白令海和楚科奇海表层沉积中的有孔虫及其沉积环境

孟翊; 陈荣华; 郑玉龙

白令海和楚科奇海表层沉积中的有孔虫及其沉积环境

1.
华东师范大学河口海岸研究所, 上海, 200062
2.
国家海洋局海底科学重点实验室, 浙江, 杭州, 310012

基金项目: 中国首次北极科学考察科考项目;国家海洋局海底科学重点实验室资助项目

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出版历程
- 收稿日期: 2001-01-12
- 修回日期: 2001-04-09

Foraminifera in the surface sediments of the Bering and Chukchi Seas and their sedimentary environment

1.
Institute of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
2.
Key Laboratory of Submarine Geosciences, State Oceanic Administration, Hangzhou 310012, China

摘要

摘要: 通过对白令海和北冰洋楚科奇海39个表层沉积样品中有孔虫的定量分析,发现表层沉积中浮游有孔虫稀少可能与该区表层生产力低、碳酸盐溶解作用较强有关,而底栖有孔虫的分布则主要受表层初级生产力以及与水深相关的碳酸盐溶解作用和水团性质所控制,其中北冰洋楚科奇海陆架区有孔虫以Elphidium spp.组合和Nonionella robusta组合为主,丰度和分异度低,受北冰洋沿岸水团控制;白令海陆坡区有孔虫以Uvigerina peregrina-Globobulimina affinis组合为主,含N.robusta较多,丰度和分异度相对高,受太平洋中层和深层水团控制,但该区碳酸盐溶跃层和补偿深度(CCD)相对浅,约分别位于2000和3800m处.此外,白令海陆坡上部表层沉积中含有北冰洋陆坡区典型深水底栖有孔虫种Stetsonia arctica,说明白令海峡两侧的海区曾有深部水交流.
- 白令海和楚科奇海 /
- 有孔虫 /
- 表层沉积 /
- 碳酸盐溶解 /
- 水团
Abstract: Based on a quantitative analysis of foraminifera in 39 surface samples of the Bering and Chukchi Seas,one test of planktonic for aminifera and 742 tests of benthic foraminifera belonging to 26 genera and 28 species are identified.The lack of planktonic foraminifer a in the surface sediments can be related to the low surface primary productivity and strong carbonate dissolution in the study area.It has been revealed that the surface primary productivity,and carbonate dissolution and propert ies of water masses related to the water depth mainly control the distribution of benthic foraminifera.The shelf of the Chukchi Sea is dominated by the Elphidium spp.assemblage and Nonionella robusta assemblage with low foraminiferal abundance and diversity,which is controlled by the coastal water mass of the Arctic Ocean.The slope of the Bering Sea is dominated by the Uvigerina peregrina-Globobulimina affinis assemblage with abundant N.robusta,and relatively high for aminiferal abundance and diversity,which is controlled by the intermediate and deep water masses of the Pacific Ocean.However,the Bering Sea has relatively shallow carbonately socline and compensation depth(CCD),about at 2000 and 3800 m,respectively.In addition,there exist Stetsonia arctica in the surface sediments of the upper slope in the Bering Sea,which is typical deep-sea benthic for aminifera of the slope in the Arctic Ocean.This indicates that the deep waters of the two seas beside the Bering Strait had ever exchanged.
- Bering and Chukchi Seas /
- foraminifera /
- surface sediments /
- carbonate dissolution /
- water masses

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参考文献(14)

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