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Abrahamsen, Niels; Sager, William W (1994): Paleomagnetic of the Cobb Mountin event sections [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.803179, Supplement to: Abrahamsen, N; Sager, WW (1994): Cobb mountain geomagnetic polarity event and transitions in three deep-sea sediment cores from the Lau Basin. In: Hawkins, J; Parson, L; Allan, J; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 135, 737-762, https://doi.org/10.2973/odp.proc.sr.135.122.1994

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Abstract:
Detailed paleomagnetic investigations are reported for 283 specimens, sampled from three closely spaced Ocean Drilling Program Leg 135 cores from the Lau Basin. These specimens cover three rather similar records of the reversed Cobb Mountain short polarity event, having an age of about 1.12 m.y.
On the basis of a very detailed subsampling every 0.6 cm, we found that the transition times for the Cobb Mountain geomagnetic polarity event, as seen in the three Lau Basin sediment records, appear to have been as short as 0.6-1.0 k.y., although the duration of the normal-polarity event itself lasted only about 17 ± 4 k.y. The older (R to N) transition as well as the younger (N to R) transition show virtual geomagnetic paths roughly along the Americas, but shifted some 30° ± 10° to the east. These paths conflict with Cobb Mountain transition paths recorded in sediments from the Labrador Sea and the North Atlantic, but they are in fair accordance with sediment records from the Celebes and Sulu seas when corrected for differences in site longitude, suggesting that the transitional fields are dominated by nonaxial, high-order spherical harmonics.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -20.598050 * Median Longitude: -176.832367 * South-bound Latitude: -20.827000 * West-bound Longitude: -176.890000 * North-bound Latitude: -20.222000 * East-bound Longitude: -176.775000
Date/Time Start: 1991-01-09T09:30:00 * Date/Time End: 1991-01-17T16:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets

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Datasets listed in this publication series

  1. Abrahamsen, N; Sager, WW (1994): (Table 2) Paleomagnetic of Cobb Mountain Event Section C1 in ODP Hole 135-837A. https://doi.org/10.1594/PANGAEA.803176
  2. Abrahamsen, N; Sager, WW (1994): (Table 3) Paleomagnetic of Cobb Mountain Event Section C2 in ODP Hole 135-838A. https://doi.org/10.1594/PANGAEA.803177
  3. Abrahamsen, N; Sager, WW (1994): (Table 4) Paleomagnetic of Cobb Mountain Event Section C3 in ODP Hole 135-839A. https://doi.org/10.1594/PANGAEA.803178
  4. Abrahamsen, N; Sager, WW (1994): (Table 1) Estimates of the duration of the Cobb Mountain Event in ODP Leg 135 holes. https://doi.org/10.1594/PANGAEA.803175