| 渤海湾西岸QX02孔Ⅱ海的识别及OSL年龄 |
| |
| 引用本文： | 陈永胜,王福,姜兴钰,黎伟麒,李建芬,商志文.渤海湾西岸QX02孔Ⅱ海的识别及OSL年龄[J].地质通报,2016,35(10):1600-1606. |
| |
| 作者姓名： | 陈永胜 王福 姜兴钰 黎伟麒 李建芬 商志文 |
| |
| 作者单位： | 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. 天津师范大学城市与环境科学学院, 天津 300378 |
| |
| 基金项目： | 国家自然科学基金项目（批准号：41476074）和中国地质调查局项目（编号：1212011120169、12120113005800） |
| |
| 摘 要： | 以渤海湾沿海低地的QX02孔为研究对象,进行了沉积岩石学分析和底栖有孔虫统计,结合加速器质谱~(14)C测年和光释光(optically stimulated luminescence,OSL)测年,探讨了该孔记录的第Ⅱ海相层埋深和形成时代。第Ⅱ海相层厚度11.4m,记录相对海面高度-26.83~-15.43m。AMS~(14)C年龄表明,Ⅱ海形成于MIS 3早期、甚至更早。OSL年代学研究显示,Ⅱ海样品等效剂量离散度较高,并且主要集中在2个区间,计算得到新、老2个年龄阶段。基于OSL测年原理的常规判断,认为较老的83.5~62.6ka阶段系受曝光不充分组分的影响,通常采用较年轻的51.9~39.9ka阶段为QX02孔的Ⅱ海沉积年龄。但是,较老的一组年龄从新的视角,暗示了可能的原始沉积过程及相应的海侵发生时间,因而具有重要的年代学和沉积学意义。
|
| 关 键 词： | OSL测年 第Ⅱ海相层 渤海湾西岸 |
| 收稿时间： | 2016/5/19 0:00:00 |
| 修稿时间： | 2016/9/5 0:00:00 |
Identification and OSL ages of the Second Marine Bed in Bore-hole QX02 along the western coast of Bohai Bay |
| |
| CHEN Yongsheng,WANG Fu,JIANG Xingyu,LI Weiqi,LI Jianfen and SHANG Zhiwen.Identification and OSL ages of the Second Marine Bed in Bore-hole QX02 along the western coast of Bohai Bay[J].Geologcal Bulletin OF China,2016,35(10):1600-1606. |
| |
| Authors: | CHEN Yongsheng WANG Fu JIANG Xingyu LI Weiqi LI Jianfen and SHANG Zhiwen |
| |
| Institution: | 1. Tianjin Center, China Geological Survey, Tianjin 300170, China;2. Key Laboratory of Muddy Coast Geo-environment, China Geological Survey, CGS, Tianjin 300170, China;3. Young Sediments Dating Laboratory, Tianjin Institute of Geology and Mineral Resources, Tianjin 300170, China;4. College of Urban and Environmental Science, Tianjin Normal University, Tianjin 300387, China |
| |
| Abstract: | Alternation of marine and terrestrial sediments from Core QX02 along the western coast of Bohai Bay was recognized using lithological characteristics and quantity of benthic foraminifera analysis. Timing of the second marine bed, 11.4m thick, corresponding to a relative sea level of -26.83~-15.43m, was determined by both AMS 14C and OSL dating methods. The AMS 14C dates demonstrated that the second marine bed was deposited during the early Marine Isotope Stage 3 and even earlier. De distribution of typical sediments from the second marine bed was over-dispersed, and two distinct populations could be observed, which yielded a young age range of 51.9~39.9ka, and an old age range of 83.5~62.6ka, respectively. According to the principle of OSL dating, the old fraction obtained from De distribution was limited by the poorly bleaching and, in turn, the fraction of relative young ages was commonly adopted. However, it is plausible to have a clue from the cluster of the older ages that there would be an original sedimentary process and a corresponding timing of marine transgression. |
| |
| Keywords: | OSL dating the Second Marine Bed western coast of Bohai Bay |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《地质通报》浏览原始摘要信息 |
| 点击此处可从《地质通报》下载免费的PDF全文 |
|
