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Article Navigation >  Acta Sedimentologica Sinica  > 2005  >  23(3): 514-522

DUAN Ling-yun, WANG Zhang-hua, LI Mao-tian, PAN Jian-ming, CHEN Zhong-yuan, Yishiki SAITO, Yutaka KANAI. 210 Pb Distr ibution of the Changjiang Estuarine Sediment and the Implications to Sedimentary Environment[J]. Acta Sedimentologica Sinica, 2005, 23(3): 514-522.
Citation: DUAN Ling-yun, WANG Zhang-hua, LI Mao-tian, PAN Jian-ming, CHEN Zhong-yuan, Yishiki SAITO, Yutaka KANAI. 210 Pb Distr ibution of the Changjiang Estuarine Sediment and the Implications to Sedimentary Environment[J]. Acta Sedimentologica Sinica, 2005, 23(3): 514-522.
shu

210 Pb Distr ibution of the Changjiang Estuarine Sediment and the Implications to Sedimentary Environment

  • 1.

    Department of Geography, East China Normal University, Shanghai 200062;

  • 2.

    State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062;

  • 3.

    Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012;

  • 4.

    MRE, Geological Survey of Japan, AIST, Central 7, Higashi 1-1-1,Tsukuba, Ibaraki 306-8567, Japan;

  • 5.

    RCDME, Geological Survey of Japan, AIST, Central 7, Higashi 1-1-1,Tsukuba, Ibaraki 306-8567, Japan

  • Received Date: 2004-10-26
  • Rev Recd Date: 2005-03-17
  • Publish Date: 2005-09-10
  • Eighteen sediment vibrocores, 0.2～6 m long, were collected from the Yangtze estuary in different sedimentary facies, including tidal flat, flood tidal channel, delta front, prodelta and delta-shelf transition zone, to examine the modern depositional characteristics in the study area. Measurement of 210 Pb was performed for all sediment vibrocores and 137Cs app lied for 6 of them. CIC ( constant initial concentration) datingmodelwas used to calculate the sedimentation rate using 210 Pb data. The results obtained show the silty clay and clayey silt in the tidal flat and tidal channel, fine sand and silt in the delta front facies. Fine-grained sediment, mostly the clayey silt, consists of the pro-delta facies, and clay-silt-sand constitutes the delta-shelf transition zone. On the basis of relative continuous sediment record, our radiometric measurement demonstrates that the highest sedimentation rates ( ～2.0 to 6.0 cm /yr) were found in the prodelta facies, reflecting p rocesses of the interface of estuarine mixed water and the seawater. Lower sedimentation rate of 0.81 cm /yr can be recognized form the prodelta margin, but the rate is hardly recorded in the delta-transition zone due to terminatingmodern sedimentation seaward.The higher sedimentation rates (1.03～1.94 cm /yr) occur in the tidal flat of Hengsha Island and Nanhui, and lower ones (0.51～0.76 cm /yr) in the Chongming Island,indicating the southeastward transport of the suspended sediment in the Changjiang estuary. The sedimentation rate in the flood tidal channel is about 0.69～0.86 cm /yr, showing the rapid deposition due to the discrete flood and ebb currents. The sedimentation rates proposed here is of significance to evaluate the sediment budget from the up stream in the past centennial time scale and in particular is to provide an analogue for after Damming study at Three-Gorges
  • [1] 1 范德江,杨作升,郭志刚. 中国陆架210Pb测年应用现状与思考[J].地球科学进展,2000, (03):297-302.

    2 夏小明,谢钦春,李炎. 东海沿岸海底沉积物中的137Cs、210Pb分布及其沉积环境解释[J].东海海洋,1999,(01):20-27.

    3 万国江. 现代沉积的210Pb计年[J].第四纪研究,1997,(03):230-239.

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    9 董永发,丁文鋆. 长江河口沉积物粒度特征与水动力的关系[A].上海:上海科学技术出版社,1988.314-322.

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    12 刘清玉,戴雪荣,何小勤. 崇明东滩环境探讨[J].海洋地质动态,2003,(12):1-4.

    13 潘定安,胡方西,周月琴. 长江河口夏季的盐淡水混合[A].上海:上海科学技术出版社,1988.151-165.

    14 陈中原,周长振,杨文达. 长江口外现代水下地貌与沉积[A].上海:华东师范大学出版社,1987.238-245.

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  • Received:  2004-10-26
  • Revised:  2005-03-17
  • Published:  2005-09-10

210 Pb Distr ibution of the Changjiang Estuarine Sediment and the Implications to Sedimentary Environment

  • 1. Department of Geography, East China Normal University, Shanghai 200062;
  • 2. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062;
  • 3. Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012;
  • 4. MRE, Geological Survey of Japan, AIST, Central 7, Higashi 1-1-1,Tsukuba, Ibaraki 306-8567, Japan;
  • 5. RCDME, Geological Survey of Japan, AIST, Central 7, Higashi 1-1-1,Tsukuba, Ibaraki 306-8567, Japan
  • Received Date: 2004-10-26
  • Rev Recd Date: 2005-03-17
  • Publish Date: 2005-09-10

Abstract: Eighteen sediment vibrocores, 0.2～6 m long, were collected from the Yangtze estuary in different sedimentary facies, including tidal flat, flood tidal channel, delta front, prodelta and delta-shelf transition zone, to examine the modern depositional characteristics in the study area. Measurement of 210 Pb was performed for all sediment vibrocores and 137Cs app lied for 6 of them. CIC ( constant initial concentration) datingmodelwas used to calculate the sedimentation rate using 210 Pb data. The results obtained show the silty clay and clayey silt in the tidal flat and tidal channel, fine sand and silt in the delta front facies. Fine-grained sediment, mostly the clayey silt, consists of the pro-delta facies, and clay-silt-sand constitutes the delta-shelf transition zone. On the basis of relative continuous sediment record, our radiometric measurement demonstrates that the highest sedimentation rates ( ～2.0 to 6.0 cm /yr) were found in the prodelta facies, reflecting p rocesses of the interface of estuarine mixed water and the seawater. Lower sedimentation rate of 0.81 cm /yr can be recognized form the prodelta margin, but the rate is hardly recorded in the delta-transition zone due to terminatingmodern sedimentation seaward.The higher sedimentation rates (1.03～1.94 cm /yr) occur in the tidal flat of Hengsha Island and Nanhui, and lower ones (0.51～0.76 cm /yr) in the Chongming Island,indicating the southeastward transport of the suspended sediment in the Changjiang estuary. The sedimentation rate in the flood tidal channel is about 0.69～0.86 cm /yr, showing the rapid deposition due to the discrete flood and ebb currents. The sedimentation rates proposed here is of significance to evaluate the sediment budget from the up stream in the past centennial time scale and in particular is to provide an analogue for after Damming study at Three-Gorges

DUAN Ling-yun, WANG Zhang-hua, LI Mao-tian, PAN Jian-ming, CHEN Zhong-yuan, Yishiki SAITO, Yutaka KANAI. 210 Pb Distr ibution of the Changjiang Estuarine Sediment and the Implications to Sedimentary Environment[J]. Acta Sedimentologica Sinica, 2005, 23(3): 514-522.
Citation: DUAN Ling-yun, WANG Zhang-hua, LI Mao-tian, PAN Jian-ming, CHEN Zhong-yuan, Yishiki SAITO, Yutaka KANAI. 210 Pb Distr ibution of the Changjiang Estuarine Sediment and the Implications to Sedimentary Environment[J]. Acta Sedimentologica Sinica, 2005, 23(3): 514-522.
shu

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