广西北部湾沉积速率研究

发布时间：2018-02-10 11:47

本文关键词： Cs Pb 分布特征沉积速率北部湾　出处：《广西大学学报(自然科学版)》2017年06期 　论文类型：期刊论文

【摘要】：沉积速率是确定沉积环境演变的重要指标,利用沉积速率讨论海岸带沉积环境是海洋环境研究中的重要手段。文中通过~(137)Cs和~(210)Pb双核素法来研究广西北部湾近海口的现代沉积速率,分析沉积速率的变化与人类活动的关系,简单地探讨了这两种核素在不同环境沉积环境中的可靠性。对广西北部湾典型沉积地区进行了仔细调查,采集并测量了南流江口和三娘湾湾内两个柱状沉积物中~(137)Cs和~(210)Pb_(ex)比活度,根据比活度的垂直分布特征,利用~(137)Cs和~(210)Pb_(ex)计年法分析讨论了广西北部湾的现代沉积速率。结果表明,南流江口(NLJ3柱状样)和三娘湾(SN2柱状样)的现代沉积速率分别为1.039±0.15 cm/a和0.458±0.04 cm/a。~(210)Pb法和~(137)Cs法在两个柱样中均体现了较高的一致性。
[Abstract]:Sedimentation rates are important indicators for determining the evolution of sedimentary environments, Using sedimentation rate to discuss the sedimentary environment of coastal zone is an important means of marine environmental research. In this paper, the modern sedimentation rate of Beibu Gulf near Haikou in Guangxi is studied by means of 137Cs and 210Pb binuclear element method, and the relationship between the variation of sedimentation rate and human activities is analyzed. In this paper, the reliability of these two nuclides in different environments is discussed briefly. The specific activities of 137Cs and PbSX in the two columnar sediments of Nanliu estuary and Sanniangwan have been collected and measured through a careful investigation of typical sedimentary areas in Beibu Bay, Guangxi, China, and the specific activities of Pbstiexexes in the two columnar sediments of Nanliu River Estuary and Sanniangwan have been measured. According to the vertical distribution characteristics of specific activity, the modern sedimentation rate in Beibu Gulf of Guangxi is analyzed and discussed by means of the dating method of 137Cs and 210PbCX. The modern deposition rates of NLJ3 and SN2) are 1.039 卤0.15 cm/a, 0.458 卤0.04 cm/a.~(210)Pb and 137Cs, respectively.
【作者单位】：广西大学物理科学与工程技术学院广西相对论天体物理重点实验室;广西壮族自治区辐射环境监督管理站;
【基金】：国家自然科学基金资助项目(41166002,11665006) 广西自然科学基金资助项目(2012GXNSFFA060005,2016GXNSFAA380142) 广西教育厅科研项目(KY2016YB023)
【分类号】：P736.21

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