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Franke, Christine; Hofmann, Daniela; von Dobeneck, Tilo (2012): Sedimentologic and magnetic data of sediment cores on the western slope of the Mid-Atlantic Ridge. PANGAEA, https://doi.org/10.1594/PANGAEA.779170, Supplement to: Franke, C et al. (2004): Does lithology influence relative paleointensity records? A statistical analysis on South Atlantic pelagic sediments. Physics of the Earth and Planetary Interior, 147, 285-296, https://doi.org/10.1016/j.pepi.2004.07.004

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Abstract:
The relative paleointensity (RPI) method assumes that the intensity of post depositional remanent magnetization (PDRM) depends exclusively on the magnetic field strength and the concentration of the magnetic carriers. Sedimentary remanence is regarded as an equilibrium state between aligning geomagnetic and randomizing interparticle forces. Just how strong these mechanical and electrostatic forces are, depends on many petrophysical factors related to mineralogy, particle size and shape of the matrix constituents. We therefore test the hypothesis that variations in sediment lithology modulate RPI records. For 90 selected Late Quaternary sediment samples from the subtropical and subantarctic South Atlantic Ocean a combined paleomagnetic and sedimentological dataset was established. Misleading alterations of the magnetic mineral fraction were detected by a routine Fe/kappa test (Funk, J., von Dobeneck, T., Reitz, A., 2004. Integrated rock magnetic and geochemical quantification of redoxomorphic iron mineral diagenesis in Late Quaternary sediments from the Equatorial Atlantic. In: Wefer, G., Mulitza, S., Ratmeyer, V. (Eds.), The South Atlantic in the Late Quaternary: reconstruction of material budgets and current systems. Springer-Verlag, Berlin/Heidelberg/New York/Tokyo, pp. 239-262). Samples with any indication of suboxic magnetite dissolution were excluded from the dataset. The parameters under study include carbonate, opal and terrigenous content, grain size distribution and clay mineral composition. Their bi- and multivariate correlations with the RPI signal were statistically investigated using standard techniques and criteria. While several of the parameters did not yield significant results, clay grain size and chlorite correlate weakly and opal, illite and kaolinite correlate moderately to the NRM/ARM signal used here as a RPI measure. The most influential single sedimentological factor is the kaolinite/illite ratio with a Pearson's coefficient of 0.51 and 99.9% significance. A three-member regression model suggests that matrix effects can make up over 50% of the observed RPI dynamics.
Coverage:
Median Latitude: -38.283650 * Median Longitude: -22.060583 * South-bound Latitude: -43.614200 * West-bound Longitude: -24.248500 * North-bound Latitude: -32.510000 * East-bound Longitude: -19.500000
Date/Time Start: 2000-02-19T01:34:00 * Date/Time End: 2000-03-03T14:10:00
Event(s):
GeoB6405-6 * Latitude: -42.000000 * Longitude: -21.853200 * Date/Time: 2000-02-19T01:34:00 * Elevation: -3862.0 m * Recovery: 12.12 m * Location: Central South Atlantic * Campaign: M46/4 * Basis: Meteor (1986) * Method/Device: Gravity corer (Kiel type) (SL) * Comment: geology and geophysics
GeoB6407-1 * Latitude: -42.045000 * Longitude: -19.500000 * Date/Time: 2000-02-20T00:46:00 * Elevation: -3384.0 m * Recovery: 5.45 m * Location: Central South Atlantic * Campaign: M46/4 * Basis: Meteor (1986) * Method/Device: Gravity corer (Kiel type) (SL) * Comment: geology and geophysics
GeoB6408-4 * Latitude: -43.614200 * Longitude: -20.441000 * Date/Time: 2000-02-21T01:03:00 * Elevation: -3797.0 m * Recovery: 10.57 m * Location: Central South Atlantic * Campaign: M46/4 * Basis: Meteor (1986) * Method/Device: Gravity corer (Kiel type) (SL) * Comment: geology and geophysics
Size:
18 datasets

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Datasets listed in this publication series

  1. Franke, C; Hofmann, D; von Dobeneck, T (2004): Age model of sediment core GeoB6405-6. https://doi.pangaea.de/10.1594/PANGAEA.132629
  2. Franke, C; Hofmann, D; von Dobeneck, T (2004): Age model of sediment core GeoB6407-1. https://doi.pangaea.de/10.1594/PANGAEA.132631
  3. Franke, C; Hofmann, D; von Dobeneck, T (2004): Age model of sediment core GeoB6408-4. https://doi.pangaea.de/10.1594/PANGAEA.132633
  4. Franke, C; Hofmann, D; von Dobeneck, T (2004): Age model of sediment core GeoB6422-1. https://doi.pangaea.de/10.1594/PANGAEA.132635
  5. Franke, C; Hofmann, D; von Dobeneck, T (2004): Age model of sediment core GeoB6425-2. https://doi.pangaea.de/10.1594/PANGAEA.132636
  6. Franke, C; Hofmann, D; von Dobeneck, T (2004): Age model of sediment core GeoB6428-1. https://doi.pangaea.de/10.1594/PANGAEA.132639
  7. Franke, C; Hofmann, D; von Dobeneck, T (2004): Sedimentologic and magnetic data of sediment core GeoB6405-6, complete sample set. https://doi.pangaea.de/10.1594/PANGAEA.132691
  8. Franke, C; Hofmann, D; von Dobeneck, T (2004): Sedimentologic and magnetic data of sediment core GeoB6405-6, diagenesis criterion, selected sample set. https://doi.pangaea.de/10.1594/PANGAEA.132698
  9. Franke, C; Hofmann, D; von Dobeneck, T (2004): Sedimentologic and magnetic data of sediment core GeoB6407-1, complete sample set. https://doi.pangaea.de/10.1594/PANGAEA.132692
  10. Franke, C; Hofmann, D; von Dobeneck, T (2004): Sedimentologic and magnetic data of sediment core GeoB6407-1, diagenesis criterion, selected sample set. https://doi.pangaea.de/10.1594/PANGAEA.132699
  11. Franke, C; Hofmann, D; von Dobeneck, T (2004): Sedimentologic and magnetic data of sediment core GeoB6408-4, complete sample set. https://doi.pangaea.de/10.1594/PANGAEA.132693
  12. Franke, C; Hofmann, D; von Dobeneck, T (2004): Sedimentologic and magnetic data of sediment core GeoB6408-4, diagenesis criterion, selected sample set. https://doi.pangaea.de/10.1594/PANGAEA.132700
  13. Franke, C; Hofmann, D; von Dobeneck, T (2004): Sedimentologic and magnetic data of sediment core GeoB6422-1, complete sample set. https://doi.pangaea.de/10.1594/PANGAEA.132694
  14. Franke, C; Hofmann, D; von Dobeneck, T (2004): Sedimentologic and magnetic data of sediment core GeoB6422-1, diagenesis criterion, selected sample set. https://doi.pangaea.de/10.1594/PANGAEA.132701
  15. Franke, C; Hofmann, D; von Dobeneck, T (2004): Sedimentologic and magnetic data of sediment core GeoB6425-2, complete sample set. https://doi.pangaea.de/10.1594/PANGAEA.132695
  16. Franke, C; Hofmann, D; von Dobeneck, T (2004): Sedimentologic and magnetic data of sediment core GeoB6425-2, diagenesis criterion, selected sample set. https://doi.pangaea.de/10.1594/PANGAEA.132702
  17. Franke, C; Hofmann, D; von Dobeneck, T (2004): Sedimentologic and magnetic data of sediment core GeoB6428-1, complete sample set. https://doi.pangaea.de/10.1594/PANGAEA.132696
  18. Franke, C; Hofmann, D; von Dobeneck, T (2004): Sedimentologic and magnetic data of sediment core GeoB6428-1, diagenesis criterion, selected sample set. https://doi.pangaea.de/10.1594/PANGAEA.132703