南海北部盛冰期以来古海洋环境变化的沉积记录

张海生; 周怀阳; 卢冰; 陈荣华; 张富元

南海北部盛冰期以来古海洋环境变化的沉积记录

1.
国家海洋局海底科学重点实验室, 浙江, 杭州, 310012;国家海洋局, 第二海洋研究所, 浙江, 杭州, 310012
2.
中国科学院, 广州地球化学研究所, 广东, 广州, 510640

基金项目: 国家重点基础研究专项经费资助项目(G2000078500)

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出版历程
- 收稿日期: 2003-08-10
- 修回日期: 2004-02-16

Environmental change of palaeo-oceanography recorded in the sediment stratum in the noruhern part of South China Sea since the post glacial period

1.
Key Laboratory of Submarine Geoscience of State Oceanic Adminstration, Hangzhou 310012, China;Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
2.
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China

摘要

摘要: 利用气候替代指标U₃₇^k-SST,浮游有孔虫Globigerinoides ruber的δ¹⁸O,δ¹³C,微体古生物种群变化、陆源和生源组分以及沉积物粒径等,对南海北部69孔沉积物进行综合研究.结果表明U₃₇^k-SST在冰后期为23.3～26.9℃,在末次盛冰期时为22.2～23.8℃.用浮游有孔虫转换函数法对季节温差进行估算,在冰后期为4.5～7.0℃,在末次冰期为7.0～9.0℃,两种估温法均反映了古气候变化相应的海水表层温度.69柱沉积物地层记录在末次盛冰期浮游有孔虫温带优势种Neogloboguadrina pachyderma和营养种Neogloboguadrina dutertrei丰度一致增加;热带优势种Pulleniatina obliqueloculata和Globigerinoide sacculifer以及超微化石丰度则相应减少,而冰后期则相反.浮游有孔虫、钙质超微化石组成和数量的改变也为古海洋温度升、降提供了直接的证据.研究还表明南海北部冰后期以河流搬运为主,末次盛冰期时以风力搬运占优势,这反映了冬季风强化.
- 南海 /
- U₃₇^k-SST /
- 转换函数 /
- 古海洋环境
Abstract: Comprehensive study is carried out for 69 sediment samples by using the climatic index,U₃₇^k-SST,δ¹⁸O,δ¹³C,species composition of fossil micro-organisms as well as sediment type.The result shows that U₃₇^k-SST is 23.3~26.9℃ during the post glacial period and 22.2~23.8℃ during the last glacial period.Conversion function of planktonic foraminifer shows that seasonal temperature difference is 4.5~7.0℃ in the post glacial period and 7.0~9.0℃ in the last glacial period.This reflects the change of sea surface temperature as function of palaeo-climate change.The increase of Neogloboguadrina pachyderma density,a cold water dominant species coincides with that of Neogloboquadrina dutertrei whereas the abundance of tropical dominant species such as Pulleniatina obliqueloculata and Glohigerinoi desacculifer decreases during the last glacial period; the opposite trend is noticed during the post glacial period.The direct evidence of temperature alternation is provided by the assemblages and density variation of planktonic foraminifer,calcium micro-fossil in the palaeo-ocean.The resear chalso suggests that the northern part of South China Sea is mainly influenced by fluvial transport during the post glacial period and by wind during the last glacial period,reflecting the intensification of wind during winter season.
- South China Sea /
- U₃₇^k-SST /
- palaeo-oceano graphy /

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