澳大利亚国立大学Anna Makushkina小组在最新论文中，报道了北大西洋的开放和斯堪的纳维亚山脉的崛起。该研究于2024年10月15日发表于《地质学》杂志。

据悉，大规模的地形通常与构造板块边界有关，但斯堪的纳维亚山脉（Scandes）远离任何活跃的构造环境，其起源尚不清楚。

研究表明，Fennoscandia前寒武纪的岩石圈结构控制了北大西洋地区新生代海洋的开放和山脉隆升。新地震接收器函数分析揭示了一个由元古带地壳堆积形成的厚大陆地块。

研究人员认为，该地块在大陆裂解期间形成了一个由两个转换断层系统所界定的广阔大陆架。这种几何形状导致在叠合地壳结构两侧的大陆边缘形成岩石圈台阶，与南北Scandes的最高点相吻合。结果显示，这些台阶上的边缘驱动对流引发了山脉的隆升。本研究提出了被动边缘背后高海拔形成的一般模型。

附：英文原文

Title: Opening of the North Atlantic Ocean and the rise of Scandinavian mountains

Author: Anna Makushkina, Benoit Tauzin, Meghan S. Miller, Hrvoje Tkali, Hans Thybo

Issue&Volume: 2024-10-15

Abstract: Large-scale topography is usually associated with tectonic plate boundaries, but the Scandinavian mountains (Scandes) are located far from any active tectonic setting, and their origin is unknown. We demonstrate that the Precambrian lithospheric structure of Fennoscandia controlled both the Cenozoic ocean opening and mountain rise in the North Atlantic region. Our new seismic receiver function analysis reveals a block of thick continental crust formed by Proterozoic crustal stacking. We propose that this block created a wide continental shelf bounded by two transform fault systems during continental breakup. This geometry resulted in the formation of lithospheric steps at the continental margin on both sides of the stacked crustal structure, coinciding with the highest Southern and Northern Scandes. We propose that edge-driven convection at these steps caused the mountain rise. This study presents a general model for the formation of high elevation behind passive margins.

DOI: 10.1130/G52735.1

Source: https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G52735.1/649258/Opening-of-the-North-Atlantic-Ocean-and-the-riseredirectedFrom=fulltext