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Revised age estimates of Brunhes palaeomagnetic events - Support for a link between geomagnetism and eccentricityRevisions in the dates of reported geomagnetic excursions during the Brunhes Epoch are proposed in light of possible correlations between a section at Gioia Tauro, Italy, deep-sea cores, a core from Lake Biwa, Japan, and some lava flows. The anomalously long, double Blake Event reported at Gioia Tauro is here correlated with the Blake Event (approximately 110 kyr) and the Biwa 1 event (180 plus or minus 5 kyr); an hiatus may be present in the section between these two events. The alpha event at Gioia Tauro is correlated with the Biwa 2 event at about 295 kyr; the beta event with the 'Biwa 3' event at about 400 kyr; the gamma event with the Snake River event at 480 plus or minus 50; and the delta event, not recorded elsewhere, is estimated to have occurred at approximately 620 kyr. These proposed refinements in the age estimates of the excursions suggest an approximately 100 kyr cyclicity. If the events are real and the revised dating is correct, the timing of the geomagnetic events seems to coincide with times of peak eccentricity of the earth's orbit, suggesting a causal connection.
Document ID
19820028327
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Rampino, M. R.
(NASA Goddard Institute for Space Studies New York, NY, United States)
Date Acquired
August 10, 2013
Publication Date
October 1, 1981
Publication Information
Publication: Geophysical Research Letters
Volume: 8
Subject Category
Geophysics
Accession Number
82A11862
Distribution Limits
Public
Copyright
Other

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