Zhao, Xixi; Antretter, Maria J; Solheid, Peter; Inokuchi, Hiroo (2002): Curie temperatures and hysteresis properties of ODP Leg 183 sites, Kerguelen Plateau and Broken Ridge [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.785717, Supplement to: Zhao, X et al. (2002): Identifying magnetic carriers from rock magnetic characterization of Leg 183 basement cores. In: Frey, FA; Coffin, MF; Wallace, PJ; Quilty, PG (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 183, 1-28, https://doi.org/10.2973/odp.proc.sr.183.005.2002
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Abstract:
In this manuscript, we present rock magnetic results of samples recovered during Leg 183. The Leg 183 cores were recovered from six drill sites and display variable rock magnetic properties. The differences in the rock magnetic properties are a function of mineralogy and alteration. Cretaceous subaerial basalt samples with titanomagnetite exhibit a strong Verwey transition in the vicinity of 110 K and have frequency-dependent susceptibility curves that resemble those of synthetic (titano) magnetites. These results are in good agreement with the thermomagnetic characteristics where titanomagnetites with Curie temperatures of ~580°C were identified. The hysteresis ratios suggest that the bulk magnetic grain size is in the psuedo-single-domain boundary. These subaerial basalts experienced high-temperature oxidation and maintained reliable paleomagnetic records. In contrast, the 34-Ma submarine pillow basalts do not show the Verwey transition during the low-temperature experiments. Thermomagnetic analysis shows that the remanent magnetization in this group is mainly carried by a thermally unstable mineral titanomaghemite. The frequency-dependent relationships are opposite of those from the first group and show little sign of titanomagnetite characteristics. Rocks from the third group are oxidized titanomagnetites and have multiple magnetic phases. They have irreversible thermaomagnetic curves and hysteresis ratios clustering toward the multidomain region (with higher Hcr/Hc ratios).
The combined investigation suggests that variations in magnetic properties correlate with changes in lithology, which results in differences in the abundance and size of magnetic minerals. The rock magnetic data on Leg 183 samples clearly indicate that titanomagnetite is the dominant mineral and the primary remanence carrier in subaerial basalt. The generally good magnetic stability and other properties exhibited by titanomagnetite-bearing rocks support the inference that the ChRM isolated from the Cretaceous sites were acquired during the Cretaceous Normal Superchron. The stable inclinations identified from these samples are therefore useful for future tectonic studies.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -44.313895 * Median Longitude: 84.479400 * South-bound Latitude: -59.651630 * West-bound Longitude: 63.936530 * North-bound Latitude: -32.226600 * East-bound Longitude: 97.128180
Date/Time Start: 1998-12-27T05:30:00 * Date/Time End: 1999-02-07T11:00:00
Event(s):
183-1136A * Latitude: -59.651630 * Longitude: 84.834830 * Date/Time Start: 1998-12-27T05:30:00 * Date/Time End: 1998-12-29T11:30:00 * Elevation: -1930.6 m * Penetration: 161.4 m * Recovery: 72.55 m * Location: Indian Ocean * Campaign: Leg183 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 19 cores; 161.4 m cored; 0 m drilled; 45 % recovery
183-1137A * Latitude: -56.833050 * Longitude: 68.093450 * Date/Time Start: 1998-12-31T21:00:00 * Date/Time End: 1999-01-06T16:40:00 * Elevation: -1004.5 m * Penetration: 371.2 m * Recovery: 219.38 m * Location: Indian Ocean * Campaign: Leg183 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 46 cores; 371.2 m cored; 0 m drilled; 59.1 % recovery
183-1138A * Latitude: -53.551750 * Longitude: 75.974880 * Date/Time Start: 1999-01-07T23:30:00 * Date/Time End: 1999-01-31T06:15:00 * Elevation: -1141.4 m * Penetration: 842.7 m * Recovery: 411.98 m * Location: Indian Ocean * Campaign: Leg183 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 89 cores; 842.7 m cored; 0 m drilled; 48.9 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
Download Data
Datasets listed in this publication series
- Zhao, X; Antretter, MJ; Solheid, P et al. (2002): (Table T1) Curie temperatures and lithology of minicores from ODP Leg 183 sites. https://doi.org/10.1594/PANGAEA.785714
- Zhao, X; Antretter, MJ; Solheid, P et al. (2002): (Table T2) Hysteresis properties of minicores from ODP Leg 183 sites. https://doi.org/10.1594/PANGAEA.785716