首页> 外文期刊>Geodinamica Acta >Brittle tectonics of the Thingvellir and Hengill volcanic systems, Southwest Iceland: field studies and numerical modelling
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Brittle tectonics of the Thingvellir and Hengill volcanic systems, Southwest Iceland: field studies and numerical modelling

机译:冰岛西南部Thingvellir和Hengill火山系统的脆性构造:实地研究和数值模拟

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This paper focuses on field studies and numerical models of fracture development in the area of the Hengill Central Volcano and its northern fissure swarm containing the Thingvellir Graben, in Southwest Iceland. Apart from additional field data on normal faults, a new detailed map of the Holocene fractures in the Thingvellir Graben is presented and used as a basis for numerical models on normal fault development. Field observations and models yield four basic results. First, hyaloclastite mountains in the area ("soft mechanical inclusions") tend to deflect or arrest propagating tension fractures and normal faults. Second, fractures with an en echelon arrangement and an overlapping configuration develop shear stress shadows and tend to prevent the linking up into larger fault segments. Third, fractures with an en echelon arrangement and underlapping configuration develop shear stress concentrations between nearby tips resulting in development of transverse shear faults (transfer fault). Fourth, colinear normal fault segments concentrate tensile stresses at their tips and encourage tip-to-tip growth into larger segments. (c) 2008 Lavoisier SAS. All rights reserved
机译:本文的重点是在冰岛西南部的亨吉尔中央火山及其北部裂隙群(包括辛格韦德利尔·格拉本)的北部裂隙群的现场研究和裂缝发展的数值模型。除了有关正常断层的其他现场数据外,还给出了辛格韦德利尔格拉本(Thingvellir Graben)全新世裂缝的详细地图,并用作建立正常断层的数值模型的基础。现场观察和模型得出四个基本结果。首先,该地区的透明质岩山脉(“软机械包裹体”)倾向于偏转或阻止正在传播的张性裂缝和正断层。第二,梯形排列和重叠构造的裂缝会产生剪切应力阴影,并倾向于防止链接成更大的断层段。第三,具有梯形排列和重叠构造的裂缝在附近尖端之间产生剪切应力集中,从而导致横向剪切断层(转移断层)的发展。第四,共线法向断层段将拉应力集中在它们的尖端,并鼓励尖端到尖端增长成更大的片段。 (c)2008 Lavoisier SAS。版权所有

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