赤道西太平洋晚第四纪古生产力变化: ODP 807A孔的记录

张江勇; 汪品先; 成鑫荣; 金海燕; 张拭颖

Volume 32 Issue 3

May 2007

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Article Navigation > Earth Science > 2007 > 32(3): 303-312

ZHANG Jiang-yong, WANG Pin-xian, CHENG Xin-rong, JIN Hai-yan, ZHANG Shi-ying, 2007. Late Quaternary Variations of Productivity in the Western Equatorial Pacific Ocean: Records from ODP Hole 807A. Earth Science, 32(3): 303-312.

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Late Quaternary Variations of Productivity in the Western Equatorial Pacific Ocean: Records from ODP Hole 807A

1.
CAS Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
2.
State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
3.
Graduate School of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2006-08-26
Publish Date: 2007-05-25

Abstract

Abstract

Microfossil assemblages and foraminifer isotopes from the upper part of ODP Hole 807A on the Ontong Java plateau were studied to provide evidence for discussing Late Quaternary productivity variations with glacial cycles in the western equatorial Pacific. Multi-proxy results reveal that productivity gradually increased in general since marine isotope stage (MIS) 13, and was higher in glacial times than in interglacial times. The thermocline proxies do not completely fit into glacial-interglacial cycles, but present two stages of thermocline changes: shallower before 280 ka with higher amplitude and lower frequency abundance fluctuations; deeper after 280 ka with higher frequency and lower amplitude fluctuations. The distinct modes of variations between productivity and thermocline suggest that thermocline change is not a primary controlling factor of biological productivity in the western equatorial Pacific. As the fluctuations of paleoproductivity from Hole 807A match with dust flux records from the northwest Pacific, we propose that dust carried from east central Asian is likely to be more significant in enhancing biological productivity in the western equatorial Pacific.
- paleoproductivity,
- thermocline,
- eolian process,
- benthic foraminfera,
- western equatorial Pacific Ocean

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References(41)

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