Magnetic hysteresis parameters of ODP Site 178-1096 (Table T1)

During Ocean Drilling Program (ODP) Leg 178, we drilled three sites on sediment drifts deposited on the continental rise on the western margin of the Antarctic Peninsula. These hemipelagic drifts were targeted for their potential to preserve a continuous record of the behavior of the West Antarctic Ice Sheet over the last 10 m.y. It has been proposed that drift development is linked to advances and retreats of the Antarctic continental ice sheet (Pudsey and Camerlenghi, 1998, doi:10.1017/S0954102098000376, and references therein; Barker, Camerlenghi, Acton, et al., 1999, doi:10.2973/odp.proc.ir.178.1999). However, the sediment is characterized by a very low carbonate content, with foraminifers restricted to very narrow intervals. This lack of carbonate precludes the construction of a delta18O or CaCO3 stratigraphy, depriving these sites of an important chronologic tool and global ice volume proxy.在大洋钻探计划（Ocean Drilling Program, ODP）第178航次期间，我们于南极半岛西部陆缘大陆隆上发育的沉积物漂移体中完成了3个站位的钻探。本次钻探选取半远洋沉积物漂移体作为目标，是因其有望保存过去10百万年间西南极冰盖演化的连续记录。已有研究提出，沉积物漂移体的发育与南极大陆冰盖的进退过程密切相关（Pudsey与Camerlenghi，1998，doi:10.1017/S0954102098000376及其中参考文献；Barker、Camerlenghi、Acton等，1999，doi:10.2973/odp.proc.ir.178.1999）。然而，该套沉积物的碳酸盐含量极低，且有孔虫仅分布于极窄的地层间隔内。碳酸盐的缺失使得无法建立δ¹⁸O或碳酸钙（CaCO3）地层序列，进而令这三个站位丧失了一项关键的年代学工具与全球冰体积代用指标。