德吉尔地带的神话:弗拉姆海峡开放的范式变化。

Open research Europe Pub Date : 2025-03-17 eCollection Date: 2024-01-01 DOI:10.12688/openreseurope.16791.2
Jean-Baptiste P Koehl
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引用次数: 0

摘要

背景:北极新生代的裂谷作用以及由此导致的拉布拉多海和弗拉姆海峡的开放,通常与斯瓦尔巴群岛向南移动约400公里并与格陵兰岛分离有关。到目前为止,大部分的构造位移被归因于沿北向的De Geer带的横向运动,De Geer带是一条长达1000公里的古变形断层,据信从挪威西北部延伸到格陵兰岛北部。方法:利用斯瓦尔巴群岛北部和西部的地震反射资料,对构造构造进行了新的解释。结果:本研究报告了挪威北极斯瓦尔巴群岛斯匹次卑尔根岛西北和西部存在两公里厚,数百公里长,东西向至西西北向的剪切带。剪切带内的收缩构造及其走向、推断的搬运方向和发现的深度表明,它们形成于新元古代晚期(约650-550 Ma)的曼尼亚造山运动时期。这些结构在斯匹次卑尔根岛海岸线以西至少延伸80-90公里。在斯匹次卑尔根岛以西这么远的地方,连续的新元古代晚期的提马尼亚逆冲运动的存在,否定了新生代沿巴伦支海-斯瓦尔巴群岛西部沿北向的德吉尔带约400公里横向运动的存在。结论:目前的研究结果表明,De Geer带不存在,相关的断裂复合体(如Hornsund断裂复合体)不适合任何走滑运动。此外,晚新元古代的提曼逆冲构造控制了弗拉姆海峡主要的北西-东向转换断裂的形成。目前的研究结果要求对目前所有关于弗拉姆海峡开放和新生代北极构造的板块构造模型进行重大修订,并对间接观测推断的主要断裂带进行批判性审查。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The myth of the De Geer Zone: a change of paradigm for the opening of the Fram Strait.

Background: Cenozoic rifting in the Arctic and the resulting opening of the Labrador Sea and the Fram Strait are typically associated with the movement of the Svalbard Archipelago c. 400 km southwards and its separation from Greenland. Thus far, most of this tectonic displacement was ascribed to lateral movement along the N-S-striking De Geer Zone, a thousand-kilometer-long paleo-transform fault believed to extend from northwestern Norway to northern Greenland.

Methods: The study presents a new interpretation of tectonic structures on seismic reflection data north and west of Svalbard.

Results: The present study reports the presence of two km-thick, hundreds of kilometers long, E-W- to WNW-ESE-striking shear zones, northwest and west of the island of Spitsbergen, Svalbard, in the Norwegian Arctic. Contractional structures within the shear zones, their strike, the inferred transport direction, and the great depth at which they are found indicate that they formed during the Timanian Orogeny in the late Neoproterozoic (c. 650-550 Ma). These structures extend at least 80-90 km west of the coastline of Spitsbergen. The presence of continuous, late Neoproterozoic Timanian thrusts this far west of Spitsbergen invalidates the occurrence of c. 400 km lateral movements along the N-S-striking De Geer Zone along the western Barents Sea-Svalbard margin in the Cenozoic.

Conclusions: The present results suggest that the De Geer Zone does not exist and that related fault complexes (e.g., Hornsund Fault Complex) did not accommodate any strike-slip movement. In addition, the formation of major NW-SE-striking transform faults in the Fram Strait was controlled by late Neoproterozoic Timanian thrust systems. The present results call for major revisions of all current plate tectonics models for the opening of the Fram Strait and Arctic tectonics in the Cenozoic and for critical reviews of major fault zones inferred from indirect observations.

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