长江河口水下三角洲210Pb分布特征及其沉积速率

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长江河口水下三角洲210Pb分布特征及其沉积速率

张瑞

南京大学海岸与海岛开发教育部重点实验室南京 210093

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Sedimentation Rates and Characteristics of Radionuclide 210Pb at the Subaqueous Delta in Changjiang EstuaryMOE

ZHANG Rui

Key Laboratory of Coast and Island Development, Nanjing University, Nanjing 210093

摘要

摘要: 通过对长江水下三角洲采集的十个沉积物柱状样中的放射性核素210Pb分析得知，长江水下三角洲表层210Pb放射性比度在2.15~4.22 dpm·g-1之间，210Pb沉降通量在1.50~11.21 dpm·cm-2 yr-1之间，过剩210Pb总量在>48.29~>361.68 dpm·cm-2之间；210Pb沉降通量以及过剩210Pb总量均高于理论值，这表明在沉积物中存在210Pb的净输入和聚集。由210Pb放射性比度剖面所反映的沉积速率可知长江水下三角洲泥质沉积区沉积速率介于1.36~4.11 cm·yr-1之间；总体上呈现近岸沉积速率较低，沿31°N纬线向20 m等深线沉积速率升高的趋势，从122°15′E到122°30′E范围为长江水下三角洲的泥质沉积物堆积中心，其平均沉积速率为3.51 cm·yr-1。
- 沉积速率 /
- 沉积通量 /
- 过剩210Pb总量 /
- 长江口 /
- 水下三角洲
Abstract: The 10 sediment cores were collected from subaqueous delta of Changjiang estuary in April 2006, using the gravity coring equipment. The length of the cores varied from 100 to 160cm. Following visual inspection for geological parameters and photography of the cores, they were subsampled at 2 cm intervals for the entire length of the cores. Profiles of 210Pb measured in 10 sediment cores were analyzed to elucidate the sediment rates as well as the characteristics of 210Pb. 210Pb (via 210Po) was determined by αspectrometry. Distribution of sedimentation rates reveals that during the last 100 years, the derived sedimentation rates vary from 1.36 to 4.11 cm·yr1, and generally increase seaward the 20m isobaths. In addition, the region from 122°15′E to 122°30′E, i.e. from cores SC05 to SC11, is considered as the mud depocenter in Changjiang estuary, with the mean sediment rates of 3.51cm·yr1. This pattern could coincide with the dispersal of Changjiang Riverderived sediments, with influence by the current and tidal systems. The 210Pb activities of the surfacial sediment vary from 2.15 to 4.22dpm·g1, and 210Pb deposition fluxes from 1.50 to 11.21dpm·cm2·yr1, as well as excess 210Pb inventories between >48.29 and >361.68dpm·cm2, respectively. The excess 210Pb inventories appear to be higher than the theoretical inventory at the subaqueous delta of Changjiang estuary. It is indicated that besides the atmospheric 210Pb fallout, the fluvial inputs could play an important role, whilst the much riverine sediment discharges may be scavenged and deposited at the subaqueous delta of Changjiang estuary.
- sedimentation rate /
- sediment flux /
- excess 210Pb inventory /
- Changjiang estuary /
- subaqueous delta

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[1]	谢津剑, 王爱军, 叶翔, 陶舒琴, 蔡枫. 闽江河口水下三角洲及周边海域现代沉积环境演化及其对人类活动的响应 . 沉积学报, 2024, 42(2): 558-574. doi: 10.14027/j.issn.1000-0550.2022.058
[2]	高抒. 南京地区早三叠世碳酸盐沉积动力过程初探 . 沉积学报, 2023, 41(6): 1673-1680. doi: 10.14027/j.issn.1000-0550.2023.124
[3]	王新航, 汪银奎, 旦增平措, 巴桑曲珍, 韩中鹏. 陆相流域盆地沉积通量模拟及古地貌意义——以西藏尼玛地区为例 . 沉积学报, 2022, 40(4): 912-923. doi: 10.14027/j.issn.1000-0550.2021.143
[4]	金秉福, 党丽丽, 孔庆祥, 王孟瑶, 岳伟, 樊水淼. 黄河和长江沉积角闪石亲石元素地球化学特征对比与物源辨识 . 沉积学报, 2022, 40(1): 149-165. doi: 10.14027/j.issn.1000-0550.2020.098
[5]	林镇坤, 王爱军, 叶翔. 南流江河口水下三角洲表层沉积物端元分析及其沉积动力环境意义 . 沉积学报, 2019, 37(1): 124-134. doi: 10.14027/j.issn.1000-0550.2018.113
[6]	马丽芳, 鲍晶, 应红, 胡春华, 钟思锐, 杨淑芬, 宋春晖, 孟庆泉. 祁连山北缘酒西盆地新生代沉积通量变化对周缘山体构造隆升—风化剥蚀历史的响应 . 沉积学报, 2016, 34(1): 49-57. doi: 10.14027/j.cnki.cjxb.2016.01.004
[7]	. 长江水下三角洲向南延伸泥质带浅地层结构及沉积物特征初探——以朱家尖岛以东海域为例 . 沉积学报, 2014, 32(2): 296-305.
[8]	王永红. 长江河口涨落潮槽沉积物特征及其动力响应 . 沉积学报, 2009, 27(3): 511-516.
[9]	薛春汀. 西汉末—北宋黄河三角洲（公元11～1099年）的沉积记录 . 沉积学报, 2008, 26(5): 804-812.
[10]	刘红. 波流共同作用下潮滩剖面沉积物和地貌分异规律——以长江口崇明东滩为例 . 沉积学报, 2008, 26(5): 833-843.
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[15]	韩晓非, 张卫国, 陈满荣, 俞立中. 长江口潮滩植物对沉积物铁的地球化学循环及磁性特征的影响 . 沉积学报, 2003, 21(3): 495-499.
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长江河口水下三角洲210Pb分布特征及其沉积速率

南京大学海岸与海岛开发教育部重点实验室南京 210093

收稿日期: 1900-01-01

修回日期: 1900-01-01

刊出日期: 2009-08-10

关键词:

长江口 /

摘要: 通过对长江水下三角洲采集的十个沉积物柱状样中的放射性核素210Pb分析得知，长江水下三角洲表层210Pb放射性比度在2.15~4.22 dpm·g-1之间，210Pb沉降通量在1.50~11.21 dpm·cm-2 yr-1之间，过剩210Pb总量在>48.29~>361.68 dpm·cm-2之间；210Pb沉降通量以及过剩210Pb总量均高于理论值，这表明在沉积物中存在210Pb的净输入和聚集。由210Pb放射性比度剖面所反映的沉积速率可知长江水下三角洲泥质沉积区沉积速率介于1.36~4.11 cm·yr-1之间；总体上呈现近岸沉积速率较低，沿31°N纬线向20 m等深线沉积速率升高的趋势，从122°15′E到122°30′E范围为长江水下三角洲的泥质沉积物堆积中心，其平均沉积速率为3.51 cm·yr-1。

Sedimentation Rates and Characteristics of Radionuclide 210Pb at the Subaqueous Delta in Changjiang EstuaryMOE

Key Laboratory of Coast and Island Development, Nanjing University, Nanjing 210093

Received Date: 1900-01-01

Rev Recd Date: 1900-01-01

Publish Date: 2009-08-10

Keywords:

Abstract: The 10 sediment cores were collected from subaqueous delta of Changjiang estuary in April 2006, using the gravity coring equipment. The length of the cores varied from 100 to 160cm. Following visual inspection for geological parameters and photography of the cores, they were subsampled at 2 cm intervals for the entire length of the cores. Profiles of 210Pb measured in 10 sediment cores were analyzed to elucidate the sediment rates as well as the characteristics of 210Pb. 210Pb (via 210Po) was determined by αspectrometry. Distribution of sedimentation rates reveals that during the last 100 years, the derived sedimentation rates vary from 1.36 to 4.11 cm·yr1, and generally increase seaward the 20m isobaths. In addition, the region from 122°15′E to 122°30′E, i.e. from cores SC05 to SC11, is considered as the mud depocenter in Changjiang estuary, with the mean sediment rates of 3.51cm·yr1. This pattern could coincide with the dispersal of Changjiang Riverderived sediments, with influence by the current and tidal systems. The 210Pb activities of the surfacial sediment vary from 2.15 to 4.22dpm·g1, and 210Pb deposition fluxes from 1.50 to 11.21dpm·cm2·yr1, as well as excess 210Pb inventories between >48.29 and >361.68dpm·cm2, respectively. The excess 210Pb inventories appear to be higher than the theoretical inventory at the subaqueous delta of Changjiang estuary. It is indicated that besides the atmospheric 210Pb fallout, the fluvial inputs could play an important role, whilst the much riverine sediment discharges may be scavenged and deposited at the subaqueous delta of Changjiang estuary.

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长江河口水下三角洲210Pb分布特征及其沉积速率

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Sedimentation Rates and Characteristics of Radionuclide 210Pb at the Subaqueous Delta in Changjiang EstuaryMOE

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长江河口水下三角洲210Pb分布特征及其沉积速率

南京大学海岸与海岛开发教育部重点实验室南京 210093

English Abstract

Sedimentation Rates and Characteristics of Radionuclide 210Pb at the Subaqueous Delta in Changjiang EstuaryMOE

Key Laboratory of Coast and Island Development, Nanjing University, Nanjing 210093

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长江河口水下三角洲210Pb分布特征及其沉积速率

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Sedimentation Rates and Characteristics of Radionuclide 210Pb at the Subaqueous Delta in Changjiang EstuaryMOE

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出版历程

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长江河口水下三角洲210Pb分布特征及其沉积速率

南京大学海岸与海岛开发教育部重点实验室 南京 210093

English Abstract

Sedimentation Rates and Characteristics of Radionuclide 210Pb at the Subaqueous Delta in Changjiang EstuaryMOE

Key Laboratory of Coast and Island Development, Nanjing University, Nanjing 210093

全文HTML

目录

友情链接

期刊在线

联系我们

南京大学海岸与海岛开发教育部重点实验室南京 210093