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doi:10.2204/iodp.proc.334.203.2015 Data report: rock magnetism of sediment from IODP Expedition 334 Sites U1378 and U13791Yoichi Usui2AbstractMagnetic properties were measured on sediments from Integrated Ocean Drilling Program Expedition 334 Sites U1378 and U1379. Rock magnetic parameters (i.e., saturation magnetization, Ms; saturation remanence, Mrs; coercivity, Hc; and coercivity of remanence, Hcr) do not show simple downcore trends, sediment columns exhibit sporadic occurrence of layers with high Ms, and other rock magnetic parameters are different in these layers than in the rest of the sediment. Specifically, samples with high Ms show reduced Mrs/Ms, indicating coarser magnetic grains in those samples. Thermomagnetic analyses suggest that low-Ti titanomagnetite is the main magnetic phase in samples with high Ms, whereas other minerals contribute to the magnetic character of samples with low Ms. The variable occurrence of multiple magnetic phases should be considered in future paleomagnetic studies using sediments from Sites U1378 and U1379. |
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