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首页> 外文期刊>Journal of Asian earth sciences >Numerical modeling of mullions in the Taili high deformation zone, North China: Implications for the rheology of granitic rocks
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Numerical modeling of mullions in the Taili high deformation zone, North China: Implications for the rheology of granitic rocks

机译：华北泰里高变形带竖框的数值模拟：对花岗岩流变学的启示

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This paper presents a combined field measurement and finite element modeling analysis of the mullions occurring on the contact of two granitic rocks with different grain size in the Taili High-Strain Deformation Zone (THDZ), West Liaoning of North China. All of the field data are located in the plot zone of the modeling results. Numerical modeling results indicate that: (1) The inter-angle between the tangent lines cross the cusp point and the ratio R of amplitude and width of mullions are the most effective parameters to describe the geometric shape and evolution of mullions, as well as useful indicators of the rheology of rocks. (2) The competence contrast controls the growth rate of mullions under shortening. It determines the possible ratio R of final mullions. Moreover, decreasing of the cusp angle in high competence contrast materials is faster than that in low competence contrast model. (3) The initial disturbance is an essential factor for the generation of mullions. Those contacts with higher initial disturbance will develop into mullions more easily and have a high growth rate during the same shortening deformation regime. (4) The rheology and deformation behavior of the granitic rocks in the study area are primarily controlled by the grain sizes of quartz and feldspar. The effective viscosity ratio of biotite adamellite and granitic gneisses is about 0.01-0.5. The deformation mechanisms.of these granitic rocks should be dominated by a grain-size-sensitive diffusion creep. (C) 2016 Elsevier Ltd. All rights reserved.
机译：本文对辽西泰里高应变变形区（THDZ）中两种粒径不同的花岗岩岩石接触时产生的竖框进行了现场测量和有限元建模分析的组合。所有现场数据都位于建模结果的绘图区域中。数值模拟结果表明：（1）切线之间的夹角与尖点相交，竖框振幅与宽度的比值R是描述竖框几何形状和演化的最有效参数，并且非常有用。岩石流变性的指标。 （2）胜任力对比控制着竖框在缩短的情况下的增长率。它确定最终竖框的可能比率R。此外，高能力对比材料的尖角减小比低能力对比模型的快。 （3）初始干扰是产生竖m的重要因素。在相同的缩短变形过程中，那些具有较高初始扰动的接触将更容易形成竖框，并具有较高的生长速率。 （4）研究区花岗岩的流变和变形行为主要受石英和长石的粒径控制。黑云母珐琅质和花岗片麻岩的有效粘度比约为0.01-0.5。这些花岗岩的变形机制应以对粒度敏感的扩散蠕变为主导。 （C）2016 Elsevier Ltd.保留所有权利。

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