Relative geomagnetic paleointensity and 18 O at ODP Site 983 (Gardar Drift, North Atlantic) since 350 ka

Details Relative geomagnetic paleointensity and 18 O at ODP Site 983 (Gardar Drift, North Atlantic) since 350 ka Relative geomagnetic paleointensity and 18 O at ODP Site 983 (Gardar Drift, North Atlantic) since 350 ka

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997e%26psl.153..103c&link_type=abstract

Earth and Planetary Science Letters, vol. 153, Issue 1-2, pp.103-118

Other

63

Paleomagnetism, Magnetic Intensity, O-18, North Atlantic

Scientific paper

At ODP Site 983, relative geomagnetic paleointensity and planktic and benthic 18 O records have been acquired for the last 350 kyr. The mean sedimentation rate in this interval is 11.3 cm/kyr. Magnetic properties and hysteresis ratios indicate that pseudo-single domain magnetite is the remanence carrier. Volume susceptibility ( k ), anhysteretic (ARM) and isothermal (IRM) remanence values vary by a factor of 3-4, well within the criteria usually cited for paleointensity studies. Natural remanent magnetization (NRM) is normalized by ARM and IRM to acquire the paleointensity proxy. Arithmetic means of NRM/ARM and NRM/IRM, calculated for five demagnetization steps in the 25-45 mT range, constitute the relative paleointensity estimates. Some paleointensity lows (particularly those at ~40, ~120 and ~188 ka) are associated with directional excursions of the field, especially the event at ~188 ka (referred to here as the Iceland Basin Event) that constitutes a short-lived polarity reversal. For the last 200 kyr, the records can be correlated with other high-resolution paleointensity records such as those from the Labrador Sea, Mediterranean/Somali Basin and Sulu Sea, implying that the millennial scale features are globally synchronous. A labeling system for paleointensity features is proposed that ties prominent highs and lows to oxygen isotope stages.

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