Seven thousand year duration for a geomagnetic excursion constrained by 230Thxs

[1] 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 230Thxs f...

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Bibliographic Details
Main Authors: Mads Faurschou Knudsen, Gideon M. Henderson, Conall Mac Niocaill, A. Joshua West, C. Mac Niocaill, A. J. West
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Published: 2007
Subjects:
Knudsen
Iceland
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.605.9476
http://www.earth.ox.ac.uk/~conallm/IBexcursion-duration_GRL2007.pdf
Description
Summary:[1] 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 230Thxs 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. Citation: Knudsen, M. F., G. M.

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