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Channell, James E T; Mazaud, Alain; Sullivan, P; Turner, S; Raymo, Maureen E (2013): Rock magentic investigations of ODP Site 162-983. PANGAEA, https://doi.org/10.1594/PANGAEA.808979, Supplement to: Channell, JET et al. (2002): Geomagnetic excursions and paleointensities in the Matuyama Chron at Ocean Drilling Program Sites 983 and 984 (Iceland Basin). Journal of Geophysical Research-Solid Earth, 107(B6), EPM1-1 EPM1-14, https://doi.org/10.1029/2001JB000491

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Abstract:
We report natural remanent magnetization (NRM) directions and geomagnetic paleointensity proxies for part of the Matuyama Chron (0.9-2.2 Ma interval) from two sites located on sediment drifts in the Iceland Basin. At Ocean Drilling Program Sites 983 and 984, mean sedimentation rates in the late Matuyama Chron are 15.9 and 11.5 cm/kyr, respectively. For the older part of the record (>1.2 Ma), oxygen isotope data are too sparse to provide the sole basis for age model construction. The resemblance of the volume susceptibility record and a reference d18O record led us to match the two records to derive the age models. This match, based on Site 983/984 susceptibility, is consistent with available Site 983/984 benthic d18O data. Paleointensity proxies were derived from the slope of the NRM versus anhysteretic remanent magnetization plot for alternating field demagnetization in the 30-60 mT peak field range. Paleointensity lows correspond to polarity reversals at the limits of the Jaramillo, Olduvai, Cobb Mountain, and Réunion Subchrons and to seven excursions in NRM component directions. Magnetic excursions (defined here by virtual geomagnetic polar latitudes crossing the virtual geomagnetic equator) are observed at 932, 1048, 1115, 1190-1215 (Cobb Mountain Subchron), 1255, 1472-1480, 1567-1575 (Gilsa Subchron), and 1977 ka. The results indicate that geomagnetic directional excursions, associated with paleointensity minima, are a characteristic of the Matuyama Chron and probably of polarity chrons in general.
Related to:
Channell, James E T (1999): Geomagnetic paleointensity and directional secular variation at Ocean Drilling Program (ODP) Site 984 (Bjorn Drift) since 500 ka: Comparisons with ODP Site 983 (Gardar Drift). Journal of Geophysical Research-Solid Earth, 104(B10), 22937-22951, https://doi.org/10.1029/1999JB900223
Channell, James E T; Curtis, Jason H; Flower, Benjamin P (2004): The Matuyama-Brunhes boundary interval (500-900 ka) in North Atlantic drift sediments. Geophysical Journal International, 158(2), 489-505, https://doi.org/10.1111/j.1365-246X.2004.02329.x
Channell, James E T; Hodell, David A; Lehman, Benoît (1997): Relative geomagnetic paleointensity and d18O at ODP Site 983 (Gardar Drift, North Atlantic) since 350 ka. Earth and Planetary Science Letters, 153(1-2), 103-118, https://doi.org/10.1016/S0012-821X(97)00164-7
Project(s):
Coverage:
Median Latitude: 60.914408 * Median Longitude: -23.861542 * South-bound Latitude: 60.403500 * West-bound Longitude: -24.082417 * North-bound Latitude: 61.425317 * East-bound Longitude: -23.640667
Date/Time Start: 1995-07-21T00:00:00 * Date/Time End: 1995-07-29T00:00:00
Event(s):
162-983 * Latitude: 60.403500 * Longitude: -23.640667 * Date/Time Start: 1995-07-21T00:00:00 * Date/Time End: 1995-07-24T00:00:00 * Elevation: -1983.7 m * Penetration: 766.5 m * Recovery: 798 m * Location: North Atlantic Ocean * Campaign: Leg162 * Basis: Joides Resolution * Device: Composite Core (COMPCORE) * Comment: 82 cores; 766.5 m cored; 0 m drilled; 104.1% recovery
Size:
4 datasets

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