深海柱样粒度分维特征及其古海洋学意义

对南海69柱样粒度数据分析表明，晚更新世以来，粒度在0，2～11um的标度范围内具有分形特征，粒度分维值为1．72～2．02，平均1．84。与同期亚北极B2-9柱地层对比，69柱粒度分维值明显比B2—9柱的高，B2—9柱的粒度在0，2～16um标度范围内具有分形特征，粒度分维值为1.74～1．79，平均1．77。同一柱样不同时期粒度分维值明显不同，南海69柱氧同位素1期(冰后期)为1．88，氧同位素2期(冰期)为1．81，温暖的冰后期粒度分维值高且变化幅度大，寒冷的冰期粒度分维值低且变化幅度小，表明粒度分维值对沉积物的形成环境演化具有良好的指示意义。

Grain-Size Fractal Dimensional Characteristics of the Sediments from Cores in the Deep-sea and Its Paleoceanographic Significance

The grain size of samples from the sediment core 69 in the Eastern South China Sea has been measured. Based on the fractal theory, the fractal dimension (D) of the grain-size has been calculated . Results show that the grain-size distribution has fractal characteristics. Since the late Pleistocene, the D values of core 69 in the Eastern South China Sea are 1.72 - 2.20,with an average of 1.84, a little higher than those from the core B2-9 in the Subarctic Ocean, which are between 1.74 and 1.79, with an average of 1.77. Meanwhile, this change feature as well as that of the same core can be obtained. The D value is 1.88 and its variation is frequent during Stage 1 of the oxygen isotope stratigraphy. The D value is 1.81 and its variation is infrequent during Stage 2 of the oxygen isotope stratigraphy. That is , the high value of D is related to the high paleotemperature and the low value of D is related to the low paleotemperature. The fractal dimension (D) of grain-size is considered as an important proxy index describing paleoenvironment variations recorded from sediments in the continental slope.