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Franke, Christine; Frederichs, Thomas; Dekkers, Mark J (2010): Thermomagnetic measurements on sediment cores GeoB1523-1, GeoB2910-1 and Geob4313-2. PANGAEA, https://doi.org/10.1594/PANGAEA.736089, Supplement to: Franke, C et al. (2007): Efficiency of heavy liquid separation to concentrate magnetic particles. Geophysical Journal International, 170(3), 1053-1066, https://doi.org/10.1111/j.1365-246X.2007.03489.x

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Abstract:
Low-temperature rock magnetic measurements have distinct diagnostic value. However, in most bulk marine sediments the concentration of ferrimagnetic and antiferromagnetic minerals is extremely low, so even sensitive instrumentation often responds to the paramagnetic contribution of the silicate matrix in the residual field of the magnetometer. Analysis of magnetic extracts is usually performed to solve the problems raised by low magnetic concentrations. Additionally magnetic extracts can be used for several other analyses, for example electron microscopy or X-ray diffraction. The magnetic extraction technique is generally sufficient for sediments dominated by magnetite. In this study however, we show that high-coercivity components are rather underrepresented in magnetic extracts of sediments with a more complex magnetic mineralogy. We test heavy liquid separation, using hydrophilic sodium polytungstenate solution Na6[H2W12O40], to demonstrate the efficiencies of both concentration techniques. Low-temperature cycling of zero-field-cooled, field-cooled and saturation isothermal remanent magnetization acquired at room temperature was performed on dry bulk sediments, magnetic extracts, and heavy liquid separates of clay-rich pelagic sediments originating from the Equatorial Atlantic. The results of the thermomagnetic measurements clarify that magnetic extraction favours components with high spontaneous magnetization, such as magnetite and titanomagnetite. The heavy liquid separation is unbiased with respect to high- and low-coercive minerals, thus it represents the entire magnetic assemblage.
Coverage:
Median Latitude: 4.241111 * Median Longitude: -32.037778 * South-bound Latitude: 3.831667 * West-bound Longitude: -41.621667 * North-bound Latitude: 4.845000 * East-bound Longitude: -21.053333
Date/Time Start: 1991-05-17T00:00:00 * Date/Time End: 1997-02-16T02:53:00
Event(s):
GeoB1523-1 * Latitude: 3.831667 * Longitude: -41.621667 * Date/Time: 1991-05-17T00:00:00 * Elevation: -3292.0 m * Recovery: 6.65 m * Location: Amazon Fan * Campaign: M16/2 * Basis: Meteor (1986) * Method/Device: Gravity corer (Kiel type) (SL)
GeoB2910-1 * Latitude: 4.845000 * Longitude: -21.053333 * Date/Time: 1994-08-26T00:00:00 * Elevation: -2703.0 m * Location: Sierra Leone Rise * Campaign: M29/3 * Basis: Meteor (1986) * Method/Device: Gravity corer (Kiel type) (SL) * Comment: Geochemistry
GeoB4313-2 * Latitude: 4.046667 * Longitude: -33.438333 * Date/Time: 1997-02-16T02:53:00 * Elevation: -3178.0 m * Recovery: 8.98 m * Location: Midatlantic Ridge * Campaign: M38/1 * Basis: Meteor (1986) * Method/Device: Gravity corer (Kiel type) (SL) * Comment: CC: gray stiff clay, forams
Size:
9 datasets

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Datasets listed in this publication series

  1. Franke, C; Frederichs, T; Dekkers, MJ (2010): Thermomagnetic measurements on sediment core GeoB1523-1 on dry bulk sediments. https://doi.org/10.1594/PANGAEA.735930
  2. Franke, C; Frederichs, T; Dekkers, MJ (2010): Thermomagnetic measurements on sediment core GeoB1523-1 on heavy liquid separates. https://doi.org/10.1594/PANGAEA.735936
  3. Franke, C; Frederichs, T; Dekkers, MJ (2010): Thermomagnetic measurements on sediment core GeoB1523-1 on magnetic extracts. https://doi.org/10.1594/PANGAEA.735938
  4. Franke, C; Frederichs, T; Dekkers, MJ (2010): Thermomagnetic measurements on sediment core GeoB2910-1 on dry bulk sediments. https://doi.org/10.1594/PANGAEA.736078
  5. Franke, C; Frederichs, T; Dekkers, MJ (2010): Thermomagnetic measurements on sediment core GeoB2910-1 on heavy liquid separates. https://doi.org/10.1594/PANGAEA.736079
  6. Franke, C; Frederichs, T; Dekkers, MJ (2010): Thermomagnetic measurements on sediment core GeoB2910-1 on magnetic extracts. https://doi.org/10.1594/PANGAEA.736080
  7. Franke, C; Frederichs, T; Dekkers, MJ (2010): Thermomagnetic measurements on sediment core GeoB4313-2 on dry bulk sediments. https://doi.org/10.1594/PANGAEA.736086
  8. Franke, C; Frederichs, T; Dekkers, MJ (2010): Thermomagnetic measurements on sediment core GeoB4313-2 on heavy liquid separates. https://doi.org/10.1594/PANGAEA.736087
  9. Franke, C; Frederichs, T; Dekkers, MJ (2010): Thermomagnetic measurements on sediment core GeoB4313-2 on magnetic extracts. https://doi.org/10.1594/PANGAEA.736088