Serpentinization greatly affects the physical and chemical properties of lithospheric mantle. Here we address the fate of serpentinized peridotites and their influence over an entire Wilson cycle. We document the near-surface journey of serpentinized subcontinental peridotites exhumed during rifting and continental breakup, reactivated as buoyant material during subduction, and ultimately emplaced as “ophiolite-like” fragments within orogenic belts. This life cycle is particularly well documented in former Tethys margins, where recent studies describe the ongoing incorporation of Mesozoic serpentinized subcontinental peridotites that diapirically rise from a subducting lower plate’s mantle to be emplaced into the accretionary prism in front of a continental arc. This newly recognized mode of subduction-linked serpentine diapirism from the downgoing lithospheric slab is consistent with the origin of some exhumed serpentinized subcontinental peridotites in the Apennines (Italy), these assemblages reaching their present locations during Alpine orogenesis. Transfer of serpentinized subcontinental peridotites from the downgoing to the overriding plate motivates the concept of a potentially “leaky” subduction channel. Weak serpentine bodies may in fact rise into, preferentially migrate within, and eventually leave the intraplate shear zone, leading to strong lateral heterogeneities in its composition and mechanical strength.

中文翻译：

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次大陆橄榄岩的生命周期：从俯冲的大陆边缘到俯冲过程的山脉

蛇纹石化极大地影响了岩石圈地幔的物理和化学性质。在这里，我们讨论蛇形橄榄岩的命运及其在整个威尔逊循环中的影响。我们记录了在裂谷作用和大陆分裂过程中发掘出的蛇纹化的次大陆橄榄岩的近地表旅程，在俯冲过程中被重新活化为浮性物质，并最终被定位为造山带中的“蛇绿岩样”碎片。这个生命周期在特提斯山前缘特别有据可查，最近的研究描述了中生代蛇形化的亚大陆橄榄岩的不断整合，这些亚橄榄岩从俯冲的下板地幔呈放射状上升，被安置到大陆弧前的增生棱镜中。俯冲的岩石圈平板上俯冲相关的蛇纹岩成岩作用的这种新认识的模式与亚平宁山脉（意大利）中一些发掘出的蛇纹石化的亚大陆橄榄岩的起源是一致的，这些组合在高山造山过程中到达了它们目前的位置。蛇纹石化的次大陆橄榄岩从下沉向上覆板的转移激发了潜在的“泄漏”俯冲通道的概念。弱的蛇形体实际上可能会上升，优先向内部迁移并最终离开板内剪切区，从而导致其成分和机械强度出现强烈的横向异质性。这些组合在高山造山运动中到达其当前位置。蛇纹石化的次大陆橄榄岩从下沉向上覆板的转移激发了潜在的“泄漏”俯冲通道的概念。弱的蛇形体实际上可能会上升，优先向内部迁移并最终离开板内剪切区，从而导致其成分和机械强度出现强烈的横向异质性。这些组合在高山造山运动中到达其当前位置。蛇纹石化的次大陆橄榄岩从下沉向上覆板的转移激发了潜在的“泄漏”俯冲通道的概念。弱的蛇形体实际上可能会上升，优先向内部迁移并最终离开板内剪切区，从而导致其成分和机械强度出现强烈的横向异质性。