Late and post-collisional tectonic evolution of the Adria-Europe suture in the Vardar Zone

IF 2.1 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Emő Márton , Marinko Toljić , Vesna Cvetkov
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引用次数: 2

Abstract

The Vardar Zone is a product of the Triassic-Jurassic opening of the Neotethys, Jurassic obduction, Late Cretaceous/Paleogene consumption of the oceanic crust and continental collision. During the last process, the Eastern Vardar Zone was thrust over the Central and eventually both onto the Western Vardar Zone. The present paleomagnetic and structural study provided new results from the first two zones in the Belgrade area. The younger set of data, together with published ones from the third zone, provide firm evidence for about 30° clockwise vertical axial rotation of the Vardar Zone between 23 and 18 Ma, connected to extension driven by the roll-back of the Carpathians lithosphere.

Earlier, the Vardar Zone was affected by intensive compression generating a nappe pile, comprising the Eastern, Central and Western Vardar Zones. This assembly was eventually thrusted over CCW rotating Adriatic elements in the Paleogene. The rotation triggered a system of right lateral strike slip faults between different tectonic slices in the Vardar Zone. This tectonic model offers a plausible explanation for the paleomagnetic directions of post-folding age of the Upper Cretaceous flysch of the Central Vardar Zone. Nevertheless, the possibility of remagnetization of the magnetite bearing flysch during Late Neogene uplift can not be excluded.

瓦尔达尔带亚得里亚-欧洲缝合线的碰撞晚期和碰撞后构造演化
瓦尔达尔带是三叠纪-侏罗系新特提斯期张开、侏罗纪逆冲、晚白垩世/古近纪洋壳消耗和大陆碰撞的产物。在最后一个过程中,东部瓦尔达尔区被推到中部,最终都被推到了西部瓦尔达尔区。目前的古地磁和构造研究提供了贝尔格莱德地区前两个带的新结果。较年轻的一组数据,连同来自第三带的已发表的数据,提供了瓦尔达尔带在23至18 Ma之间顺时针垂直轴向旋转约30°的确凿证据,这与喀尔巴阡岩石圈回滚驱动的延伸有关。早先,瓦尔达尔带受到强烈的挤压作用,形成推覆体,包括东部、中部和西部瓦尔达尔带。该组合最终在古近纪被推覆在亚得里亚海的CCW旋转元素上。这一旋转引发了瓦尔达尔地区不同构造片之间的右侧走滑断裂体系。这一构造模式为瓦尔达尔中部上白垩统复理石褶皱后时代的古地磁方向提供了合理的解释。但是,不能排除晚新近纪隆升过程中含磁铁矿的复理石被再磁化的可能性。
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来源期刊
Journal of Geodynamics
Journal of Geodynamics 地学-地球化学与地球物理
CiteScore
4.60
自引率
0.00%
发文量
21
审稿时长
6-12 weeks
期刊介绍: The Journal of Geodynamics is an international and interdisciplinary forum for the publication of results and discussions of solid earth research in geodetic, geophysical, geological and geochemical geodynamics, with special emphasis on the large scale processes involved.
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