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首页> 外文期刊>Terra Nova >Recumbent folding in the Upper Cretaceous Eaux-Chaudes massif: A Helvetic-type nappe in the Pyrenees?
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Recumbent folding in the Upper Cretaceous Eaux-Chaudes massif: A Helvetic-type nappe in the Pyrenees?

机译:上层白垩纪EAUX-CHAUDES MASSIF卧式折叠:在比利牛斯的热带型Nappe?

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摘要

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 degrees 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.
机译:我们描述了比利牛斯山脉西部Eaux Chaudes地块上白垩统岩石中的一个奇异构造,由一个千米级褶皱推覆体和一个剪切翻转的翼片组成。高韧性应变证明了阿尔卑斯山比利牛斯山脉的变形类型很少被报道,上白垩统碳酸盐岩的峰值温度是通过下绿片岩相(>300摄氏度)中碳质材料古测温的拉曼光谱估计的。正常褶皱翼保留了原始沉积结构,而翻转翼显示方解石晶体塑性变形和动态再结晶,具有晶体优先取向。观察到的延展性和变质温度与阿尔卑斯山较低的Helvetic推覆体相似,表明比利牛斯山的这一部分埋藏较深和/或可能存在较高的地热梯度。

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