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Channell, James E T; Xuang, Chuang (2013): Component NRM directions for sediment core HLY0503-06JPC. PANGAEA, https://doi.org/10.1594/PANGAEA.804615, Supplement to: Channell, JET; Xuang, C (2009): Self-reversal and apparent magnetic excursions in Arctic sediments. Earth and Planetary Science Letters, 284(1-2), 124-131, https://doi.org/10.1016/J.Epsl.2009.04.020

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Abstract:
The Arctic oceans have been fertile ground for the recording of apparent excursions of the geomagnetic field, implying that the high latitude field had unusual characteristics at least over the last 1–2 Myrs. Alternating field demagnetization of the natural remanent magnetization (NRM) of Core HLY0503-6JPC from the Mendeleev Ridge (Arctic Ocean) implies the presence of primary magnetizations with negative inclination apparently recording excursions in sediments deposited during the Brunhes Chron. Thermal demagnetization, on the other hand, indicates the presence of multiple (often anti-parallel) magnetization components with negative inclination components having blocking temperatures predominantly, but not entirely, below ~ 350 °C. Thermo-magnetic tests, X-ray diffraction (XRD) and scanning electron microscopy (SEM) indicate that the negative inclination components are carried by titanomaghemite, presumably formed by seafloor oxidation of titanomagnetite. The titanomaghemite apparently carries a chemical remanent magnetization (CRM) that is partially self-reversed relative to the detrital remanent magnetization (DRM) carried by the host titanomagnetite. The partial self-reversal could have been accomplished by ionic ordering during oxidation, thereby changing the balance of the magnetic moments in the ferrimagnetic sublattices.
Coverage:
Latitude: 78.293817 * Longitude: -176.986150
Date/Time Start: 2005-08-18T00:00:00 * Date/Time End: 2005-08-18T00:00:00
Minimum DEPTH, sediment/rock: 0.03 m * Maximum DEPTH, sediment/rock: 12.87 m
Event(s):
HLY0503-06JPC * Latitude: 78.293817 * Longitude: -176.986150 * Date/Time: 2005-08-18T00:00:00 * Elevation: -800.0 m * Recovery: 12.1 m * Location: Mendeleev Ridge, Arctic Ocean * Campaign: HLY0503 (Healy-Oden Trans Arctic Expedition 2005 (HOTRAX05)) * Basis: Healy * Device: Jumbo Piston Core (JPC)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Core section labelSec labelXuang, Chuang
2DEPTH, sediment/rockDepthmGeocode
3DeclinationDecldegXuang, ChuangComponent declination calculated using NRM data from the 20 mT to 80 mT AF demagnetization steps, using principle component analysis method
4InclinationIncldegXuang, ChuangComponent inclination calculated using NRM data from the 20 mT to 80 mT AF demagnetization steps, using principle component analysis method
5Maximum angular deviationMADdegXuang, Chuang
Size:
4568 data points

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