...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The holocene >The Bengal fan: External controls on the Holocene Active Channel turbidite activity
【24h】

The Bengal fan: External controls on the Holocene Active Channel turbidite activity

机译：孟加拉的风扇：全新世活动通道浊度活动的外部控制

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 eastern levee of the Active Channel in the Bengal fan has been investigated in order to better understand the history of turbidite activity in this channel during the Holocene in the context of Ganges-Brahmaputra source-to-sink' system. A robust C-14-based chronostratigraphy provides high temporal resolution for reconstructing sediment accumulation history on the eastern levee of the Active Channel. Integration of this study with previous work in the area suggests that the Bengal fan has remained continually connected with the Ganges-Brahmaputra fluvial system through the Holocene, feeding through the main canyon, the Swatch of No Ground (SoNG). An intense turbidite activity occurred during a transgressive wet period from 14.5 to 9.2 ka cal. BP, followed by an abrupt shift in sedimentation at 9.2 ka cal. BP, probably due to the high sea level leading to a partial disconnection between massive river discharges and the deep turbidite system. During the last 9.2 ka cal. BP, turbidite activity is still present but irregular, likely modulated by a combination of various forcings such as monsoon variability and river migration. In total, three phases are distinguishable during this period: 9.2-5.5, 5.5-4, and 4 ka cal. BP to modern, according to the turbidite record. Unexpectedly, the Indo-Asian monsoon does not appear to be the only predominant forcing on the establishment of the Bengal fan during the Holocene because of the combination of different forcings directly affecting transfers between the Ganges-Brahmaputra and the Bengal fan as well as river migrations, delta construction, and potentially anthropogenic impact.
机译：为了更好地了解恒河-布拉马普特拉源到汇系统中的全新世期间该通道浊度活动的历史，对孟加拉扇活动通道的东堤进行了调查。强大的基于C-14的年代地层学为重建活动通道东堤上的沉积物沉积历史提供了高时间分辨率。这项研究与该地区以前的工作相结合，表明孟加拉扇通过全新世不断与恒河-布拉马普特拉河系保持联系，并穿过主要峡谷无地面样本（SoNG）。在从14.5到9.2 ka cal的海侵湿润时期，发生了强烈的浑浊活动。 BP，随后在9.2 ka cal处突然发生沉降变化。 BP，可能是由于海平面高导致大量河水排放与深浊度系统之间的部分断开。在最后9.2 ka cal中。 BP，浊石活动仍然存在，但不规则，可能受季风变化和河流迁移等各种强迫因素的组合而调节。在此期间，总共可以区分三个阶段：9.2-5.5、5.5-4和4 ka cal。根据浊度记录，BP到了现代。出乎意料的是，在全新世期间，印度-亚洲季风似乎并不是孟加拉扇建立的唯一主要强迫因素，因为不同的强迫作用直接影响了恒河-布拉马普特拉河与孟加拉扇之间的转移以及河流迁移，三角洲建设以及潜在的人为影响。

著录项

  • 来源
    《The holocene》 |2017年第6期|900-913|共14页
  • 作者

    Fournier Lea; Fauquembergue Kelly; Zaragosi Sebastien; Zorzi Coralie; Malaize Bruno; Bassinot Franck; Joussain Ronan; Colin Christophe; Moreno Eva; Leparmentier Francois;

  • 作者单位

    Univ Bordeaux, UMR CNRS EPOC 5805, Batiment B18, F-33615 Bordeaux, France;

    Univ Bordeaux, UMR CNRS EPOC 5805, Batiment B18, F-33615 Bordeaux, France;

    Univ Bordeaux, UMR CNRS EPOC 5805, Batiment B18, F-33615 Bordeaux, France;

    Univ Quebec Montreal, Dept Earth & Atmospher Sci, Montreal, PQ, Canada;

    Univ Bordeaux, UMR CNRS EPOC 5805, Batiment B18, F-33615 Bordeaux, France;

    CNRS CEA UVSQ, UMR 8212, Lab Sci Climat & Environm LSCE IPSL, Gif Sur Yvette, France;

    Tongji Univ, State Key Lab Marine Geol, Shanghai, Peoples R China|Univ Paris Saclay, CNRS, Univ Paris Sud, GEOPS, Paris, France;

    Univ Paris Saclay, CNRS, Univ Paris Sud, GEOPS, Paris, France;

    Sorbonne Univ, MNHN, Inst Sci Terre Paris iSTeP, Paris, France;

    TOTAL SA, Div Projets Nouveaux, Direct Explorat, Dept Bassins & Themat Frontieres, Puteaux La Defense, France;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Bengal fan; Holocene; Indo-Asian monsoon; river migration; sea level; turbidite activity;

    机译：孟加拉扇;全新世;印亚季风;河流迁移;海平面;浊度活动;

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