Abrahamsen, Niels; Sager, William W (1994): Magnetic properties of basalts and sediments of ODP Leg 135 sites [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.803157, Supplement to: Abrahamsen, N; Sager, WW (1994): Magnetic properties of basalts and sediments 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, 717-735, https://doi.org/10.2973/odp.proc.sr.135.121.1994
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Abstract:
Paleomagnetic and rock-magnetic investigations of basalts from Hole 834B in the Lau backarc basin and of sediments from Holes 841A and 841B at the Tonga Ridge are reported. Three groups of blocking temperatures in the basalts suggest the presence of at least three magnetic phases: pure magnetite, a Ti-poor titanomagnetite, and a Ti-rich phase. The drill-string-induced remanence in the basalts is typically between three and six times the original normal remanent magnetization intensity, but it is mostly removed by alternating-field (AF) cleaning in 5 mT. Volume susceptibility values range from 0.04 * 10**-3 to 4 * 10**-3 cgs. The modified Q-ratio J5/sus ranges from 0.5 to 10.
The drill-string-induced remanence behaves different in the two sediment cores from Holes 841A and 841B, which may be the result of differences in the sediment or caused by the different drilling equipment used.
The AF-cleaned inclinations of the sediment in Holes 841A and 841B suggest a slight flattening with increasing depth (up to 6° under a load of 400 m of sediment) to be present. This flattening is likely to be caused by the differential rotation of detrital particles under compaction during diagenesis.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -20.940250 * Median Longitude: -176.439750 * South-bound Latitude: -23.346000 * West-bound Longitude: -177.862000 * North-bound Latitude: -18.501000 * East-bound Longitude: -175.297000
Date/Time Start: 1990-12-23T20:39:00 * Date/Time End: 1991-02-10T20:30:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Abrahamsen, N; Sager, WW (1994): (Table 1) Rock-magnetic properties of basalts from ODP Holes 135-834B and 135-835B. https://doi.org/10.1594/PANGAEA.803153
- Abrahamsen, N; Sager, WW (1994): (Table 2) Inclination and intensity of sediments from ODP Site 135-841. https://doi.org/10.1594/PANGAEA.803155