...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Asian earth sciences >Soft-sediment Deformation Structures In The Late Quaternary Sediments Of Ladakh: Evidence For Multiple Phases Of Seismic Tremors In The North Western Himalayan Region
【24h】

Soft-sediment Deformation Structures In The Late Quaternary Sediments Of Ladakh: Evidence For Multiple Phases Of Seismic Tremors In The North Western Himalayan Region

机译：拉达克第四纪晚期沉积物中的软沉积变形结构：喜马拉雅西北部地震多期震相的证据

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 exposed Quaternary sections of Ladakh show evidence of seismicity during the late Quaternary. Multiple levels of soft-sediment deformation structures (seismites) are recorded from the Quaternary sediments of the Spituk-Leh, along Indus Suture Zone (ISZ) and the Khalsar palaeolakes, along Shyok Suture Zone (SSZ) and Karakoraum Fault (KF). The studied sections are a part of two major tectonically formed palaeolakes at ～35,000 yr BP. Nine levels of seismites from Spituk-Leh and eight levels from Khalsar sections are recorded. The deformed sediments comprise of clay, silts and sand and are restricted to a single stratigraphic layers bounded by undeformed beds suggesting synsedimentary deformation. The various deformational structures identified are simple and complex convolutes, pinch and swell bedding, microfolds and microfaults, flame-like structures, pseudonodules, clay diapirs, ball and pillow structures, pillar structures, sedimentary dykes and mud lenses. The release of stress along the ISZ, SSZ and KF, may have been responsible for inducing seismicity in the area during the late Quaternary times which may have caused liquefaction as a direct consequence of permanent deformation of ground surface due to earthquakes of large magnitudes (>5 intensity). The chronological data suggests release of stresses along ISZ, SSZ and KF in the form of earthquakes between ～35,000 yr BP to approximately the Last Glacial Maxima (LGM) as evident form the available chronology.
机译：拉达克暴露的第四纪剖面显示了第四纪晚期的地震活动证据。从Spituk-Leh的第四纪沉积物，沿印度河缝线区（ISZ）和Khalsar古湖，沿Shyok缝线区（SSZ）和Karakoraum断层（KF）记录了多级软沉积变形结构（地震岩）。所研究的断层是在〜35,000 yr BP时两个主要构造构造古湖的一部分。记录了Spituk-Leh的9个地震岩层和Khalsar剖面的8个地震岩层。变形的沉积物由粘土，粉砂和沙子组成，并被限制在一个单一的地层中，该地层以未变形的地层为界，暗示着同沉积的变形。识别出的各种变形结构为简单而复杂的回旋形，夹缩和膨胀层理，微褶和微断层，火焰状结构，假结核，黏土，球和枕形结构，柱状结构，沉积堤和泥晶。沿ISZ，SSZ和KF的应力释放可能是在第四纪晚期引起该地区地震活动的原因，这可能是由于大地震引起的地面永久变形的直接结果而导致液化（> 5强度）。年代学数据表明，沿ISZ，SSZ和KF的应力释放是在〜35,000 BP到大约最后冰川最大（LGM）之间发生的地震形式，从可用的年代学上可以明显看出。

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