...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Frontiers of earth science >Regression-transgression cycles of paleolakes in the Fen River Graben Basin during the mid to late Quaternary and their tectonic implication
【24h】

Regression-transgression cycles of paleolakes in the Fen River Graben Basin during the mid to late Quaternary and their tectonic implication

机译：F河格拉本盆地第四纪中晚期的古湖退-海侵周期及其构造意义

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

An investigation into lake terraces and their sedimentary features in the Fen River Graben Basin shows that several paleolake regression-transgression cycles took place during the mid to late Quaternary. The horizontal distribution of the lowest loess/paleosol unit overlying each lake terrace indicates the occurrence of four rapid lake regressions when paleosols S-8, S-5, S-2, and S-1 began to develop. The horizontal distribution of the topmost loess/ paleosol unit underlying the lacustrine sediment in each transition zone between two adjacent terraces indicates that following a lake regression, a very slow lake transgression occurred. The durations of three lake transgressions correspond to those of the deposition or development of loess/paleosols L-8 to L-6, L-5 to L-3, and L-2. It is thereby inferred that regional tectonic movement is likely the primary factor resulting in the cyclical process of paleolake regressions and transgressions. Taking these findings along with published geophysical research results regarding the upper mantle movements underneath the graben basin into account, this paper deduces that a cause and effect relationship may exist between the paleolake regression-transgression cycles and the tectonic activity in the upper mantle. The occurrence of a rapid lake regression implies that the upwelling of the upper mantle underneath the graben basin may be dominant and resulting in a rapid uplifting of the basin floor. The subsequent slow lake transgression implies that the thinning of the crust and cooling of the warm mantle material underneath the graben basin may become dominant causing the basin floor to subside slowly. Four rapid paleolake regressions indicate that four episodic tectonic movements took place in the graben basin during the mid to late Quaternary.
机译：对the河格拉本盆地的湖泊阶地及其沉积特征进行的调查表明，在第四纪中期至晚期发生了几次古湖退-海退循环。覆盖每个湖阶的最低黄土/古土壤单元的水平分布表明，古土壤S-8，S-5，S-2和S-1开始发育时，发生了四个快速的湖退。在两个相邻阶地之间的每个过渡带中，湖相沉积物之下的最上层黄土/古土壤单元的水平分布表明，在湖泊退缩之后，发生了非常缓慢的湖泊越境活动。三种湖泊越境活动的持续时间对应于黄土/古土壤L-8至L-6，L-5至L-3和L-2的沉积或发育。由此推断，区域构造运动可能是导致古湖退缩和海侵循环过程的主要因素。考虑到这些发现以及已发表的关于grab斗盆地下地幔运动的地球物理研究结果，本文推论出古湖的回归-海侵周期与上地幔构造活动之间可能存在因果关系。湖泊快速退缩的发生暗示着被占领盆地下方上地幔的上升可能占主导地位，并导致盆地底面迅速抬升。随后缓慢的海侵活动表明，grab陷盆地下面的地壳变薄和温暖地幔物质的冷却可能占主导地位，导致盆地底部缓慢沉降。四个快速古陆退变表明第四纪中期至晚期在during陷盆地发生了四次典型的构造运动。

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