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Richter, Carl; Blum, Peter; Röhl, Ursula (2001): Magnetic properties of ODP Site 175-1075. PANGAEA, https://doi.org/10.1594/PANGAEA.735259, Supplement to: Richter, C et al. (2001): Data report: Magnetic properties and XRF-scanner data of Site 1075 (Lower Congo Basin). In: Wefer, G; Berger, WH; Richter, C (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 175, 1-31, https://doi.org/10.2973/odp.proc.sr.175.214.2001

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Abstract:
We present sediment magnetic and chemical analysis of cyclic ocean sediments of the upwelling region of the Lower Congo Basin (equatorial Atlantic). We investigated two >100-k.y. intervals from Ocean Drilling Program Site 1075 to analyze the hysteresis properties, sources of magnetic susceptibility, anhysteretic remanent magnetizations, thermomagnetic behavior, and element concentrations of Fe, Ca, Ti, Mn, and K using an X-ray fluorescence (XRF) core scanner. The upper interval was sampled between 14 and 32 meters composite depth (mcd; 0.09-0.21 Ma) and the lower between 141 and 163 mcd (1.31-1.54 Ma) at a resolution of 20 cm, which represents a temporal resolution of 2.0 and 1.3 k.y., respectively. XRF core-scanner data were acquired at 5-cm intervals. The measurements show that ferri(o)magnetic minerals have no significant influence on the cyclicity of the magnetic susceptibility, which is dominated by paramagnetic and diamagnetic minerals and reflects changes of sediment input from the Congo River. The Fe, Ti, K, and Mn concentrations covary with the magnetic susceptibility where high concentrations of these elements correlate with intervals of high susceptibility and low concentrations with intervals of low susceptibility. The Ca counts correlate well with the calcium carbonate concentration but do not show the same cyclicity as the other elements or the susceptibility. With the exception of the Ca concentration, which is significantly higher in the upper interval, and the magnetic grain size, which indicates that less fine grained magnetite is present in the lower interval, no significant differences in the properties of the upper and the lower intervals were detected.
Project(s):
Coverage:
Latitude: -4.785300 * Longitude: 10.074983
Date/Time Start: 1997-08-23T19:50:00 * Date/Time End: 1997-08-25T18:10:00
Event(s):
175-1075A * Latitude: -4.785300 * Longitude: 10.074970 * Date/Time Start: 1997-08-23T19:50:00 * Date/Time End: 1997-08-24T23:40:00 * Elevation: -2995.7 m * Penetration: 201 m * Recovery: 213.75 m * Location: Benguela Current, South Atlantic Ocean * Campaign: Leg175 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 22 cores; 201 m cored; 0 m drilled; 106.3 % recovery
175-1075B * Latitude: -4.785300 * Longitude: 10.075020 * Date/Time Start: 1997-08-24T23:40:00 * Date/Time End: 1997-08-25T18:10:00 * Elevation: -2995.2 m * Penetration: 204.5 m * Recovery: 215.03 m * Location: Benguela Current, South Atlantic Ocean * Campaign: Leg175 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 22 cores; 204.5 m cored; 0 m drilled; 105.1 % recovery
Size:
4 datasets

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