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Investigating distant effects of the Moesian promontory: brittle tectonics along the western boundary of the Getic unit (East Serbia)
Swiss Journal of Geosciences ( IF 1.8 ) Pub Date : 2018-10-25 , DOI: 10.1007/s00015-018-0324-5
Ana Mladenović , Milorad D. Antić , Branislav Trivić , Vladica Cvetković

In this study, we report evidence for brittle deformation in a part of the Carpatho–Balkan orogen, which is explained in terms of effects of the rigid Moesian promontory of the European plate on fault kinematics in East Serbia. We focus on the westernmost part of the Getic Unit of the East Serbian Carpatho–Balkanides, i.e. the Gornjak–Ravanica Unit, located between two main thrusts that were repeatedly activated from Early Cretaceous to recent times. We combine a new data set on fault kinematics and tectonic paleostress tensors, with literature data about neotectonic and recent fault activity, in order to reconstruct brittle tectonic events that were active in this area since Oligocene times. Two brittle tectonic phases were distinguished. The older phase was most probably active from the Oligocene to the end of the middle Miocene, and was characterized by the activation of faults that accommodated a complex sequence of clockwise rotations of the Dacia mega-unit around the rigid Moesian promontory. The younger deformational phase most likely started in the late Miocene and is probably still active in recent time. It is characterized by strike-slip tectonics, resulting from the far-field stress generated by the collision of the Adriatic microplate, the Moesian promontory and the tectonic units in between. This stress field is shown to be highly heterogeneous even in the relatively small research area; local areas of transtension and transpression have also been very important in controlling the fault kinematics in the western part of the Getic Unit.

中文翻译:

研究Moesian海角的远距离影响:沿Getic单元(东塞尔维亚)西部边界的脆性构造学

在这项研究中,我们报告了喀尔巴阡-巴尔干造山带一部分的脆性变形,这是根据欧洲板块的刚性莫伊斯海角对东塞尔维亚断层运动学的影响来解释的。我们关注的是东塞尔维亚喀尔巴阡-巴尔干尼德斯Getic部队的最西端,即Gornjak-Ravanica部队,位于两次自白垩纪到近代的多次重推之间。我们结合断层运动学和构造古应力张量的新数据集,以及有关新构造和近期断层活动的文献数据,以重建自渐新世以来在该地区活跃的脆性构造事件。区分了两个脆性构造相。从渐新世到中中新世末期,较老的阶段很可能是活跃的,并以断层的活化为特征,这些断层适应了达西亚巨型单位围绕刚性莫伊斯海角的顺时针旋转的复杂序列。较年轻的变形阶段很可能始于中新世晚期,并且可能仍在活跃。它的特征是走滑构造,它是由亚得里亚海微板块,莫斯海角和两者之间的构造单元碰撞产生的远场应力所致。即使在相对较小的研究领域,该应力场也显示出高度的异质性。在控制盖蒂奇单元西部的断层运动学方面,局部高压和高压也很重要。
更新日期:2018-10-25
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