Abstract The thin-skinned Hronic nappe system represents the structurally highest tectonic unit in the Late Cretaceous thrust-stack of the Central Western Carpathians. It mostly comprises a Permian volcano-sedimentary sequence and Triassic carbonate sediments which crop out in different parts of the Central Western Carpathians. We carried out a systematic paleomagnetic study on 24 Permian and 20 Triassic localities geographically distributed over 300 km in W-E direction. Several samples from each locality were drilled and oriented in-situ and specimens cut from them subjected to standard paleomagnetic and magnetic mineralogy experiments. The results were evaluated using principal component analysis, statistical evaluation of the characteristic remanences, and applying inclination-only and tilt tests. We documented the pre-tilting age of remanences for the majority of both the Permian and Triassic age groups. However, the latter was interpreted as remagnetized during the Cretaceous Normal Super-Chron in the course of nappe stacking between 90−80 Ma. The Permian group is exhibiting about 70°, the Triassic about 34° clockwise vertical axis rotations with respect to the present north. There is no indication in our data set for oroclinal bending of the Hronic Unit. We interpret the difference in clockwise rotations (about 36°) between Permian and 90−80 Ma as a clockwise block rotation taking place during major extensional and/or compressive events between stable Europe and Africa. Taking into consideration the well-documented counterclockwise rotation observed for the overstep sequences in the Central Western Carpathians and in the Pieniny Klippen Belt, the remagnetization of the Triassic sediments was closely followed by about 94° clockwise rotation. Research in progress will serve to decide if this large clockwise rotation involved the whole Central Carpathian nappe stack or part of this was due to the thin-skinned nappe emplacement of the Hronic Unit.

中文翻译：

---

中西喀尔巴阡山脉 Hronic 推覆系统大规模位移的新古地磁约束

摘要 薄皮 Hronic 推覆系统是中西喀尔巴阡山脉晚白垩世逆冲叠层中构造最高的构造单元。它主要包括二叠纪火山沉积序列和三叠纪碳酸盐沉积物，这些沉积物出现在中西喀尔巴阡山脉的不同地区。我们对 WE 方向上地理分布超过 300 公里的 24 个二叠纪和 20 个三叠纪地点进行了系统的古地磁研究。来自每个地方的几个样品被钻孔和原位定向，从它们上切割出的样品进行标准的古地磁和磁性矿物学实验。使用主成分分析、特征剩磁的统计评估以及应用仅倾斜和倾斜测试来评估结果。我们记录了大多数二叠纪和三叠纪年龄组的剩磁的倾斜前年龄。然而，后者被解释为在 90-80 Ma 之间的推覆堆积过程中白垩纪正常超时间期间被再磁化。二叠纪群表现出约 70°，三叠纪约 34° 顺时针垂直轴旋转相对于现在的北。我们的数据集中没有关于 Hronic 单元的口斜弯曲的迹象。我们将二叠纪和 90-80 Ma 之间顺时针旋转的差异（约 36°）解释为在稳定的欧洲和非洲之间的主要拉伸和/或压缩事件期间发生的顺时针块旋转。考虑到在中西部喀尔巴阡山脉和 Pieniny Klippen 带中观察到的逆时针旋转，三叠纪沉积物的再磁化紧随其后是大约 94° 的顺时针旋转。正在进行的研究将有助于确定这种大的顺时针旋转是否涉及整个中央喀尔巴阡山脉的推覆层，或者其中的一部分是由于 Hronic 单元的薄皮推覆层放置所致。