Mountain-building often involves the subduction of continental margins during the convergence of tectonic plates. Rheological heterogeneities and structural inheritance in the subducting lithosphere are main factors controlling the evolution of the process and deformation partitioning in orogenic wedges. Here, we present tomographic evidence of a main along-strike change in the structure of the Apennines belt, where frontal accretion diminishes laterally, as well as plate bending, and the contribution of underplating to crustal thickening becomes evident. We hypothesize that the diverse mechanisms of mountain formation can be attributed to rheological heterogeneity in the crust and interactions with fluids liberated during the subduction process. The development of shallow decollements versus underplating is favored by differing amounts and styles of deep fluid liberation from the subducting crust.

中文翻译：

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大陆造山作用中增生机制与深层流体的相互作用


造山活动通常涉及构造板块汇聚过程中大陆边缘的俯冲。俯冲岩石圈的流变非均质性和结构继承性是控制造山楔过程演化和变形分区的主要因素。在这里，我们提供了亚平宁带结构主要沿走向变化的断层扫描证据，其中锋面增生横向减少，板块弯曲以及底侵对地壳增厚的贡献变得明显。我们假设，山脉形成的不同机制可归因于地壳的流变异质性以及与俯冲过程中释放的流体的相互作用。俯冲地壳中不同数量和类型的深层流体释放有利于浅层滑脱与底侵的发展。