Within the Variscan Orogen, Early Devonian and Late Devonian high‐P belts separated by mid‐Devonian ophiolites can be interpreted as having formed in a single subduction zone. Early Devonian convergence nucleated a Laurussia‐dipping subduction zone from an inherited lithospheric neck (peri‐Gondwanan Cambrian back‐arc). Slab‐retreat induced upper plate extension, mantle incursion and lower plate thermal softening, favouring slab‐detachment within the lower plate and diapiric exhumation of deep‐seated rocks through the overlying mantle up to relaminate the upper plate. Upper plate extension produced mid‐Devonian suprasubduction ocean floor spreading (Devonian ophiolites), while further convergence resulted in plate coupling and intraoceanic ophiolite imbrication. Accretion of the remaining Cambrian ocean heralded Late Devonian subduction of inner sections of Gondwana across the same subduction zone and the underthrusting of mainland Gondwana (culmination of NW Iberian allochthonous pile). Oblique convergence favoured lateral plate sliding, and explained the different lateral positions along Gondwana of terranes separated by Palaeozoic ophiolites.

中文翻译：

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用于生成泥盆纪蛇绿岩和 Variscan 造山带 (NW Iberia) 的高 P 变质带的单一俯冲带

在 Variscan 造山带内，被中泥盆世蛇绿岩隔开的早泥盆世和晚泥盆世高压带可以解释为形成于单个俯冲带。早泥盆世辐合从继承的岩石圈颈（冈瓦南寒武纪后弧）形成了一个劳鲁士倾角俯冲带。板片后退引起上板块伸展、地幔侵入和下板块热软化，有利于下板块内的板块脱离和深部岩石通过上覆地幔进行底辟折返以重新叠合上板块。上板块伸展产生了中泥盆纪超俯冲洋底扩张（泥盆纪蛇绿岩），而进一步收敛导致板块耦合和洋内蛇绿岩叠瓦。剩余的寒武纪海洋的增生预示着冈瓦纳大陆内部部分的晚泥盆世俯冲穿过同一俯冲带和冈瓦纳大陆的下冲（伊比利亚西北部异地桩的顶点）。斜辐合有利于侧板滑动，解释了古生代蛇绿岩分隔的地体沿冈瓦纳的不同横向位置。