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首页> 外文期刊>Geodinamica Acta >Transected folds with opposite patterns in Terena Formation (Ossa Morena Zone, Portugal): anomalous structures resulting from sedimentary basin anisotropies
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Transected folds with opposite patterns in Terena Formation (Ossa Morena Zone, Portugal): anomalous structures resulting from sedimentary basin anisotropies

机译：特雷纳组（葡萄牙奥萨莫雷纳区）中具有相反模式的横折：沉积盆地各向异性导致的异常构造

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摘要

The Terena Formation is located in the central part of the Ossa-Morena Zone(OMZ)and outcrops in the core of a latter(W) first order syncline. This Formation is a Lower Devonian flysch and shows an unusual 'Z" shape, with a central sector trending nearly N-S, and the tips trending NW-SE. This central sector is crossed by the cleavage (NW-SE) showing an apparent dextral (clockwise) transection pattern, anomalous and opposite to the regional widespread sinistral (anti-clockwise) transpression. The same sector with cartographic dextral transection, shows at outcrop scale, mesoscopic folds with a sinistral transection. During the Lower Devonian a N-S trending basin was developed as an effect of an early tectonic deformation phase. This trough was filled with turbidites and its elongated geometry determined the shape of the main syncline. We propose that the dextral transection pattern, at cartographic scale, result from the superposition of the NW-SE upright S3 cleavage on this major regional structure controlled by a sedimentary trough. The mesoscopic folds, observed on the Upper levels of the sedimentary Sequence were not influenced by the topographic anisotropy of the basin, and therefore they developed a left transection, according to the regional deformation mechanisms. The "Z" shape of the syncline could be explained as a consequence of two major tectonic shear zones Situated along the north and south boundaries of the OMZ, respectively the Tornar-Badajoz-Cordoba Shear Zone and the South Iberian Suture, lined by the Beja-Acebuches Ophiolitic Complex. Both shear zones have a sinistral transpressive character and were active during late Variscan tectonic events.
机译：Terena地层位于Ossa-Morena地带（OMZ）的中部，露头位于后者（W）一阶向斜线上。该地层为下泥盆统飞石，呈不寻常的“ Z”形，中心部分趋近NS，尖端向NW-SE倾斜。该中心部分被乳沟（NW-SE）穿过，显示出明显的右旋（逆时针横切模式，异常且与区域广泛的左旋（逆时针）逆转。与右旋横切图相同的区域显示出露头尺度，中观褶皱与左横切线。在下泥盆纪形成了一个NS趋势盆地作为早期构造变形阶段的影响，该海槽中充斥着浑浊的岩石，其细长的几何形状决定了主向斜的形状，我们认为，在制图尺度上，右手横切模式是由NW-SE直立的叠置产生的在沉积槽控制下的这一主要区域结构上发生了S3裂解，在沉积层序的高层观测到的介观褶皱没有受到影响受盆地地形各向异性的影响，因此，根据区域变形机制，他们形成了一个左横断面。向斜线的“ Z”形可以解释为是由于沿着OMZ的北边界和南边界存在两个主要的构造剪切带，分别是由Beja衬砌的Tornar-Badajoz-Cordoba剪切带和南伊比利亚缝合线-Acebuches蛇纹石复合体。这两个剪切带都具有窦性压性特征，并且在晚期瓦里斯坎构造事件中活跃。

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