独流减河盐沼210Pbexc和137Cs剖面记录的现代洪水事件沉积

doi:10.3969/j.issn.1001-909X.2016.02.004

海洋学研究 ›› 2016, Vol. 34 ›› Issue (2): 25-34.DOI: 10.3969/j.issn.1001-909X.2016.02.004

独流减河盐沼²¹⁰Pb_exc和¹³⁷Cs剖面记录的现代洪水事件沉积

杨彪^1,2, 王福^*1,3,4, 田立柱^1,3, 陈永胜^1,3, 姜兴钰^1,3, 王宏^1,3, 胡克², 方晶⁵, 李建芬^1,3, 商志文^1,3

1.中国地质调查局天津地质调查中心,天津 300170;
2.中国地质大学(北京) 海洋学院,北京 100083;
3.中国地质调查局泥质海岸带地质环境重点实验室,天津 300170;
4.天津地质矿产研究所年轻沉积物测年实验室,天津 300170;
5.天津师范大学城市与环境科学学院,天津 300387

收稿日期:2016-02-24 修回日期:2016-03-27 出版日期:2016-06-15 发布日期:2022-11-24
通讯作者: * 王福(1979-),男,副研究员,主要从事现代沉积物测年与海岸带地质环境研究。E-mail:tjwangfu@163.com
作者简介:杨彪(1990-),男,河北沧州市人,主要从事现代沉积物测年与海岸带地质环境研究。E-mail:kantian1218@163.com
基金资助:
国家自然科学基金项目资助(41206069);中国地质调查局百名青年地质英才培养计划项目资助

Deposition of modern flooding events indicated by ²¹⁰Pb_exc and ¹³⁷Cs records from salt marsh of the Duliujian River, Tianjin

YANG Biao^1,2, WANG Fu^*1,3,4, TIAN Li-zhu^1,3, CHEN Yong-sheng^1,3, JIANG Xing-yu^1,3, WANG Hong^1,3, HU Ke², FANG Jing⁵, LI Jian-fen^1,3, SHANG Zhi-wen^1,3

1. Tianjin Centre of Geological Survey, China Geological Survey, Tianjin 300170, China;
2. School of Ocean Sciences, China University of Geosciences, Beijing 100083, China;
3. Key Laboratory of Muddy Coast Geo-environment, China Geological Survey, Tianjin 300170, China;
4. Young Sediments Dating Laboratory, Tianjin Institute of Geology and Mineral Resources, Tianjin 300170, China;
5. College of Urban and Environmental Science, Tianjin Normal University, Tianjin 300387, China

Received:2016-02-24 Revised:2016-03-27 Online:2016-06-15 Published:2022-11-24

摘要/Abstract

摘要： 在独流减河入海口附近河道之间的盐沼采用人工探坑侧壁连续取样,获得2个站位的沉积物样品。通过²¹⁰Pb和¹³⁷Cs定年法建立年代框架,结合粒度分析、有孔虫鉴定和水文数据,探讨了该区的现代洪水事件沉积。结果表明,该区沉积物的²¹⁰Pb_exc比活度-深度剖面中存在2处明显的低值沉积层,分别在3~6 cm和10~14 cm深度,这2个沉积层分别对应¹³⁷Cs曲线的次峰和主峰。这两层与上下相邻层位相比呈现粒径较粗、分选较差,有孔虫丰度较低、破损百分比较高的特征。²¹⁰Pb测年结果显示,¹³⁷Cs曲线下部的主峰对应的年龄为1963年,与全球性的最大峰值形成时间相对应,而上部的次峰对应的并非1986年切尔诺贝利核泄漏事故形成的次峰。区内水文数据显示,在1963和1996年分别发生了2次较大的洪水事件。因此,推断S4和S5站位剖面中2个特殊的沉积层是由洪水事件造成的。本研究说明高分辨率沉积特征的多指标研究可以较为准确地揭示洪水等灾害性事件发生的年代和频率,这有利于系统地揭露海陆过渡带地区地质历史时期灾害和气候事件的频率和强度,为灾害预防和未来规划提供科学依据。

关键词: 洪水沉积, ²¹⁰Pb, ¹³⁷Cs, 粒度, 有孔虫, 渤海湾

Abstract: Sediment samples were collected from two sites in the artificial channel salt marsh of the Duliujian River, through continuous sampling along the side wall of artificial dig pits. The chronology was developed using ²¹⁰Pb and ¹³⁷Cs dating methods, and grain size, foraminifera and hydrologic data were used to study the deposition of modern flooding events. The results show that ²¹⁰Pb_exc activities are obviously lower in 3~6 cm and 10~14 cm layers, corresponding to the main peak and minor peak of ¹³⁷Cs. In addition, comparing with the adjacent layers, these two layers show coarse-grained, poorly sorted, low foraminiferal abundance and high foraminiferal brokenness percentage. The results of ²¹⁰Pb dating show that the main peaks of ¹³⁷Cs was 1963, corresponding to the global ¹³⁷Cs fallout well; however, the minor peaks was not 1986, so it was not caused by the accident of the Chernobyl Reactor. The hydrological data show that there were two flood events in 1963 and 1996 in this area. Therefore, it can be concluded that these two special layers of S4 and S5 sites were caused by the flood events. It is indicated that multi indexes can help to reconstruct flood deposition, which also can help to find disasters and climate events in geological periods, and to provide scientific data for disaster prevention and future plan.

Key words: flood deposit, ²¹⁰Pb, ¹³⁷Cs, grain size, foraminifera, Bohai Bay

中图分类号:

P694
P512.2

杨彪, 王福, 田立柱, 陈永胜, 姜兴钰, 王宏, 胡克, 方晶, 李建芬, 商志文. 独流减河盐沼²¹⁰Pb_exc和¹³⁷Cs剖面记录的现代洪水事件沉积[J]. 海洋学研究, 2016, 34(2): 25-34.

YANG Biao, WANG Fu, TIAN Li-zhu, CHEN Yong-sheng, JIANG Xing-yu, WANG Hong, HU Ke, FANG Jing, LI Jian-fen, SHANG Zhi-wen. Deposition of modern flooding events indicated by ²¹⁰Pb_exc and ¹³⁷Cs records from salt marsh of the Duliujian River, Tianjin[J]. Journal of Marine Sciences, 2016, 34(2): 25-34.

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独流减河盐沼²¹⁰Pb_exc和¹³⁷Cs剖面记录的现代洪水事件沉积

Deposition of modern flooding events indicated by ²¹⁰Pb_exc and ¹³⁷Cs records from salt marsh of the Duliujian River, Tianjin

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