Mantle-derived serpentinites have been detected at magma-poor rifted margins and above subduction zones, where they are usually produced by fluids released from the slab to the mantle wedge. Here we show evidence of a new class of serpentinite diapirs within the external subduction system of the Calabrian Arc, derived directly from the lower plate. Mantle serpentinites rise through lithospheric faults caused by incipient rifting and the collapse of the accretionary wedge. Mantle-derived diapirism is not linked directly to subduction processes. The serpentinites, formed probably during Mesozoic Tethyan rifting, were carried below the subduction system by plate convergence; lithospheric faults driving margin segmentation act as windows through which inherited serpentinites rise to the sub-seafloor. The discovery of deep-seated seismogenic features coupled with inherited lower plate serpentinite diapirs, provides constraints on mechanisms exposing altered products of mantle peridotite at the seafloor long time after their formation.

中文翻译：

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卡拉布里亚弧俯冲带中的下部板状蛇纹岩成岩作用。

地幔衍生的蛇纹岩在岩浆贫瘠的裂陷边缘和俯冲带以上被发现，它们通常是由从平板释放到地幔楔的流体产生的。在这里，我们显示了卡拉布里亚弧外俯冲系统中一类新的蛇纹岩辉石的证据，该蛇辉石辉石直接来自下板。地幔蛇纹岩通过初始裂谷和增生楔塌陷引起的岩石圈断层而上升。地幔衍生的远日作用与俯冲过程没有直接联系。可能是在中生代特提斯裂谷期间形成的蛇纹岩通过板块汇聚被带到俯冲系统之下。推动边缘分割的岩石圈断层作为窗口，继承的蛇纹岩穿过这些窗口升至海底。