渤海湾海岸带地区<sup>137</sup>Cs参考剖面——意义、方法及初步结果

王福; 田立柱; 姜兴钰; 李建芬; 杨彪; 袁海帆; 王宏

渤海湾海岸带地区¹³⁷Cs参考剖面——意义、方法及初步结果

1. 中国地质调查局天津地质调查中心, 天津 300170;
2. 中国地质调查局泥质海岸带地质环境重点实验室, 天津 300170;
3. 天津地质矿产研究所年轻沉积物测年实验室, 天津 300170;
4. 中国地质大学海洋学院, 北京 100083

收稿日期: 2016-05-19

修回日期: 2016-08-22

刊出日期: 2016-10-15

Local ¹³⁷Cs reference profile on Bohai Bay:Implications, methods and initial results

1. Tianjin Center, China Geological Survey, Tianjin 300170, China;
2. Key Laboratory of Muddy Coast Geo-environment, China Geological Survey, Tianjin 300170, China;
3. Young Sediments Dating Laboratory, Tianjin Institute of Geology and Mineral Resources, Tianjin 300170, China;
4. School of Ocean Sciences, China University of Geosciences, Beijing 100083, China

Received Date: 19 May 2016

Revised Date: 22 August 2016

Publish Date: 15 October 2016

摘要

摘要: 海岸带地区近百年来的现代地质过程重建必须以精确的年代学研究为基础，¹³⁷Cs时标法和²¹⁰Pb_exc测年法是目前广泛应用的方法。由于易受到河流沉积物供给变化、潮位状况、极端天气事件等的影响，海岸带现代过程的定量研究一直是高分辨率研究的瓶颈。区域性参考剖面可以提升现代沉积物测年方法在海岸带应用中的可靠性。因此，建立区域性的²¹⁰Pb_exc和¹³⁷Cs比活度-深度参考剖面，将改善对海岸带及邻近海区实测数据的解释。以渤海湾海岸带为研究区，选取沉积环境相对稳定、水平搬运作用较小的地区，采用人工探坑、Eijkelkamp槽型取样器获取了2个柱状岩心，通过γ能谱仪对样品进行²¹⁰Pb、²²⁶Ra及¹³⁷Cs比活度测试，绘制剖面图，结合研究区已有数据，总结出6类海岸带常见的²¹⁰Pb_exc和¹³⁷Cs比活度-深度剖面类型，并重建了渤海湾海岸带¹³⁷Cs区域性参考剖面。结果显示，¹³⁷Cs在渤海湾地区的最大峰值指示1963年，可以作为区域性主要参考时标。但是，最大峰值上部的次峰在不同区域指示不同的时标，S4和S5两个站位该峰值指示的并非1986年时标。
- Pbexc /
- ¹³⁷Cs /
- 参考剖面 /
- 海岸带 /
- 渤海湾
Abstract: Reconstruction of geological processes during the last hundred years needs accurate dating methods. ¹³⁷Cs and ²¹⁰Pb dating methods are widely used at present. As coastal areas are vulnerable to the changes of river sediment supply, the local tidal conditions, and the effects of extreme weather events, the quantitative descriptions of their modern processes have been a bottleneck for the highresolution studies. Regional reference- profiles can help improve the precision of modern sediments dating. If regional ²¹⁰Pb_exc and ¹³⁷Cs reference-profiles could be established, they will play a very positive role in the interpretation of the dating results of modern sediments. In this paper, the relatively stable salt-marsh sites with little transported activity were selected along the coastal areas of Bohai Bay. Based on systematic sampling of trench walls and Eijkelkamp cores, the authors measured the ²¹⁰Pb, ²²⁶Ra and ¹³⁷Cs activities of subsamples by γ spectrometer, combined with the existing data in the study area. Consequently, the local reference-profiles were established, six types of ²¹⁰Pb_exc and ¹³⁷Cs activity-depth profiles were summarized, and the ¹³⁷Cs regional reference-profiles were prelimiarily obtained. ¹³⁷Cs maximum peak in the Bohai Bay is correlated with 1963, which could be used as the main time-marker of the coastal area. However, the second peak above the maximum peak detected in some cores can not be correlated with 1986 but is actually controlled by local environmental factors such as those indiacated at sites S4 and S5.
- Pbexc /
- ¹³⁷Cs /
- reference profiles /
- coast /
- Bohai Bay

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参考文献(31)

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渤海湾海岸带地区137Cs参考剖面——意义、方法及初步结果

1. 中国地质调查局天津地质调查中心, 天津 300170;2. 中国地质调查局泥质海岸带地质环境重点实验室, 天津 300170;3. 天津地质矿产研究所年轻沉积物测年实验室, 天津 300170;4. 中国地质大学海洋学院, 北京 100083

Local 137Cs reference profile on Bohai Bay:Implications, methods and initial results

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渤海湾海岸带地区¹³⁷Cs参考剖面——意义、方法及初步结果

1. 中国地质调查局天津地质调查中心, 天津 300170;
2. 中国地质调查局泥质海岸带地质环境重点实验室, 天津 300170;
3. 天津地质矿产研究所年轻沉积物测年实验室, 天津 300170;
4. 中国地质大学海洋学院, 北京 100083

Local ¹³⁷Cs reference profile on Bohai Bay:Implications, methods and initial results