黄海中部泥质区底栖有孔虫群落对早全新世海平面快速上升的响应  

Rapid sea level rise during the Early Holocene in the central Yellow Sea mud area:Evidences from benthic foraminifera

作　　者：钟福昌 向荣[1,2] 杨艺萍 赵美训[4] Zhong Fuchang;Xiang Rong;Yang Yiping;Zhao Meixun(CAS Key Laboratory of Ocean and Marginal Sea Geology,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510301,Guangdong;Innovation Academy of South China Sea Ecology and Environmental Engineering,Chinese Academy of Sciences,Guangzhou 510301,Guangdong;College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049;Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education,Ocean University of China,Qingdao 266100,Shandong)

机构地区：[1]中国科学院南海海洋研究所,中国科学院边缘海与大洋地质重点实验室,广东广州510301 [2]中国科学院南海生态环境工程创新研究院,广东广州510301 [3]中国科学院大学,地球与行星科学学院,北京100049 [4]中国海洋大学,海洋化学理论与工程技术教育部重点实验室,山东青岛266100

出　　处：《第四纪研究》2020年第3期739-750,共12页Quaternary Sciences

基　　金：中国科学院南海生态环境工程创新研究院创新发展基金项目(批准号:ISEE2018PY02)、国家自然科学基金项目(批准号:41876063和41476040);中国科学院(A类)战略性先导科技专项项目(批准号:XDA11030104)共同资助。

摘　　要：末次冰消期以来全球海平面经历了很大变动,本文通过陆架泥质区资料,对黄海中部泥质区5个沉积物柱样进行了AMS 14C年代测试,结合沉积物粒度组成与底栖有孔虫资料探讨黄海中部泥质区底栖有孔虫对早全新世海平面快速上升的响应。结果表明,约13.0 ka以来底栖有孔虫群落对海平面变化的响应呈现明显的3个阶段:早期阶段(约13.0~10.0 ka期间),底栖有孔虫以近岸浅水组合为主,与这一时期海平面相对较低对应,泥质区整体呈滨岸环境,水动力环境较强,有机质等食物供给相对丰富,底栖有孔虫丰度相对较高;中期阶段(约10.0~7.0 ka期间),底栖有孔虫群落几乎消失,可能是由于海平面快速上升,动荡的海洋环境不利于有机质沉降,造成底栖有孔虫食物供给不稳定,不利于底栖有孔虫生存所致;晚期阶段(约7.0 ka以来),底栖有孔虫群落逐渐繁盛,以黄海中部冷水团特征组合为主,反映了区域海平面相对稳定、泥质沉积的形成以及黄海冷水团核心区域的出现等海洋环境变化为底栖有孔虫带来了稳定的有机质供给,故而底栖有孔虫丰度迅速增加到与现在相当的水平。黄海中部泥质区多柱样底栖有孔虫群落变化对早全新世海平面上升有较一致的响应,为该区全新世早期海平面快速上升以及黄海现代环流体系的形成提供了更直接的证据。The global sea level has experienced dramatic changes since the last deglaciation.The studies of these changes can provide important historical information for the study of modern global sea level change.In this study,AMS 14C dating,grain size and benthic foraminiferal analysis were carried on five sediment cores(A02(36°04.45'N,123°11.28'E),A03(35°27.86'N,123°37.92'E),C04(34°58.74'N,123°01.89'E),N04(36°03.84'N,123°44.89'E)and N05(36°03.88'N,124°04.77'E))collected from the central Yellow Sea mud area in the South Yellow Sea,to investigate the response of benthic foraminifera assemblage to rapid sea level rise during the Early Holocene.The results show that the response of benthic foraminifera assemblage to sea level changes can be divided into three stages since 13 thousand years ago(ka).During 13.0~10.0 ka,the total abundance of foraminifera in five cores are all relatively high,which corresponds to correspondingly high percentage content of coarse components(>63μm)in five cores.And the benthic foraminifera assemblages are dominated by coastal shallow water species(Ammonia beccarii var.,Cribrononion subincertum and Elphidium advenum,etc.)in this stage.These archives may indicate a shallow coastal environment with relatively strong hydrodynamics,and relatively rich food supply to benthic foraminifera.During 10.0~7.0 ka,the benthic foraminiferal faunal almost disappeared in the mud area.However,the percentage content of coarse components(>63μm)is still relatively high.These records may be explained by the rapid sea level rise at this period,the turbulent hydrodynamics make it difficult for nutrients such as organic matter to settle on the seabed,resulting in instable food supply to benthic foraminifera,not conducive to the survival of benthic foraminifera.After 7.0 ka,the abundance of benthic foraminifera gradually increased,soon reach to the level as modern Yellow Sea.Benthic foraminiferal faunal are characteristic by typical Yellow Sea cold water mass species,such as Ammonia ketienziensis and Hanzawai

关 键 词：海平面变化 底栖有孔虫 早全新世 黄海中部泥质区 

分 类 号：P722.5[天文地球—海洋科学] Q915.811.1[天文地球—古生物学与地层学]