VARIATIONS IN PALEOPRODUCTIVITY RECORDED BY BENTHIC. FORAMINIFERA DURING MIS 3 FROM THE WESTERN SOUTH CHINA SEA
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摘要: 选取位于南海西部越南岸外上升流区的17954-2沉积柱状样为研究对象,通过对底栖有孔虫属种含量变化的分析,并与该站位已有的有孔虫研究结果对比,获得该海区MIS 3时期海洋古生产力的变化记录。结果表明,柱状样中的底栖有孔虫堆积速率和指示生产力的底栖有孔虫属种(Bulimina aculeata,Uvigerina peregrina,Cibicidoides wuellerstorfi等)与浮游有孔虫属种(Neogloboquadrina dutertrei,Globigerina bulloides)的含量变化有一致的对应关系。在6个温跃层变浅时期(S1~S6)中,S1~S5阶段出现了低SST、浅DOT、高生产力等现象,表明该区可能有较强的上升流的存在,其形成原因据推测可能是东亚夏季风在这些时期有所加强,而各指标的阶段性变化也表明MIS 3期后期可能出现"特强夏季风"事件。Abstract: Abundance of benthic foraminiferal species and benthic foraminifera accumulate rate(BFAR),as paleoproductivity proxies during MIS 3 from the core 17954-2,located in the modern summer upwelling area off the Vietnam coast in western South China Sea,was studied in this work.The results showed that changes in BFAR and the abundance of benthic foraminiferal species,which are related to productivity(such as Bulimina aculeata,Uvigerina peregrina,Cibicidoides wuellerstorfi),coincided with those of planktonic foraminiferal species(Neogloboquadrina dutertrei,Globigerina bulloides).Six distinct periods of shallower depth of thermocline(DOT)(referred to as S1~S6) were identified in this study.In S1~S5,the lower SST,shallower DOT and higher paleoproductivity indicated an enhanced upwelling,and the causes were supposed to be a strengthened East Asia summer monsoon during these periods.Changes in each proxy also supported a concept that an exceptionally strong summer monsoon could influence this region during the later stages of MIS 3.
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