...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of earth system science >Vorticity patterns along the Main Central Thrust Zone, Alaknanda–Dhauli Ganga Valleys (Garhwal), Uttarakhand Himalaya
【24h】

Vorticity patterns along the Main Central Thrust Zone, Alaknanda–Dhauli Ganga Valleys (Garhwal), Uttarakhand Himalaya

机译：Verty模式沿着

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

摘要

The Greater Himalayan Sequence (GHS), constituting the anatectic core of the Himalaya, is generally modelled as a mid-crustal southward extruding channel or wedge. Movements along the Main Central Thrust (MCT) in the south and the South Tibetan Detachment System (STDS) in the north and exhumation along the Himalayan front played an important role in the extrusion of the GHS from beneath the Tibetan plateau during the Miocene. To understand the kinematics of these orogen-scale shear zones, it is important to constrain the percentage of pure shear associated with them. In this paper, we present the kinematic vorticity data from the Main Central Thrust Zone (MCTZ), Alaknanda and Dhauli Ganga Valleys (Garhwal), Uttarakhand Himalaya. The mean kinematic vorticity number ( W $_{m} $), which can be used to calculate the percentage of pure shear, has been estimated by analysing the rotational behaviour of rigid grains in a ductile matrix. The analysis reveals that pure shear provides significant contribution (30–52%) to the deformation associated with southward ductile shearing along the MCT, with the highest mean kinematic vorticity number ( W $_{m} $) values close to the MCT. The results provide important quantitative constraints for the boundary conditions in the extrusion models. The Wm values from within the anatectic core have not been reported as most of the vorticity gauges fail due to increased deformation temperatures in this region. $f{Highlights}$ $ullet$ Orogen-scale mid-crustal southward extruding channel or wedge models deformation of the Great Himalayan Sequence (GHS) of the anatectic core, whose kinematics is to be understood by constraining the percentage of pure shear. $ullet$ Vorticity estimation near the Main Central Thrust Zone (MCTZ) is performed along the Alaknanda–Dhauli Ganga Valleys, Uttarakhand Himalaya along with critical analysis of published vorticity data from the other areas. $ullet$ Mean kinematic vorticity number (Wm), a quantitative estimator of pure shear percentage during non-coaxial deformation in a shear zone, varies between 0.675 and 0.875 within the MCTZ, corresponding to a pure shear percentage between 30% and 52%. $ullet$ A general trend of decreasing pure shear component towards the channel boundaries is explained by velocity profile within an extruding channel of hot and low-viscosity mid-crustal rocks and observed from the compiled vorticity data from other Himalayan traverses. $ullet$ Our results agree with the channel flow conceptual model and provide quantitative constraints on the percentage of pure shear associated with deformation within the GHS.
机译：构成喜马拉雅山脉的较大的喜马拉雅序列（GHS）通常被建模为中型地壳向南挤出通道或楔形。沿着南部的主要中央推力（MCT）沿着北部的主要中央推力（MCT）的运动在北方和喜马拉雅前面的挖掘中挖出了重要作用，在中新世期间在藏高的高原下方挤出了GHS。要了解这些造型造型剪力区的运动学，重要的是限制与它们相关的纯剪切的百分比。在本文中，我们介绍了来自主要中央推力区（MCTZ），Alaknanda和Dhauli Ganga Valleys（Garhwal）的运动涡流数据，Uttarakhand Himalaya。通过分析韧性矩阵中的刚性颗粒的旋转行为，估计了可用于计算纯剪切百分比的平均运动涡度数（W $ _ {M} $）。分析表明，纯剪切为与MCT沿着MCT的南部延展剪切相关的变形提供了显着的贡献（30-52％），最高均值的运动涡度数（W $ _ {M} $）值靠近MCT。结果为挤出模型中的边界条件提供了重要的定量约束。由于该区域中的变形温度增加，大多数涡度仪表未被报告来自阴性核心的WM值。 $ bf {亮点} $ bullet $ orgent $ orogen-scale中型中外的南方挤出通道或楔形模型的巨大喜马拉雅序列（GHS）的变形是一种富裕的核心，其运动学将通过限制纯剪切的百分比来理解。 $ bullet $ $ victicity估计在主要的中央推力区（MCTZ）附近沿着Alaknanda-Dhauli Ganga Valleys进行，uttarakhand Himalaya以及对来自其他地区的公布数据的批判性分析。 $ bullet $均值运动涡度数（wm），在剪切区中的非同轴变形期间纯剪切百分比的定量估计值在MCTZ内的0.675和0.875之间变化，对应于30％和52％之间的纯剪切百分比。 。 $ bullet $朝向通道边界减少纯剪切组分的一般趋势是通过挤出通道内的速度和低粘度中地壳岩石中的速度曲线来解释，并从其他喜马拉雅横向的编译涡流数据观察。 $ bullet $我们的结果与频道流概念模型一致，并为GHS内变形相关的纯剪切百分比提供定量约束。

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