...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>海洋調查技術 >Formation of miho peninsula and continental shelf off the peninsula interpreted by depositional sequence
【24h】

Formation of miho peninsula and continental shelf off the peninsula interpreted by depositional sequence

机译：沉积序列解释了美荷半岛的形成和半岛外的大陆架

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

The formation and depositional environments of the sedimentary sequences on the continental shelf off the Miho Peninsula, Central Japan, are studied in detail on the basis of the geomorphology, surface sediment distribution, and acoustic stratigraphy. Sequential analysis based on seismic reflection records defines an acoustic stratigraphy for the region. Acoustic units are A 0, A 1, A 2 and B in descending order. Units A 0, A 1 and A 2 are considered to be parasequences, and unit B acoustic basement. The boundaries of these units are carefully examined and found to be classified as interpeted to be marine flooding surface (mf), maximum flooding surface (mfs), and major erosional surface (sequence boundary; SB). Studies on internal sedimentary structure of each acoustic unit and sediment distribution pattern shown by the isopach maps clearly indicate major changes in sedimentary environment through these units. A series of isopach map indicates northward and also landward (westward) migrations of depositional centers of the shelf sediments. It is found that these changes in depositional environments are closely related with the sea-level fluctuations during last 18,000 years. Correlation between the acoustic stratigraphy on the shelf and boring cores located on the peninsula provides not only lithological confirmation and environmental constraints on the acoustic units but also time scale for the reconstruction of sedimentary/erosional history of the area. Sea-level analysis on the basis of the published sea-level fluctuation curves for the Tokai and Kanto districts shows intimate relation between acoustic stratigraphy and sea-level fluctuations. Reflectors L,K,J,I demarcate Units, B, A 2, A 1, A 0 on the continental shelf off the Moho Peninsula. Reflector L is correlated with 18,000 yBP, Reflector K with 10,000 approx 9,000 yBP, and Reflector I with 7,500 yBP. These correlations do not conflict with the dating from boring core data. Three stages are proposed in terms of formation of acoustic units and submarine spit platforms on the shelf. By the time of about 10,000-9,000 yBP. The unit B was formed and has been a widespread foundation of submarine spit platforms. About 7,500 yBP., the first and second submarine spit platforms were constructed by accumulation of the A 1 and A 2 units. After 6,000 yBP., the third submarine spit and the Miho Peninsula were formed by accumulation of the unit A 0. Migrations or shifts of the acoustic units are found to be closely related with sea-level rise.
机译：根据地貌，地表沉积物分布和声学地层学，详细研究了日本中部美穗半岛附近大陆架上沉积序列的形成和沉积环境。基于地震反射记录的顺序分析定义了该地区的地层。声学单位按降序为A 0，A 1，A 2和B。单元A 0，A 1和A 2被认为是副序列，而单元B则是声学基础。仔细检查了这些单元的边界，发现它们被划分为海洋洪泛面（mf），最大洪泛面（mfs）和主要侵蚀面（序列边界; SB）。对每个声学单元内部沉积结构和等渗线图显示的沉积物分布模式的研究清楚地表明，通过这些单元，沉积环境发生了重大变化。一系列等渗线图指示了陆架沉积物沉积中心向北以及向陆（向西）的迁移。发现沉积环境的这些变化与最近18,000年中的海平面波动密切相关。架子上的声学地层与位于半岛上的钻孔岩心之间的相关性不仅为声学单元提供了岩性确认和环境限制，而且还为重建该地区的沉积/侵蚀历史提供了时间尺度。根据已发布的东海和关东地区海平面波动曲线进行的海平面分析表明，声学地层学与海平面波动之间存在密切的关系。反射镜L，K，J，I在Moho半岛外的大陆架上划定了B，A 2，A 1，A 0单位。反射器L与18,000 yBP相关，反射器K与10,000约9,000 yBP相关，反射器I与7,500 yBP相关。这些相关性与无聊的核心数据的日期没有冲突。根据在架子上的声学单元和海底吐水平台的形成，提出了三个阶段。到大约10,000-9,000 yBP时。 B单位已经形成，并且已经成为海底吐水平台的广泛基础。通过积累A 1和A 2单元，建造了大约7500 yBP。的第一和第二海底吐水平台。在6,000 yBP。之后，第三海底吐痰和Miho半岛是由A 0的堆积形成的。声学单位的迁移或移动与海平面的上升密切相关。

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