4.5 Article

Oceanic Core Complex or not? When bathymetric structures challenge seafloor spreading models

期刊

TECTONOPHYSICS
卷 849, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.tecto.2023.229734

关键词

Magnetics; Tectonics; Oceanic Core Complexes; Seafloor spreading

向作者/读者索取更多资源

We used regional magnetic and local multibeam bathymetric data to investigate a prominent high in the Norwegian-Greenland Sea. The magnetization distribution and magnetic gradients suggest a basaltic environment, ruling out the possibility of an Oceanic Core Complex. Instead, we propose that this high is a basaltic hill and the depth asymmetry is likely caused by seafloor subsidence triggered by sediment accumulation from the Bear Island Fan.
We use regional magnetic and local multibeam bathymetric data to investigate the geological nature of a prominent high located off-axis near the junction between the Mohns and the Knipovich ridges, in the Norwegian-Greenland Sea. Given the location of this hill, near the bend marking the junction between these two ultraslow spreading centers and the bathymetric asymmetry on both sides of the ridge, an Oceanic Core Complex, corresponding to the outcropping part of an underlying detachment, was proposed as a possible interpretation. Nevertheless, the magnetization distribution over this hill is compatible with a basaltic environment and mag-netic gradients are also identical to those existing in basaltic contexts, pointing towards a similar geology. Finally, a combined plate and magnetic reconstruction reveals that this hill has a conjugate structure and that regional magnetic anomalies are symmetric. These observations rule out the Oceanic Core Complex hypothesis, as detachment surfaces are often associated with a marked spreading asymmetry. We therefore propose that this protruding bathymetric feature should rather be seen as a basaltic hill and the depth asymmetry likely results from seafloor subsidence triggered by the massive accumulation of sediments from the Bear Island Fan, on the eastern flank of the ridge axis.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.5
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据