Apparent synfolding magnetization as a result of overlap of pre‐ and post‐folding magnetizations

Abstract : 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.
Complete list of metadatas

Cited literature [8 references]  Display  Hide  Download

https://hal-insu.archives-ouvertes.fr/insu-00717704
Contributor : Nathalie Pothier <>
Submitted on : Friday, July 13, 2012 - 2:20:46 PM
Last modification on : Friday, April 5, 2019 - 8:12:32 PM
Long-term archiving on : Sunday, October 14, 2012 - 2:50:36 AM

File

Halim-GRL-1996.pdf
Publisher files allowed on an open archive

Identifiers

Citation

Nadir Halim, Jean-Pascal Cogné, Vincent Courtillot, Yan Chen. Apparent synfolding magnetization as a result of overlap of pre‐ and post‐folding magnetizations. Geophysical Research Letters, American Geophysical Union, 1996, 23 (24), pp.3523-3526. ⟨10.1029/96GL03254⟩. ⟨insu-00717704⟩

Share

Metrics

Record views

361

Files downloads

240