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首页> 外文期刊>Journal of structural geology >Modeling two sequential coaxial phases of shortening in a foreland thrust belt
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Modeling two sequential coaxial phases of shortening in a foreland thrust belt

机译：在前陆冲断带中模拟两个连续的缩短的同轴相

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Analog sandbox models are used to simulate two sequential coaxial phases of shortening in a foreland thrust belt. A sufficient hiatus is considered so that erosion and sedimentation after the first phase create an angular unconformity that is subsequently deformed. The effect of variation in thickness of post-erosional sediment package and presence of a weak layer at the unconformity level are analyzed. During the second phase, some first phase thrusts are reactivated and new thrusts are also initiated. Thrust reactivation results in a structure spacing that is smaller than the expected spacing for a thicker sediment package. Reactivation of pre-existing structures prevents the weak layer from acting as an intermediate decollement. An increase in thickness ratio tends to weaken reactivation of pre-existing thrusts. Model results also show that total displacement along individual reactivated thrusts generally increases downwards across the unconformity, which could be used to distinguish thrust reactivation in the field. Two regional examples from the northern Eastern Cordillera in Colombia and from the Variscan frontal zone in Western Europe, respectively, where multiphase coaxial shortening occurred, are compared with model results. Both natural cases show features, such as partially eroded first-generation folds and truncated first-generation thrusts that are indicators for two sequential phases of deformation as observed in the models.
机译：模拟沙箱模型用于模拟前陆逆冲带中两个连续的同轴缩短阶段。考虑到足够的裂隙，使得在第一阶段之后的侵蚀和沉积产生角度不整合，随后其变形。分析了侵蚀后沉积物包裹的厚度变化和不整合面存在薄弱层的影响。在第二阶段，一些第一阶段的推力被重新激活，新的推力也被启动。推力再活化导致结构间距小于较厚沉积物包裹的预期间距。重新激活先前存在的结构可防止薄弱层充当中间折弯。厚度比的增加趋向于削弱先前存在的推力的再激活。模型结果还表明，沿着各个重新激活的推力的总位移通常在不整合面上向下增加，这可用于区分现场的重新激活推力。将分别发生在哥伦比亚北部东部山脉和西欧瓦里斯安额叶带的两个区域实例与模型结果进行了比较，在该实例中发生了多相同轴缩短。两种自然情况都显示出特征，例如部分侵蚀的第一代褶皱和截断的第一代推力，这是模型中观察到的两个连续变形阶段的指标。

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