...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Quaternary geochronology >OSL chronology and accumulation rate of the Nakdong deltaic sediments, southeastern Korean Peninsula
【24h】

OSL chronology and accumulation rate of the Nakdong deltaic sediments, southeastern Korean Peninsula

机译：朝鲜半岛东南部洛东三角洲沉积物的OSL年表和累积速率

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Optically stimulated luminescence (OSL) dating was performed on Late Quaternary deltaic sequences from a 55-m-long core sampled from the Nakdong River estuary, Korea. OSL ages obtained from chemically separated fine (4-11 mu m) and coarse (90-212 mu m) quartz grains ranged from 29.4 +/- 2.6 to 0.4 +/- 0.04 ka, revealing clear consistency between the grain-size fractions. The D-e values from the standardized growth curve (SGC) are consistent with those from the single-aliquot regenerative-dose (SAR) procedure, which suggests that the SGC is valid for the Nakdong deltaic sediments. The C-14 ages of shells and wood fragments ranged from 11 to 2.9 ka, demonstrating reasonable agreement with the OSL ages, within the error range. However, the limited number and random sampling interval of the C-14 age data (10 ages) result in a simple linear and exponential trend in the depth age curve. In contrast, OSL ages obtained by high-resolution sampling show down-section variations in the depth age curve, indicating the occurrence of rapid changes in sedimentation rate. It is suggested that the high-sampling-resolution OSL ages provide a more realistic and detailed depth age curve and sedimentation rate. The Nakdong deltaic sediments were divided into five units based on sedimentation rate. The lowest (unit 5) shows a break in sedimentation between the last glacial maximum (LGM) and the Holocene. The sedimentation rate increased in units 4 and 3, presumably corresponding to the early to middle Holocene sea level rise and high stand. Unit 2 shows a gradually decreasing sedimentation rate following the regression of the shoreline, until about 2 ka. The progradation of the Nakdong River delta resulted in the rapid accumulation of unit 1 during the last 2000 years. (C) 2015 Elsevier B.V. All rights reserved.
机译：对来自韩国那洞河河口的55米长岩心的第四纪晚期三角洲序列进行了光激发发光（OSL）测年。从化学分离的细（4-11微米）和粗（90-212微米）石英晶粒获得的OSL年龄范围为29.4 +/- 2.6至0.4 +/- 0.04 ka，显示出各个粒度级分之间清晰的一致性。标准化生长曲线（SGC）的D-e值与单等分再生剂量（SAR）程序的D-e值一致，这表明SGC对洛东三角洲沉积物有效。贝壳和木头碎片的C-14年龄范围为11至2.9 ka，这表明与OSL年龄的合理吻合在误差范围内。但是，C-14年龄数据的有限数量和随机采样间隔（10个年龄）导致深度年龄曲线出现简单的线性和指数趋势。相反，通过高分辨率采样获得的OSL年龄在深度年龄曲线中显示出下部变化，表明发生了沉积速率的快速变化。建议使用高采样分辨率的OSL年龄可以提供更真实，更详细的深度年龄曲线和沉降速率。洛东三角洲沉积物根据沉积速率分为五个单元。最低的（第5单元）显示出末次冰期最大值（LGM）和全新世之间的沉积破裂。沉积速率在第4和第3单元增加，大概对应于全新世初期到中期海平面上升和高位。单元2显示，随着海岸线的回归，沉积速率逐渐降低，直到大约2 ka。那空河三角洲的发展导致最近1年中1号机组的迅速积累。 （C）2015 Elsevier B.V.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号