Exploring variations in upper ocean structure for the last 2 Ma of the Nansha area by means of calcareous nannofossils |
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| Authors: | LlU Chua nlian CHENG Xinrong |
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| Institution: | Key Laboratory of Marine Geology, Ministry of Education, Tongji University, Shanghai 200092, China |
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| Abstract: | 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 278×106 coccoliths/cm2 ka. The nannofossil assemblages are usually dominated by a lower-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 percentage ofF. profunda display significant oscillations on two different time scales. One is the fluctuation 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. |
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| Keywords: | calcareous nannofossil nutricline upper ocean structure Nansha area |
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