A great number of calcareous nannofossils have been found in the deep-sea sediments of 2.32 Ma at ODP Site 1143 located in the Nansha area, the southern South China Sea. The number of coccoliths varies from about 0.5 ...A great number of calcareous nannofossils have been found in the deep-sea sediments of 2.32 Ma at ODP Site 1143 located in the Nansha area, the southern South China Sea. The number of coccoliths varies from about 0.5 × 106 up to almost 53 × 106 coccoliths/g sediment, with an average of 16 × 106 coccoliths/g sediment. The accumulation rate of total coccoliths varies from 1 × 106 to 278 × 106coccoliths/cm2 ka. The nannofossil assemblages are usually dominated by a Iower-photic species-Florisphaera profunda, of which the average percentage is about 70% in all samples. The absolute abundance and the accumulation rate of nannofossils as well as the per centage of F. profunda display significant oscillations on two different time scales. One is the fluc tuation coincident with the glacial-interglacial cycle, and the other is the long-term changes on a time scale longer than 100 ka. Six evolutionary stages of calcareous nannofossils could be divided for the last 2.32 Ma, from which we can reconstruct the changes in the depth of nutricline of the Nansha area. In this paper, the possible mechanism resulting in these variations is also discussed.展开更多
基金the National Natural Science Foundation of China (Grant No. 49999560) and NKBRSF (Grant Nos. G1999043409 and G2000078500).
文摘A great number of calcareous nannofossils have been found in the deep-sea sediments of 2.32 Ma at ODP Site 1143 located in the Nansha area, the southern South China Sea. The number of coccoliths varies from about 0.5 × 106 up to almost 53 × 106 coccoliths/g sediment, with an average of 16 × 106 coccoliths/g sediment. The accumulation rate of total coccoliths varies from 1 × 106 to 278 × 106coccoliths/cm2 ka. The nannofossil assemblages are usually dominated by a Iower-photic species-Florisphaera profunda, of which the average percentage is about 70% in all samples. The absolute abundance and the accumulation rate of nannofossils as well as the per centage of F. profunda display significant oscillations on two different time scales. One is the fluc tuation coincident with the glacial-interglacial cycle, and the other is the long-term changes on a time scale longer than 100 ka. Six evolutionary stages of calcareous nannofossils could be divided for the last 2.32 Ma, from which we can reconstruct the changes in the depth of nutricline of the Nansha area. In this paper, the possible mechanism resulting in these variations is also discussed.
