...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Volcanology and Geothermal Research >Transient dike propagation and arrest near the level of neutral buoyancy
【24h】

Transient dike propagation and arrest near the level of neutral buoyancy

机译：瞬态堤防在中性浮力水平附近的传播和阻止

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

We present a finite difference/perturbation method to investigate transient dike propagation from a magma chamber 1-2 km below the level of neutral buoyancy in oceanic crust and explore the role of density gradation in dike propagation arrest. The dike is modeled as a magma-filled blade crack and the host rock is assumed to be a linear elastic medium with graded mass density. An integral equation approach is used to obtain the dike propagation velocity and stress intensity factor at the propagating dike tip. The finite difference/perturbation method is applicable generally to mafic dikes with r;V less than 50 Pa-m, where η is the magma viscosity and V the dike propagation velocity. Numerical results show that dike propagation velocity initially increases with dike length, reaches a peak value when the dike tip reaches a position well above the level of neutral buoyancy and then rapidly decreases to zero after the dike propagates further into the region above the level of neutral buoyancy, which indicates that density gradation is an effective mechanism for dike arrest. The effects of host-rock fracture toughness and magma chamber depth relative to the level of neutral buoyancy are also discussed.
机译：我们提出了一种有限差分/摄动法，以调查从洋壳中性浮力以下1-2 km的岩浆室瞬变堤防的传播，并探讨密度等级在堤防传播停滞中的作用。堤坝被建模为岩浆充填的叶片裂缝，并且假定主岩为质量密度渐变的线性弹性介质。积分方程法用于获得堤坝传播末端的堤坝传播速度和应力强度因子。有限差分/摄动法通常适用于r; V小于50 Pa-m的铁镁质堤防，其中η为岩浆粘度，V为堤防传播速度。数值结果表明，堤防传播速度最初随堤防长度的增加而增加，当堤防尖端到达远高于中性浮力水平的位置时达到峰值，然后在堤防进一步传播到中性水平面以上的区域后迅速降低至零。浮力，表明密度等级是堤防的有效机制。还讨论了母岩断裂韧性和岩浆室深度相对于中性浮力水平的影响。

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