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首页> 外文期刊>Tectonophysics: International Journal of Geotectonics and the Geology and Physics of the Interior of the Earth >Evolution of the internal structure of fault zones in three-dimensional numerical models of normal faults
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Evolution of the internal structure of fault zones in three-dimensional numerical models of normal faults

机译：正断层三维数值模型中断层带内部结构的演化

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摘要

Fault zone internal structure is characterised by heterogeneous distributions of both continuous (drag, lens rotation) and discontinuous (joints, faults) deformation which cannot be easily modelled using continuum numerical methods. Distinct element method (DEM) models, that exhibit bulk rheologies comparable to rock, demonstrate emergent behaviours that make them ideal for modelling both the nucleation and growth of fault zones. The ability to model fault zones numerically allows extant conceptual models for fault zone evolution based on outcrop studies to be tested, and controls on fault zone structure to be analysed. Three-dimensional DEM models of faults zones in mechanically layered sequences demonstrate that internal fault zone structure is predominantly controlled by the geometry of the initial fault. Whether the initial fault is a segmented array or an irregular surface determines the complexity of structure it will develop as displacement increases. Confining pressure at the time of faulting determines the irregularity of the initial fault array and also the efficiency with which irregularities are incorporated into a fault and subsequently comminuted, leading to a relationship whereby brittle faulting at high confining pressure results in less complex internal fault zone structure than at low confining pressure. (C) 2015 Elsevier B.V. All rights reserved.
机译：断层带内部结构的特征是连续（拖曳，透镜旋转）和不连续（接缝，断层）变形的不均匀分布，使用连续数值方法不容易建模。独特的单元法（DEM）模型显示出与岩石相当的整体流变性能，并展示了新兴的行为，使其成为建模断层成核和生长的理想选择。对断层区域进行数值建模的能力允许测试基于露头研究的断层区域演化的现有概念模型，并分析断层区域结构的控制。机械分层序列中断层带的三维DEM模型表明内部断层带结构主要受初始断层的几何形状控制。初始断层是分段阵列还是不规则表面决定了随着位移增加其发展的结构的复杂性。断层时的围压决定了初始断层阵列的不规则性，也决定了将不规则性合并到断层中并随后进行粉碎的效率，从而导致了一种关系，即高围压下的脆性断层导致内部断层带结构的复杂性降低比在低围压下。 （C）2015 Elsevier B.V.保留所有权利。

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