百年来黄河三角洲东北部毗邻海域沉积记录演化及其影响因素

通过对黄河三角洲东北部毗邻海域采集的多个沉积物岩心,开展系统的沉积物粒度、有机碳氮及其同位素特征的分析,结合210Pb年代测定,探讨研究区近百年来高分辨率的沉积记录及其变化的主要因素。研究表明:岩心O3、M2和B63处于相对稳定的沉积环境中,沉积物的粒度分布都呈阶段性变化但表现出差异性,O3和M2自1976年以来沉积物粒度出现粗化,而距离现行河口较近的B63则变细之后粒度粗化,在沉积物的上段C/N和δ13C的变化都反映了陆源有机质输入的增加。黄河1976年改道使三角洲北部和东部海域的沉积环境发生改变,O3和M2受再悬浮泥沙的影响粒度变粗,废弃三角洲叶瓣再悬浮泥沙对研究区的供给量增加,导致O3和...

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Published inHăiyang dĭzhĭ yu dĭsĭjĭ dĭzhĭ Vol. 36; no. 4; p. 29
Main Authors FAN Yongyong, Naishuang, B I, LI Yunhai, WANG Houjie, ZHANG, Yong, XU Congliang, YANG Zuosheng
Format Journal Article
LanguageChinese
Published Beijing Marine Geology and Quaternary Geology 01.01.2016
Subjects
Carbon/nitrogen ratio
Cores
Fluvial sediments
Grain size
High resolution
Lead isotopes
Organic carbon
Organic matter
Particle size
Records
Resolution
Rivers
Sediment
Sediment discharge
Sediments
Temporal variations
Total organic carbon
Yellow River
Online AccessGet full text
ISSN0256-1492
DOI10.16562/j.cnki.0256-1492.2016.04.004

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Abstract 通过对黄河三角洲东北部毗邻海域采集的多个沉积物岩心,开展系统的沉积物粒度、有机碳氮及其同位素特征的分析,结合210Pb年代测定,探讨研究区近百年来高分辨率的沉积记录及其变化的主要因素。研究表明:岩心O3、M2和B63处于相对稳定的沉积环境中,沉积物的粒度分布都呈阶段性变化但表现出差异性,O3和M2自1976年以来沉积物粒度出现粗化,而距离现行河口较近的B63则变细之后粒度粗化,在沉积物的上段C/N和δ13C的变化都反映了陆源有机质输入的增加。黄河1976年改道使三角洲北部和东部海域的沉积环境发生改变,O3和M2受再悬浮泥沙的影响粒度变粗,废弃三角洲叶瓣再悬浮泥沙对研究区的供给量增加,导致O3和M2接受更多陆源有机质的供给。而B63受到更多较细粒黄河入海泥沙影响,粒度变细,陆源有机质输入也增加。黄河入海水沙的阶段性递减和调水调沙工程导致输运至研究区的细粒物质减少,使岩心B63沉积物上段层位的粒度变粗。
AbstractList 通过对黄河三角洲东北部毗邻海域采集的多个沉积物岩心,开展系统的沉积物粒度、有机碳氮及其同位素特征的分析,结合210Pb年代测定,探讨研究区近百年来高分辨率的沉积记录及其变化的主要因素。研究表明:岩心O3、M2和B63处于相对稳定的沉积环境中,沉积物的粒度分布都呈阶段性变化但表现出差异性,O3和M2自1976年以来沉积物粒度出现粗化,而距离现行河口较近的B63则变细之后粒度粗化,在沉积物的上段C/N和δ13C的变化都反映了陆源有机质输入的增加。黄河1976年改道使三角洲北部和东部海域的沉积环境发生改变,O3和M2受再悬浮泥沙的影响粒度变粗,废弃三角洲叶瓣再悬浮泥沙对研究区的供给量增加,导致O3和M2接受更多陆源有机质的供给。而B63受到更多较细粒黄河入海泥沙影响,粒度变细,陆源有机质输入也增加。黄河入海水沙的阶段性递减和调水调沙工程导致输运至研究区的细粒物质减少,使岩心B63沉积物上段层位的粒度变粗。
Author LI Yunhai
YANG Zuosheng
FAN Yongyong
WANG Houjie
ZHANG, Yong
XU Congliang
Naishuang, B I
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Snippet 通过对黄河三角洲东北部毗邻海域采集的多个沉积物岩心,开展系统的沉积物粒度、有机碳氮及其同位素特征的分析,结合210Pb年代测定,探讨研究区近百年来高分辨率的沉积记录及其...
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SubjectTerms Carbon/nitrogen ratio
Cores
Fluvial sediments
Grain size
High resolution
Lead isotopes
Organic carbon
Organic matter
Particle size
Records
Resolution
Rivers
Sediment
Sediment discharge
Sediments
Temporal variations
Total organic carbon
Title 百年来黄河三角洲东北部毗邻海域沉积记录演化及其影响因素
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