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

MENG Yi; CHEN Rong-hua; ZHENG Yu-long

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MENG Yi, CHEN Rong-hua, ZHENG Yu-long. Foraminifera in the surface sediments of the Bering and Chukchi Seas and their sedimentary environment[J]. Haiyang Xuebao, 2001, 23(6): 85-93.

Citation:

MENG Yi, CHEN Rong-hua, ZHENG Yu-long. Foraminifera in the surface sediments of the Bering and Chukchi Seas and their sedimentary environment[J]. Haiyang Xuebao, 2001, 23(6): 85-93.

MENG Yi, CHEN Rong-hua, ZHENG Yu-long. Foraminifera in the surface sediments of the Bering and Chukchi Seas and their sedimentary environment[J]. Haiyang Xuebao, 2001, 23(6): 85-93.

Citation:

MENG Yi, CHEN Rong-hua, ZHENG Yu-long. Foraminifera in the surface sediments of the Bering and Chukchi Seas and their sedimentary environment[J]. Haiyang Xuebao, 2001, 23(6): 85-93.

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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

Received Date: 2001-01-12
Rev Recd Date: 2001-04-09

Abstract

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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References(14)

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