An estimate of late Pleistocene geomagnetic intensity variation from Sulu Sea sediments

Details An estimate of late Pleistocene geomagnetic intensity variation from Sulu Sea sediments An estimate of late Pleistocene geomagnetic intensity variation from Sulu Sea sediments

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993e%26psl.120..301s&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 120, no. 3-4, p. 301-310

Computer Science

17

Field Strength, Geomagnetism, Remanence, Sediments, Core Sampling, Dipole Moments, Seas

Scientific paper

Sediments from Site 769 of the Ocean Drilling Program's (ODP's) Leg 124 provide a record of geomagnetic intensity variation over the past 110 ky. Using continuous shipboard measurements exclusively, I estimate the variation in the geomagnetic field strength by employing low-field magnetic susceptibility as a normalization parameter for the measured remanence intensity. By calibrating the resultant relative paleointensity record against previously available Holocene age estimates of absolute paleointensity, I derive an estimate of virtual dipole moment since 110 ka. The record obtained from these Sulu Sea sediments is strikingly like that previously obtained from sediments of a similar age in the Mediterranean Basin with distinct intervals of low intensity near 15, 20, 40 and 65-70 ka. The Sulu sediments also indicate a low-intensity feature near 108 ka. Important differences in paleointensity estimates obtained from these different regions for the interval between 30 and 20 ka suggest that a relatively large non-dipolar component of the geomagnetic field might have been present at that time.

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