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doi:10.2204/iodp.proc.324.202.2013 HysteresisHysteresis loops of four samples each from Sites U1346, U1347, and U1350 were made with the VSM (Figs. F18, F19, F20). All hysteresis loops show rapid saturation of the magnetization with increasing field strength and only a small amount of hysteresis. This type of response is typical of titanomagnetite grains. On a Day plot (Day et al., 1977) Mrs/Ms versus Hcr/Hc values for most samples plot in the field that defines pseudosingle-domain behavior (Table T7; Fig. F21). This observation implies that the grains in the samples are either pseudosingle-domain-sized grains or a mixture of multidomain and single-domain grains. Samples from Sites U1346 and U1347 display a distribution that is nearly linear from upper left (lower Hcr/Hc and higher Mrs/Ms) to lower right (higher Hcr/Hc and lower Mrs/Ms), similar to mixtures of single- and multidomain grains, suggesting that these samples have a simple distribution of similar magnetic grains of different sizes (Dunlop, 2002a, 2002b). The distribution of the Site U1350 samples is not linear, suggesting a more complex set of magnetic grains. In addition, samples from Site U1347 plot farthest toward the upper left, whereas samples from Site U1346 plot toward the bottom right. This observation implies that single- and pseudosingle-domain behavior is strongest for Sites U1347 and U1350, whereas the samples from Site U1346 display more influence from multidomain grains. |
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