Physics
Scientific paper
Nov 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3422302k&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 22, CiteID L22302
Physics
4
Geomagnetism And Paleomagnetism: Geomagnetic Excursions, Geomagnetism And Paleomagnetism: Core Processes (1213, 8115), Geochemistry: Radiogenic Isotope Geochemistry, Geochemistry: Marine Geochemistry (4835, 4845, 4850)
Scientific paper
The duration of geomagnetic excursions may provide important information about the geodynamo. It has proven difficult, however, to assess the exact duration of both excursions and reversals. We combine high-resolution paleomagnetic records from marine sediments with measurements of the 230Th xs flux to the seafloor in order to better constrain the duration of the Iceland Basin Excursion (IBE). We find the duration of the IBE to be ~7-8 kyr, implying that it is considerably longer than previous estimates for the Laschamp Excursion (~2 kyr), and more similar in duration to that of full polarity reversals. There may not be, therefore, a characteristic timescale for transitional field configurations that distinguishes excursions from reversals.
Faurschou Knudsen Mads
Henderson Gideon M.
Mac Niocaill Conall
West Joshua A.
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