Open Access

Paleomagnetic directions of the Gauss-Matuyama polarity transition recorded in drift sediments (IODP Site U1314) in the North Atlantic

  • Masao Ohno11Email author,
  • Fumi Murakami11,
  • Fumiki Komatsu11,
  • Yohan Guyodo21, 71,
  • Gary Acton31,
  • Toshiya Kanamatsu41,
  • Helen F. Evans51, 81 and
  • Futoshi Nanayama61
Earth, Planets and Space200860:BF03352845

https://doi.org/10.1186/BF03352845

Received: 4 April 2008

Accepted: 25 August 2008

Published: 26 September 2008

Abstract

The geomagnetic field direction during the Gauss-Matuyama (G-M) polarity transition was investigated from a high-accumulation-rate (≥10 cm/kyr) sediment core drilled in the Gardar drift in the North Atlantic at Site U1314 during Expedition 306 of the Integrated Ocean Drilling Program (IODP). A well-defined characteristic remanent magnetization was generally obtained by alternating field demagnetization. The consistency of the results with records from Icelandic lavas confirms that the North Atlantic drift sediments contain a high-fidelity record of the geomagnetic field change. During the G-M transition, the virtual geomagnetic pole (VGP) latitude shows north-south-north-south rebounding, with the three VGP paths falling within different longitudinal bands. Two of the three paths are close to or within the preferred bands in which transitional VGPs are suggested to be longitudinally confined. Three additional loops occur that approach mid-to-low latitudes from the North or South pole regions. In addition, the VGPs show rapid movement (directional jumps) between VGP clusters.

Key words

Geomagnetismpolarity transitionIntegrated Ocean Drilling ProgramExpedition 306Site U1314