typical synthetic Zijderveld (1967) diagrams for each site, which could be compared with those obtained from the real samples. We conclude for the Qaidam samples that the intermediate temperature component (ITC) is most likely an artifact resulting from overlap between the LTC and HTC.