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doi:10.2204/iodp.proc.324.205.2014 Methods and materialsHysteresis measurements were carried out using an alternating gradient magnetometer at the Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, Université Pierre et Marie Curie (Paris, France). A millimeter-size chip was fixed on the probe with grease. A maximum field of 0.5 T was applied, and the averaging time was 100 ms, which was enough to obtain a good signal because the magnetization was strong enough. Hysteresis loops were corrected for the dia- and paramagnetic contribution, and the parameters Mr (remanent magnetization), Ms (saturation magnetization), and Hc (coercivity field) were calculated from the corrected loops. Backfield direct current curves were also measured for each sample in order to obtain the remanent coercivity field (Hcr). |
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