Despite the Mediterranean sector of the Variscan Belt being fragmented and reworked during Alpine orogenesis, evidence for the activity of a right‐lateral strike‐slip shear zone has been reported in Paleozoic fragments of the belt such as the Sardinian Variscan Basement, the Maures Massif of southern France, and in the Western Alps. To improve this correlation with new structural data, we performed a structural and microstructural analysis incorporating study of the kinematics of flow and petrochronology of a high‐strain zone in the Aiguilles Rouges Massif (External Crystalline Massifs, Western Alps). The results higlight a dextral pure‐shear dominated transpression initiated under amphibolite‐facies metamorphic conditions (~630°C, 0.4 GPa) during Variscan time. The structural evolution of the high‐strain zone is similar to the Ferriere‐Mollières shear zone in the Argentera Massif; both are transpressive shear zones active at the same time (~320 Ma) under similar metamorphic conditions. These two high‐strain zones represent well‐preserved segments of a system of ductile shear zones in the External Crystalline Massifs. The data presented in this study provide improved constraints on the extent, kinematics, and timing of the East Variscan Shear Zone in the Variscan basement of the Western Alps, with implications for refining the correlation between structures in fragments of the southern Variscan Belt. The data also better constrain a segment of a major pre‐Alpine shear zone which may have played an important role during post‐Variscan tectonics as an inherited discontinuity.

中文翻译：

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南欧瓦里斯卡纳带的高压变形：来自艾格耶鲁日断层块的新见解（西阿尔卑斯山）

尽管在高山造山过程中瓦里斯坎带的地中海部分被破碎和改造，但据报道，在该带的古生代碎片如撒丁岛瓦里斯坎地下室，莫里斯断层中有右旋走滑剪切带活动的证据。法国南部和西阿尔卑斯山。为了利用新的结构数据改善这种相关性，我们进行了结构和微结构分析，并结合了Aiguilles Rouges地块（外部晶体地块，西阿尔卑斯山）的高应变带流动和岩石年代学的研究。结果表明，在瓦里斯坎时期，在闪石相变质条件下（〜630°C，0.4 GPa）开始的右旋纯剪切为主的转化。高应变带的结构演化与阿根廷断层块的Ferriere-Mollières剪切带相似。两者都是在相似的变质条件下同时（〜320 Ma）活动的超压剪切带。这两个高应变区代表了外部晶体地块中韧性剪切带系统的保存完好的部分。这项研究中提供的数据对西阿尔卑斯山Variscan基底中的东Variscan剪切带的范围，运动学和时间提供了改善的约束，对完善南部Variscan带碎片之间的结构相关性具有影响。数据还更好地限制了主要的阿尔卑斯前剪切带的一部分，该部分可能在后瓦里斯坎构造期间作为遗传的不连续性发挥了重要作用。