末次冰消期以来南黄海中部泥质区有机碳埋藏演化记录  

Evolution of Organic Carbon Burial in the Central South Yellow Sea Mud Since the Last Deglaciation

作　　者：李娜[1] 张钰莹 王楠[1] 吴晓[1,2] 叶君 刘喜停 胡利民 LI Na;ZHANG YuYing;WANG Nan;WU Xiao;YE Jun;LIU XiTing;HU LiMin(Key Laboratory of Submarine Geosciences and Technology,MOE,College of Marine Geoscience,Ocean University of China,Qingdao,Shandong 266100,China;Laboratory for Marine Geology,Qingdao National Laboratory for Marine Science and Technology,Qingdao,Shandong 266237,China)

机构地区：[1]中国海洋大学海洋地球科学学院海底科学与探测技术教育部重点实验室,山东青岛266100 [2]青岛海洋科学与技术试点国家实验室海洋地质过程与环境功能实验室,山东青岛266237

出　　处：《沉积学报》2025年第2期513-526,共14页Acta Sedimentologica Sinica

基　　金：中央高校基本科研业务费专项(202241001,202241007);山东省泰山学者工程(TSQN20182117);山东省高等学校“青创团队计划”团队项目(2022KJ045);海底科学与探测技术教育部重点实验室开放基金(SGPT-2022OF-01)。

摘　　要：【目的】陆架—边缘海作为海陆相互作用的关键区域,其沉积物蕴含着气候、海平面变化、生物地球化学循环和人类活动等重要信息。探讨末次冰消期以来沉积环境演化背景下南黄海中部泥质区有机碳埋藏的阶段性特征和影响因素具有重要意义。【方法】对取自该区东侧的H12岩心进行了AMS^(14)C测年、粒度、总有机碳(TOC)、总氮(TN)及稳定碳同位素(δ^(13)C)进行分析。【结果】相对低海平面时期(17~12.6 ka B.P.)发育硬质黏土层,TOC埋藏通量较高,以陆源有机质输入为主。海侵期(12.6~7.8 ka B.P.)受潮流侵蚀等动力作用影响,TOC来源为海陆混合源,陆源TOC埋藏通量在8 ka B.P.左右出现明显高值,对应沉积速率显著升高,可能反映季风驱动下沉积物供应和输送方式变化;高海平面时期(7.8 ka B.P.以来)以海源贡献为主;其中,5~2 ka B.P.,TOC含量在百年尺度上变化幅度较大,与黑潮强度减弱的阶段基本一致,TOC含量的高值整体对应于东亚冬季风的强盛期,可能反映冬季风驱动下黄海暖流的增强导致海洋初级生产力、水体环境的变化,进而对TOC埋藏的影响;~2 ka B.P.以来TOC变化幅度减小,海源有机质贡献整体增加,可能与ENSO(厄尔尼诺—南方涛动)活动的加强有关。【结论】海平面变化是末次冰消期以来南黄海中部有机碳埋藏演化的主控因素,而高海面以来TOC沉积记录阶段性变化可能跟东亚冬季风等影响下黄海暖流的变化及ENSO活动有关。[Objective]Shelf-marginal sea,under land-sea interaction,is a key region with important information regarding climate,sea-level change,biogeochemical cycles,and human activities.To discuss the phased characteristics and influencing factors of organic carbon burial in the background of sedimentary environment evolution since the last deglaciation,[Methods]we analyzed AMS^(14)C dating,the sediment grain size,total organic carbon(TOC),total nitrogen(TN),and stable carbon isotopes(δ^(13)C)of core H12 in the eastern side of central south Yellow Sea mud.[Results]The results show that the hard clay layer developed during the period of relatively low sea level(17-12.6 ka B.P.)with relatively high TOC-MAR(TOC-Mass Accumulation Rate)mainly contributed by terrigenous organic matter.During the transgression period(12.6-7.8 ka B.P.),affected by dynamic effects such as tidal current erosion,TOC originated from mixed terrestrial and marine sources.The terrigenous organic carbon flux shows a significantly high value around 8 ka B.P.,similar to the obviously increasing sedimentation rate,which may be related to the change of sediment transport mode driven by monsoon.During the high sea level period(beginning 7.8 ka B.P.),the main contribution is marine sources.In particular,from 5-2 ka B.P.,the relative variation of TOC content on the centennial scale is large,consistent with the weakening stage of the Kuroshio Current and the strong period of the East Asian winter monsoon,which may reflect the enhancement of Yellow Sea warm current driven by the East Asian winter monsoon,leading to changes in marine primary productivity and water environment and thus affecting the burial of TOC.Since 2 ka B.P.,the variation of TOC content has decreased,and the contribution of organic matter from marine sources has increased,which may be related to the strengthening of ENSO(El Nino-Southern Oscillation)activities.[Conclusions]In conclusion,sea level change is the main controlling factor of organic carbon burial in the central south Yellow Sea si

关 键 词：有机碳埋藏 海平面 黄海暖流 末次冰消期 南黄海 

分 类 号：P532[天文地球—古生物学与地层学]