摘要
ONCE ocean floor was below the calcite compensation depth (CCD), deeper than 5000 m, it was widely covered with siliceous ooze or abyssal clay without abyssoconite. The samples of sediment core used in the present research were collected at No. 1787 station during DY85-04 cruise and are mostly of siliceous ooze or abyssal clay. Therefore, traditional and well-considered stable isotopic study using foraminifera has to be given up. Instead, stable isotopic
