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Krammer, Kristian (1990): Rock magnetic properties of ODP Hole 109-670A [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.745946, Supplement to: Krammer, K (1990): Rock magnetic properties and opaque mineralogy of selected samples from Hole 670A. In: Detrick, R; Honnorez, J; Bryan, WB; Juteau, T; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 106/109, 269-273, https://doi.org/10.2973/odp.proc.sr.106109.154.1990

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Abstract:
The magnetic properties of 11 samples from Site 670 of Leg 109, 3 harzburgites and 8 highly serpentinized peridotites, have been studied. Reflected light microscopy and Curie temperatures confirm that magnetite is the dominant magnetic mineral in all samples. However, both rock types show different magnetic behavior. Susceptibility, saturation magnetization, and NRM are higher for the serpentinites, because of the higher magnetite content. The hysteresis parameters indicate magnetite particles with pseudosingle domain structure for both rock types. For the remarkable anisotropy of the magnetic susceptibility no definite explanation could be found, because of the complex texture of the samples. In both rock types the presence of maghemite, a product of low temperature oxidation of magnetite, has been indicated by reflected light microscopy and by thermomagnetic analysis. As the maghemite converts to hematite at temperatures above 350°C, the temperature during the serpentinization was below this value assuming that the maghemitization took place at the same time.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: 23.166600 * Longitude: -45.032200
Date/Time Start: 1986-06-12T01:30:00 * Date/Time End: 1986-06-16T16:15:00
Event(s):
109-670A * Latitude: 23.166600 * Longitude: -45.032200 * Date/Time Start: 1986-06-12T01:30:00 * Date/Time End: 1986-06-16T16:15:00 * Elevation: -3625.0 m * Penetration: 92.5 m * Recovery: 4.58 m * Location: South Atlantic Ocean * Campaign: Leg109 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 7 cores; 76.6 m cored; 0 m drilled; 6 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets

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Datasets listed in this publication series

  1. Krammer, K (1990): (Table 3) Hysteresis parameters and ratios Rh and Rj of core samples of ODP Hole 109-670A. https://doi.org/10.1594/PANGAEA.745945
  2. Krammer, K (1990): (Table 1) Petrography, Curie temperature and magnetic concentration of core samples of ODP Hole 109-670A. https://doi.org/10.1594/PANGAEA.745943
  3. Krammer, K (1990): (Table 2) Susceptibility and anisotropy of the susceptibility of core samples of ODP Hole 109-670A. https://doi.org/10.1594/PANGAEA.745944