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学科主题: Paleontology
题名: Western equatorial Pacific productivity and carbonate dissolution over the last 550 kyr: Foraminiferal and nannofossil evidence from ODP Hole 807A
作者: Zhang, JY ; Wang, PX ; Li, QY ; Cheng, XR ; Jin, HY ; Zhang, SY
通讯作者: zjy905@hotmail.com
关键词: paleoproductivity ; thermocline ; carbonate dissolution cycles ; benthic foraminifera ; nannofossils ; eolian processes ; western equatorial Pacific Ocean
刊名: MARINE MICROPALEONTOLOGY
发表日期: 2007
卷: 64, 期:40606, 页:121-140
收录类别: sci
部门归属: Chinese Acad Sci, S China Sea Inst Oceanol, Lab Marginal Sea Geol, Guangzhou 510301, Peoples R China; Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China; Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China; Univ Adelaide, Sch Earth & Environm Sci, Adelaide, SA 5005, Australia
项目归属: 海洋地质
摘要: We analyzed foraminiferal and nannofossil assemblages and stable isotopes in samples from ODP Hole 807A on the Ontong Java Plateau in order to evaluate productivity and carbonate dissolution cycles over the last 550 kyr (kilo year) in the western equatorial Pacific. Our results indicate that productivity was generally higher in glacials than during interglacials, and gradually increased since MIS 13. Carbonate dissolution was weak in deglacial intervals, but often reached a maximum during interglacial to glacial transitions. Carbonate cycles in the western equatorial Pacific were mainly influenced by changes of deep-water properties rather than by local primary productivity. Fluctuations of the estimated thermocline depth were not related to glacial to interglacial alternations, but changed distinctly at similar to 280 kyr. Before that time the thermocline was relatively shallow and its depth fluctuated at a comparatively high amplitude and low frequency. After 280 kyr, the thermocline was deeper, and its fluctuations were at lower amplitude and higher frequency. These different patterns in productivity and thermocline variability suggest that thermocline dynamics probably were not a controlling factor of biological productivity in the western equatorial Pacific Ocean. In this region, upwelling, the influx of cool, nutrient-rich waters from the eastern equatorial Pacific or of fresh waters from rivers have probably never been important, and their influence on productivity has been negligible over the studied period. Variations in the inferred productivity in general are well correlated with fluctuations in the eolian flux as recorded in the northwestern Pacific, a proxy for the late Quaternary history of the central East Asian dust flux into the Pacific. Therefore, we suggest that the dust flux from the central East Asian continent may have been an important driver of productivity in the western Pacific. (c) 2007 Elsevier B.V. All rights reserved.
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WOS记录号: WOS:000249678100001
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4466
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Zhang, JY; Wang, PX; Li, QY; Cheng, XR; Jin, HY; Zhang, SY.Western equatorial Pacific productivity and carbonate dissolution over the last 550 kyr: Foraminiferal and nannofossil evidence from ODP Hole 807A,MARINE MICROPALEONTOLOGY,2007,64(40606):121-140
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