Σ REE in polymetallic nodules from seamount and hill at the seafloor is higher than that of polymetallic nodules from abyssal plain and depression. 海山、丘陵区结核的∑REE高于平原、凹地区结核,且前者Ce异常强于后者。
According of east abyssal plain of the Okinawa Trough with some volcanic materials, it show strong magnetic characteristics different from other sediment environments. 冲绳海槽东槽底平原沉积物含有较多的火山物质,磁学特征与其它沉积环境有明显差异,各磁性参数特征值也明显较强。