南黄海江苏岸外潮流沙脊远端沉积与演化

SYS-0702孔位于南黄海江苏岸外潮流沙脊的远端(水深32 m),其最顶部18.64 m岩心对应于潮流沙脊沉积。根据对潮流沙脊沉积物的岩性特征、粒度分析、AMS 14C测年资料和210Pb测试分析,结合通过该孔位的高分辨率浅地层剖面,揭示了该远端沙脊的沉积特征、形成时间以及老黄河从江苏入海(1128-1855年)对沙脊沉积作用的影响。结果表明,该远端沙脊形成于约2.5 cal.kaBP至今,其内部的反射层向东、东北方向倾斜而下超至沙脊的底界面上;沙脊内部的前积反射层倾角一般<0.2°,大多呈上凸形态,与底部的侵蚀界面相切;远端沙脊总体上显示从下至上逐渐变粗的反粒序,砂质沉积物中跃移组分...

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Published inHăiyang dĭzhĭ yu dĭsĭjĭ dĭzhĭ Vol. 31; no. 3; p. 1
Main Authors WEN, Chun, LIU, Jian, ZHANG Junqiang, QIU Jiandong, DIAO Shaobo, Baojing, YUE, SUN, Lisha, KONG Xianghuai
Format Journal Article
LanguageChinese
Published Beijing Marine Geology and Quaternary Geology 01.01.2011
Subjects
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ISSN0256-1492
DOI10.3724/SP.J.1140.2011.03001

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Abstract SYS-0702孔位于南黄海江苏岸外潮流沙脊的远端(水深32 m),其最顶部18.64 m岩心对应于潮流沙脊沉积。根据对潮流沙脊沉积物的岩性特征、粒度分析、AMS 14C测年资料和210Pb测试分析,结合通过该孔位的高分辨率浅地层剖面,揭示了该远端沙脊的沉积特征、形成时间以及老黄河从江苏入海(1128-1855年)对沙脊沉积作用的影响。结果表明,该远端沙脊形成于约2.5 cal.kaBP至今,其内部的反射层向东、东北方向倾斜而下超至沙脊的底界面上;沙脊内部的前积反射层倾角一般<0.2°,大多呈上凸形态,与底部的侵蚀界面相切;远端沙脊总体上显示从下至上逐渐变粗的反粒序,砂质沉积物中跃移组分达到80%以上,悬浮组分不到20%,分选性较好;在老黄河从苏北入海期间(1128-1855年),潮流沙脊远端的沉积速率较之前明显增加,即由0.28~0.77 cm/a增加到1.10 cm/a;在老黄河1855年再次改道入渤海后,沙脊远端的沉积速率明显下降,减少至0.23 cm/a。根据以往的研究,长江古河口湾和苏北东台为辐射状潮流沙脊顶点的发育时间分别为8和6 kaBP,至约2.5 cal.kaBP潮流沙脊由这两处向海进积至SYS-0702孔位所在的远端沙脊,其直线平均进积速率分别为61.7 m/a和65.9 m/a;自2.5 cal.kaBP以来沙脊远端向离岸方向进积的速率大为降低(约4 m/a),可能与深水区潮流作用减弱、沉积物供应减少有关。
AbstractList SYS-0702孔位于南黄海江苏岸外潮流沙脊的远端(水深32 m),其最顶部18.64 m岩心对应于潮流沙脊沉积。根据对潮流沙脊沉积物的岩性特征、粒度分析、AMS 14C测年资料和210Pb测试分析,结合通过该孔位的高分辨率浅地层剖面,揭示了该远端沙脊的沉积特征、形成时间以及老黄河从江苏入海(1128-1855年)对沙脊沉积作用的影响。结果表明,该远端沙脊形成于约2.5 cal.kaBP至今,其内部的反射层向东、东北方向倾斜而下超至沙脊的底界面上;沙脊内部的前积反射层倾角一般<0.2°,大多呈上凸形态,与底部的侵蚀界面相切;远端沙脊总体上显示从下至上逐渐变粗的反粒序,砂质沉积物中跃移组分达到80%以上,悬浮组分不到20%,分选性较好;在老黄河从苏北入海期间(1128-1855年),潮流沙脊远端的沉积速率较之前明显增加,即由0.28~0.77 cm/a增加到1.10 cm/a;在老黄河1855年再次改道入渤海后,沙脊远端的沉积速率明显下降,减少至0.23 cm/a。根据以往的研究,长江古河口湾和苏北东台为辐射状潮流沙脊顶点的发育时间分别为8和6 kaBP,至约2.5 cal.kaBP潮流沙脊由这两处向海进积至SYS-0702孔位所在的远端沙脊,其直线平均进积速率分别为61.7 m/a和65.9 m/a;自2.5 cal.kaBP以来沙脊远端向离岸方向进积的速率大为降低(约4 m/a),可能与深水区潮流作用减弱、沉积物供应减少有关。
Author WEN, Chun
DIAO Shaobo
ZHANG Junqiang
QIU Jiandong
Baojing, YUE
LIU, Jian
SUN, Lisha
KONG Xianghuai
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Snippet SYS-0702孔位于南黄海江苏岸外潮流沙脊的远端(水深32 m),其最顶部18.64 m岩心对应于潮流沙脊沉积。根据对潮流沙脊沉积物的岩性特征、粒度分析、AMS...
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SubjectTerms Estuaries
Estuarine dynamics
Fluvial deposits
Fluvial sediments
Grain size distribution
Lead isotopes
Progradation
Ridges
Rivers
Saltation
Sand
Sediment
Sediment load
Sedimentation
Sedimentation & deposition
Sedimentation rates
Sediments
Seismic analysis
Seismic profiles
Size distribution
Water depth
Title 南黄海江苏岸外潮流沙脊远端沉积与演化
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Volume 31
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