...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >States of stress and slip partitioning in a continental scale strike-slip duplex: Tectonic and magmatic implications by means of finite element modeling
【24h】

States of stress and slip partitioning in a continental scale strike-slip duplex: Tectonic and magmatic implications by means of finite element modeling

机译：大陆稳定滑动双工中的应力和滑移分配的状态：通过有限元建模的构造和岩石效应

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

Orogenic belts at oblique convergent subduction margins accommodate deformation in several trench parallel domains, one of which is the magmatic arc, commonly regarded as taking up the margin-parallel, strike-slip component. However, the stress state and kinematics of volcanic arcs is more complex than usually recognized, involving first- and second-order faults with distinctive slip senses and mutual interaction. These are usually organized into regional scale strike-slip duplexes, associated with both long-term and short-term heterogeneous deformation and magmatic activity. This is the case of the 1100 km-long Liquine-Ofqui Fault System in the Southern Andes, made up of two overlapping margin parallel master faults joined by several NE-striking second-order faults. We present a finite element model addressing the nature and spatial distribution of stress across and along the volcanic arc in the Southern Andes to understand slip partitioning and the connection between tectonics and magmatism, particularly during the interseismic phase of the subduction earthquake cycle. We correlate the dynamics of the strike-slip duplex with geological, seismic and magma transport evidence documented by previous work, showing consistency between the model and the inferred fault system behavior. Our results show that maximum principal stress orientations are heterogeneously distributed within the continental margin, ranging from 15 to 25 counter-clockwise (with respect to the convergence vector) in the master faults and 10-19 clockwise in the forearc and backarc domains. We calculate the stress tensor ellipticity, indicating simple shearing in the eastern master fault and transpressional stress in the western master fault. Subsidiary faults undergo transtensional-to-extensional stress states. The eastern master fault displays slip rates of 5 to 10 mm/yr, whereas the western and subsidiary faults show slips rates of 1 to 5 mm/yr. Our results endorse that favorably oriented subsidiary faults serve as magma pathways, particularly where they are close to the intersection with a master fault. Also, the slip of a fault segment is enhanced when an adjacent fault kinematics is superimposed on the regional tectonic loading. Hence, finite element models help to understand coupled tectonics and volcanic processes, demonstrating that geological and geophysical observations can be accounted for by a small number of key first order boundary conditions. (C) 2017 Elsevier B.V. All rights reserved.
机译：在斜收敛俯冲边距造山带容纳在几个沟槽平行域变形，其中一个是岩浆弧，通常被认为是卷取缘平行，走滑分量。但是，火山弧的应力状态和运动学是更复杂的比平常认识到的，涉及具有鲜明的滑移感官和相互作用第一级和第二级的故障。这些通常被组织成区域规模走滑双链，既有长期的和短期的异构变形和岩浆活动有关。这是1100公里长Liquine-Ofqui故障系统南安第斯山脉，由几个NE-引人注目二阶断层连接的两个重叠的平行余量主故障的组成的情况下。我们提出了一个有限元模型寻址的性质和跨越并沿南安第斯山脉火山弧理解滑移分区和特别是在俯冲地震周期的相位震间构造和岩浆之间的连接，应力的空间分布。我们与以前的工作记录，显示模式和推断故障的系统行为之间的一致性地质，地震和岩浆运输相关的证据走滑双重的动力。我们的研究结果表明，最大主应力方向不均匀地大陆边缘内分布，范围从15到在主故障25逆时针（相对于会聚向量）和10-19中的顺时针方向的弧前和后弧域。我们计算应力张量椭圆，这表明在东部主断层简单剪切和扭应力西部主故障。子公司故障进行转换伸展到拉伸应力状态。东部主故障显示滑动的5率到10毫米/年，而西方和附属故障显示1至5毫米/年的滑动率。我们的研究结果赞同有利取向附属故障作为岩浆的途径，特别是当它们接近与主故障的交集。此外，当相邻的故障运动学叠加在区域构造加载故障段的滑动性提高。因此，有限元模型有助于理解耦合构造和火山过程，表明地质和地球物理观测可以通过少量的键一阶的边界条件被考虑。 （c）2017年Elsevier B.V.保留所有权利。

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