We describe a singular structure in Upper Cretaceous rocks of the Eaux‐Chaudes massif of the western Pyrenees, consisting of a kilometre‐scale fold nappe with a sheared overturned limb. High ductile strain attests a deformation style rarely reported for the alpine Pyrenees, and peak temperature in Upper Cretaceous carbonates is estimated by Raman spectroscopy of carbonaceous material palaeothermometry in the lower greenschist facies (>300°C). The normal fold limb retains the original sedimentary textures, while the overturned limb shows calcite crystal‐plastic deformation and dynamic recrystallization, with crystallographic preferred orientation. The observed ductility and metamorphic temperature bear similarities with the lower Helvetic nappes of the Alps, suggesting deep burial and/or possibly high geothermal gradient in this part of the Pyrenees.

中文翻译：

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白垩纪上层欧亚－肖德地块的斜卧：比利牛斯山上的Helvetic型推覆带？

我们在比利牛斯山西部的Eaux-Chaudes地块的上白垩统岩石中描述了一种奇异结构，该结构由一千米规模的褶皱推覆带和一个剪切的倾覆的肢体组成。高延性应变证明了高山比利牛斯山脉很少报道的变形形式，并且通过下格林西斯相（> 300°C）中碳质物质古温度计的拉曼光谱法估计了上白垩统碳酸盐岩的峰值温度。正常的褶皱肢体保留了原始的沉积质地，而翻转的肢体显示了方解石晶体塑性变形和动态再结晶，并具有晶体学上的优选取向。观测到的延展性和变质温度与阿尔卑斯山较低的Helvetic尿布有相似之处，