晚新生代日本海古生产力演化——研究进展评述  

Late Cenozoic Paleo-productivity Evolution of the Japan Sea:A review

作　　者：程宇龙 万世明[1] CHENG YuLong;WAN ShiMing(Key Laboratory of Marine Geology and Environment,Institute of Oceanology,Chinese Academy of Sciences,Qingdao,Shandong 266071,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院海洋研究所海洋地质与环境重点实验室,山东青岛266071 [2]中国科学院大学,北京100049

出　　处：《沉积学报》2023年第6期1714-1738,共25页Acta Sedimentologica Sinica

基　　金：国家自然科学基金项目(42125602,42076052)。

摘　　要：【意义】海洋表层初级生产力及其生物泵过程是海洋碳循环的关键环节。日本海作为西北太平洋一个主要的边缘海,其晚新生代古生产力演化与区域构造/火山活动、东亚季风/西风、洋流演变、全球气候和海平面变化等密切相关,是探寻地球系统科学的极佳窗口。【进展和结论】得益于一系列国际大洋钻探计划(DSDP31、ODP127/128和IODP346)等航次的相关研究,有关日本海古海洋演化,尤其是古生产力演化重建方面取得了许多重要认识。日本海古生产力的常用代用指标包括沉积物的微量元素组成、生物标志物、生源组分含量及同位素组成、微体古生物化石种属特征等。在地质时间尺度,日本海表层初级生产力主要取决于浮游生物必需的主要营养盐(氮、磷和硅)和微量营养盐(铁、锰、钴、锌、铜等),而日本海的营养盐主要通过风尘输入、火山活动、表层和深层洋流携带过来。在构造时间尺度,日本海古生产力的长期演化及其驱动机制(如风尘、火山铁肥和洋流贡献)尚不清楚,区域构造演化与海道开合、全球气候和海平面变化、火山活动及亚洲风尘输入演化等可能是关键驱动因素。在轨道—千年尺度,日本海沉积了深—浅色的韵律层,表层生产力大体表现出冰期降低而间冰期增加的特征,这主要取决于水体交换和层化状况改变导致的营养盐供应变化。目前,日本海古生产力的重建主要集中在晚第四纪,晚新生代构造尺度的研究则相对较少。【未来展望】由于日本海缺乏钙质生物沉积,硅藻化石显示出很好的研究潜力。在未来研究中,一方面要发展新指标体系如硅藻稳定同位素并结合硅藻种属组合,以重建日本海晚新生代古生产力的长期演化历史;另一方面需要深入探讨海洋初级生产力与区域构造演化及全球气候变化的联系。[Significance]Surface ocean primary productivity and biological pump processes are key components in the global ocean carbon cycle.As one of the major marginal seas in the northwest Pacific,the long-term evolution of Late Cenozoic paleo-productivity in the Japan Sea is closely linked to regional tectonics,East Asian monsoon/wester-lies,oceanic currents,global climate and sea-level changes.Thus,the Japan Sea provides an excellent window into the Earth’s systems.[Progress and Conclusions]A benefit from the series of International Ocean Drilling Programs(DSDP Exp.31,ODP Exp.127/128 and IODP Exp.346)and consequent post-expedition research has been the re-markable increase in knowledge of the paleo-oceanography of the Japan Sea,especially in the reconstruction of paleo-productivity.Continuous cores obtained from IODP 346 were used to study the impact of long-term dust input on ocean productivity and the global carbon cycle,and to test the role of the“iron hypothesis”on a tectonic time scale.The commonly used proxies of paleo-productivity in the Japan Sea include trace elements,biomarkers,biogenic com-ponents and isotope compositions of sediments,and the species and genera of microfossils.On a geological time scale,surface ocean primary productivity in the Japan Sea basically depends on the main nutrients(N,P,Si)and trace nutrients(Fe,Mn,Co,Zn,Cu,etc.)necessary for plankton.Nutrients are mainly carried to the Japan Sea by wind dust,volcanic activity,surface ocean currents and deep currents.Consequently,volcanic activity,East Asian monsoons and westerlies,ocean current evolution,global climate and sea-level change directly or indirectly affect the supply of nutrients and therefore alter the level of primary productivity in the Japan Sea.On a tectonic time scale,the long-term evolution of the paleo-productivity in the Japan Sea and its driving mechanisms(e.g.,the contribution of wind dust,volcanic iron fertilization and ocean currents)are still unclear;regional tectonic evolution,opening and closing of sea channels

关 键 词：日本海 古生产力 古海洋 古气候 国际大洋钻探计划 

分 类 号：P736.2[天文地球—海洋地质]