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| 近百年来长江口外泥质区高分辨率的沉积记录及影响因素探讨 | |
| 引用本文： | 王昕,石学法,刘升发,王国庆,乔淑卿,朱爱美,高晶晶.近百年来长江口外泥质区高分辨率的沉积记录及影响因素探讨[J].沉积学报,2012,30(1):148-157. |
| 作者姓名： | 王昕 石学法 刘升发 王国庆 乔淑卿 朱爱美 高晶晶 |
| 作者单位： | 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／海洋沉积与环境地质国家海洋局重点实验室国家海洋局第一海洋研究所,山东青岛266061／中国科学院研究生院,北京100049 2. 海洋沉积与环境地质国家海洋局重点实验室国家海洋局第一海洋研究所,山东青岛,266061 3. 中国地质大学地球科学学院,武汉,430074 |
| 摘 要： | 通过对长江口外泥质区ZM11柱样的粒度和常微量元素分析,结合210Pb年代测定,探讨了研究区近百年来的沉积历史及影响因素。研究表明,ZM11柱样1950年以来平均沉积速率约为2.5 cm/a;受长江深水航道建设以及水下三角洲前缘侵蚀的影响,近十年来ZM11柱样沉积速率仍然保持3 cm/a以上;46 cm处0.3 cm厚的细砂层记录了1998年特大洪水事件,1998—1999年前后ZM11柱样沉积厚度高达20 cm。ZM11柱样沉积物物质成分较为均一,以粉砂为主;近百年来粒度变化与大通站泥沙粒径变化趋势不尽相同,可能主要受水下三角洲沉积环境控制。元素分析结果表明ZM11柱样沉积物物源比较稳定,基本来自长江物质输入,影响岩芯沉积物元素含量变化的因素主要有沉积物粒度组成、长江碎屑物质输入、生物作用以及人类活动。 |
| 关 键 词： | 粒度 元素 长江 输沙 人类活动 |
High Resolution Sedimentary Record Within a Hundred Years on the Mud Area Near the Changjiang Estuary and Discussion of Its Impacting Factors |
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| WANG Xin,SHI Xue-fa,LIU Sheng-fa,WANG Guo-qing,QIAO Shu-qing,ZHU Ai-mei,GAO Jing-jing.High Resolution Sedimentary Record Within a Hundred Years on the Mud Area Near the Changjiang Estuary and Discussion of Its Impacting Factors[J].Acta Sedimentologica Sinica,2012,30(1):148-157. | |
| Authors: | WANG Xin SHI Xue-fa LIU Sheng-fa WANG Guo-qing QIAO Shu-qing ZHU Ai-mei GAO Jing-jing |
| Institution: | 1.Key Laboratory of Marine Geology and Environment,Institute of Oceanology,Chinese Academy Sciences,Qingdao,Shandong 266071; 2.Key Laboratory of State Oceanic Administration for Marine Sedimentology & Environmental Geology, First Institute of Oceanography,State Oceanic Administration,Qingdao,Shandong 266061; 3.Graduate School,Chinese Academy of Sciences,Beijing 100039; 4.Faculty of Earth Science,China University of Geosciences,Wuhan 430074) |
| Abstract: | Based on the major and trace elements and grain-size analysis,as well as the 210Pb isotope data,the sedimentary history within a hundred year of the Core ZM11 was reconstructed and the impacting factors were discussed.It was shown that the sedimentation rate is about 2.5 cm/a starting from 1950.Because the sediment was dredged during the construction of the Twin Jetty-Groyne Complex in the North Passage of the South Channel and was eroded from delta front,the sedimentation rate of the Core ZM11 within the last ten years was above 3 cm/a,while the Changjiang sediment was declining during the same period.The thickness of sediment deposited during 1998-1999 was about 20 cm,possibly induced by the 1998 major flood event that is recognized by the 0.3 cm fine-sand layer at ~ 46 cm depth.The variation of the sediment grain size in Core ZM11,presumably controlled by the complexity of subaqueous delta,is not consistent with the sediment grain size variations of the Datong gauging station.The geochemical element analysis results showed that sediment of Core ZM11 mainly come from the Changjiang River.Grain size,terrigenous material input,biological sedimentation and human activity are the major factors that resulted the element content variations of the Core ZM11. |
| Keywords: | grain size element Changjiang suspended material supply human activity |
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