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Controversial epiglyptic thrust sheets: The case of the Daroca Thrust (Iberian Chain, Spain)
Journal of Structural Geology ( IF 3.1 ) Pub Date : 2021-02-15 , DOI: 10.1016/j.jsg.2021.104298
J.L. Simón , A.M. Casas-Sainz , A. Gil-Imaz

Epiglyptic thrusts can be misinterpreted as paleolandslides since they underwent displacement on the Earth surface. The Daroca Thrust has been object of controversial interpretations owing to (i) the particular style of its frontal structure (a thin slab of Cambrian dolostones overthrusting syntectonic Miocene deposits), and (ii) its relatively young age with respect to the overall compressional building of the Iberian chain. While several authors have interpreted its frontal flat as a synsedimentary landslide, a number of key features evince that it represents an epiglyptic thrust: (i) recumbent folds in competent Cambrian dolostones; (ii) thick damage zone with foliated fault rocks; (iii) physical continuity between the frontal flat and the main thrust ramp; (iv) transport directions towards NNE and E consistently recorded in both of them. Geometric reconstruction in cross section indicates that the syntectonic deposits of the Daroca area lie below the well-dated succession of the Aragonian stratotype (Middle Miocene). Nevertheless, by extrapolating the age model resulting from the complete succession of mammal sites, it can be inferred that the slip on the Daroca Thrust still took place during Middle Aragonian time.



中文翻译:

有争议的癫痫推力片:达罗卡推力案(西班牙伊比利亚链)

癫痫冲刺可能会被误认为是古滑坡,因为它们在地球表面经历过位移。由于(i)其正面结构的特殊风格(一薄层的寒武纪白云岩推覆了中新世沉积的构造),以及(ii)相对于整体构造而言,它的年龄还相对较小,Daroca推力一直是有争议的解释的对象。伊比利亚连锁店。尽管有几位作者把它的前部平面解释为是同沉积的滑坡,但许多关键特征表明它代表了一种癫痫性的推力:(i)寒武纪白云岩中的倾斜褶皱;(ii)具叶状断层岩石的厚破坏区;(iii)正面平坦部分和主推力斜坡之间的物理连续性;(iv)两者中一致记录的往NNE和E的运输方向。横截面的几何重建表明,达罗卡地区的构造构造沉积物位于阿拉贡层型(中新世)的良好演替之下。然而,通过推断完全由哺乳动物种群继承而产生的年龄模型,可以推断出达罗卡推力的滑动仍然发生在中阿拉贡时期。

更新日期:2021-02-22
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