Worm, Horst-Ulrich; Weinreich, Norbert (1988): Rock magnetism of pelagic sediments from DSDP Leg 85 sites. PANGAEA, https://doi.org/10.1594/PANGAEA.725500, Supplement to: Worm, H-U; Weinreich, N (1988): Rock magnetism of pelagic sediments from the Equatorial Pacific. Earth and Planetary Science Letters, 89(2), 184-192, https://doi.org/10.1016/0012-821X(88)90171-9
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A detailed rock magnetic investigation has been carried out on Deep Sea Drilling Project (DSDP) pelagic sediments from the Central Equatorial Pacific. This comprises hysteresis and thermomagnetic measurements, Lowrie-Fuller test and, for the first time, ferromagnetic resonance (FMR). Nearly stochiometric magnetite in two grain size fractions, single domain (SD) and multi domain (MD), has been deduced to be the carrier of magnetic remanence. Comparatively strong paramagnetic contributions are carried by pyrite, being identified by X-ray analysis. The statistical analysis of paleomagnetic parameters (NRM, MDF, initial susceptibility, Königsberger ratio Q) from a large number (> 1000) of samples, supported by hysteresis measurements, indicates a latitude and sedimentation rate dependent ratio of SD/MD grains. Possible sources for the magnetic constituents are discussed in terms of bacterial, volcanic, meteoritic and authigenic origin.
Median Latitude: 3.519067 * Median Longitude: -133.891900 * South-bound Latitude: 0.498500 * West-bound Longitude: -135.036000 * North-bound Latitude: 5.850000 * East-bound Longitude: -133.309500
Date/Time Start: 1982-04-02T00:00:00 * Date/Time End: 1982-04-21T00:00:00
85-573 * Latitude: 0.498500 * Longitude: -133.309500 * Date/Time: 1982-04-02T00:00:00 * Elevation: -4301.0 m * Penetration: 158.6 m * Recovery: 159 m * Location: North Pacific/TROUGH * Campaign: Leg85 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 19 cores; 158.6 m cored; 0 m drilled; 100.6 % recovery
85-574 * Latitude: 4.208700 * Longitude: -133.330200 * Date/Time: 1982-04-11T00:00:00 * Elevation: -4561.0 m * Penetration: 206.5 m * Recovery: 208.2 m * Location: North Pacific/TROUGH * Campaign: Leg85 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 31 cores; 206.5 m cored; 0 m drilled; 100.8 % recovery
85-575 * Latitude: 5.850000 * Longitude: -135.036000 * Date/Time: 1982-04-21T00:00:00 * Elevation: -4536.0 m * Penetration: 98.6 m * Recovery: 99.4 m * Location: North Pacific/FLANK * Campaign: Leg85 * Basis: Glomar Challenger * Device: Drilling/drill rig (DRILL) * Comment: 11 cores; 98.6 m cored; 0 m drilled; 100.8 % recovery