| 现代长江口的形成及末次冰消期以来沉积环境演变 |
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| 引用本文： | 张丹,王张华,李卫康,李晓.现代长江口的形成及末次冰消期以来沉积环境演变[J].海洋地质与第四纪地质,2010(2). |
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| 作者姓名： | 张丹 王张华 李卫康 李晓 |
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| 作者单位： | 华东师范大学地理系;台湾中山大学海洋地质化学研究所;上海市地质调查研究院; |
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| 基金项目： | 国家自然科学基金项目(J0730534);;国土资源部和上海市合作项目“上海市三维城市地质调查”(200413000020) |
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| 摘 要： | 利用在长江口崇明岛获得的一个第四纪钻孔,对中更新世末以来的沉积物进行了OSL、14C测年,在此基础上进行岩性、微体古生物和孢粉分析,以探讨现代长江口形成的基础以及末次冰消期以来在气候-海平面波动控制下河口沉积环境的演变。研究结果显示,本孔所在地中更新世末处于湖沼环境,但晚更新世一直以河流环境为主,且主要发育末次冰期的河道滞留相沉积。在此基础上,随着末次冰消期海平面的上升,先后发育了河口湾和三角洲沉积体系。末次冰消期的海平面快速上升在本孔沉积物记录中体现为微体古生物化石较丰富,潮流作用显著。全新世早期长江口堆积速率明显高于全新世中晚期,应当反映了温暖湿润的季风气候条件下入海泥沙非常丰富。
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| 关 键 词： | 末次冰期 末次冰消期 沉积环境 长江口 |
FORMATION OF MODERN YANGTZE ESTUARY AND SEDIMENTARY ENVIRONMENTAL EVOLUTION SINCE THE LAST DEGLACIATION |
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| ZHANG Dan,WANG Zhanghua,LI Weikang,LI Xiao.FORMATION OF MODERN YANGTZE ESTUARY AND SEDIMENTARY ENVIRONMENTAL EVOLUTION SINCE THE LAST DEGLACIATION[J].Marine Geology & Quaternary Geology,2010(2). |
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| Authors: | ZHANG Dan WANG Zhanghua LI Weikang LI Xiao |
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| Institution: | 1 Department of Geography;East China Normal University;Shanghai 200062;China;2 Institute of Marine Geology and Chemistry of National Sun Yat-sen University;Kaohsiung Taiwan 80424;3 Shanghai Geological Survey;Shanghai 200072;China |
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| Abstract: | The present study measured OSL and 14C ages for late Quaternary sediments in a borehole drilled in the Chongming Island,Yangtze estuary.Lithology,microfossils,and sporopollen were further analyzed to discuss the formation of the modern Yangtze estuary and sedimentary environmental changes since the last deglaciation.The results indicate a lacustrine and marsh environment at the end of mid-Pleistocene.Fluvial facies dominates during late Pleistocene,especially gravel sediments of the riverbed prevailed durin... |
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| Keywords: | sedimentary environment last glaciation last deglaciation Yangtze estuary |
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