Component NRM directions on four sediment cores from the Arctic Ocean ...
Arctic deep-sea sediments often record intervals of negative inclination of natural remanence that are tens of centimeters thick, implying magnetic excursions with durations of tens of thousand years that far exceed excursion durations estimated elsewhere, and the lack of tight age control usually p...
| Main Authors: | , |
|---|---|
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
PANGAEA
2013
|
| Subjects: | |
| Online Access: | https://dx.doi.org/10.1594/pangaea.804664 https://doi.pangaea.de/10.1594/PANGAEA.804664 |
| Summary: | Arctic deep-sea sediments often record intervals of negative inclination of natural remanence that are tens of centimeters thick, implying magnetic excursions with durations of tens of thousand years that far exceed excursion durations estimated elsewhere, and the lack of tight age control usually provides excessive freedom in the labeling of Arctic excursions. Fortuitous variations in sedimentation rate have been invoked to explain the “amplified” excursions. Alternating field demagnetization of natural remanent magnetization (NRM) of sediment cores 08JPC, 10JPC, 11JPC, and 13JPC recovered by the Healy Oden Trans-Arctic Expedition in August 2005 (HOTRAX05) to the Mendeleev-Alpha Ridge yields apparent magnetic “excursions” in sediments deposited in the Brunhes Chron. Thermal demagnetization of the NRM, however, implies multiple magnetization components with negative inclination components usually “unblocked” below ?350°C. Analysis of isothermal remanent magnetization acquisition curves from magnetic extracts ... : Supplement to: Xuang, Chuang; Channell, James E T (2010): Origin of apparent magnetic excursions in deep-sea sediments from Mendeleev-Alpha Ridge, Arctic Ocean. Geochemistry, Geophysics, Geosystems, 11(2), Q02003 ... |
|---|