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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 >Models of passive margin inversion: implications for the Rhenohercynian fold-and-thrust belt, Belgium and Germany
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Models of passive margin inversion: implications for the Rhenohercynian fold-and-thrust belt, Belgium and Germany

机译：被动余量反演模型：对Rheohercynian褶皱冲断带的影响，比利时和德国

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摘要

Positive tectonic inversion is related to the transmission of compressional stresses along a decollement into the foreland of an orogenic zone. This stress and strain concentration in regions remote from the main orogenic front is commonly related to the presence of pre-existing rheological heterogeneities such as normal syn-depositional faults. During inversion, these pre-existing normal faults are reactivated as reverse faults. Tectonic inversion in the Rhenohercynian fold-and-thrust belt during the Variscan Orogeny shows that inversion is likely synchronous with the onset of collision in the hinterland. Here, we present the results of a simplified thermo-mechanical model (STM) which allows one to study strain partitioning between two orogenic zones. We show that, if the two orogenic zones have the same mechanical properties, the viscosity of the decollement, which links them, controls the initial strain partitioning. During subsequent finite shortening, erosional processes determine the partitioning of strain rate. The presence of a weak structure in the inverted zone and of a low-viscosity decollement leads to initial strain concentration in the inverted track rather than in the collision zone and a progressive decrease in strain partitioning between the two orogenic zones. The STM results are in good agreement with results of a 2D finite-element model. We conclude that, in the western part of the Rhenohercynian massif, simultaneous uplift and deformation within the Mid-German Crystalline Rise (the main collision zone) and the Ardenne Anticlinorium (the inverted zone) lead to interpreting this orogenic event as a case of vice tectonic rather than the propagation of a 'wave of folding' towards the Variscan front, as suggested by previous authors.
机译：正向构造反转与压缩应力沿断面向造山带前陆的传递有关。远离主要造山带锋线的区域中的这种应力和应变集中通常与预先存在的流变异质性（例如正常的同沉积沉积断层）的存在有关。在反演期间，这些先前存在的正常故障将重新激活为反向故障。在Variscan造山运动期间，Rheohercynian褶皱-冲断带的构造反转表明，反转与内陆碰撞的发生很可能是同步的。在这里，我们介绍了简化的热机械模型（STM）的结果，该模型允许人们研究两个造山带之间的应变分配。我们表明，如果两个造山带具有相同的机械性能，则将它们链接的脱折的粘度将控制初始应变分配。在随后的有限缩短过程中，侵蚀过程决定了应变率的分配。倒置区中弱结构的存在和低粘度脱弯导致倒置轨迹中而不是碰撞区中的初始应变集中，并使两个造山带之间的应变分配逐渐减小。 STM结果与2D有限元模型的结果非常吻合。我们得出的结论是，在Rhenohercynian断层的西部，中德结晶上升（主要碰撞区）和Ardenne Anticlinorium（倒置区）内的同时隆升和变形导致将这种造山事件解释为副事件。构造，而不是像以前的作者所建议的那样，向瓦里斯坎锋向传播“折叠波”。

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