Structure of the Ocean Floor in the Junction Area of King’s Trough and the Azores–Biscay Rise (North Atlantic)

IF 0.7 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Doklady Earth Sciences Pub Date : 2024-04-10 DOI:10.1134/s1028334x24601275

S. G. Skolotnev, A. A. Peyve, K. O. Dobrolyubova, A. N. Ivanenko, I. S. Patina, V. A. Bogolyubskiy, V. N. Dobrolyubov, I. A. Veklich, S. A. Dokashenko, V. L. Lyubinetskiy, I. A. Ilyin

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Abstract

The structure of King’s Trough and its surroundings (King’s mesostructural cluster), located on the eastern flank of the Mid-Atlantic Ridge in the North Atlantic, is described in this paper. This work is based on geological and geophysical data obtained during the 55th expedition of the R/V Akademik Nikolaj Strakhov. Six provinces were identified within the southeastern part of King’s Trough, based on the results of bathymetric survey. Each province has its own morphostructural feature resulting from multistage tectonic and volcanic processes, which alternate and conjugate with each other in time. According to seismoacoustic profiling data, three main types of seismic facies have been identified: (a) pelagic complexes; (b) deposits of turbidite flows; and (c) chaotic facies of gravity origin. It is shown that the anomalous magnetic field of the study area is the superposition of linear and isometric anomalies. The first were formed during the formation of the oceanic crust in the axial zone of spreading. The second are associated with volcanic massifs formed under intraplate conditions. The obtained data confirm the assumption that the formation of King’s Trough was preceded by the formation of an elongated arched rise, which became a scene of intense intraplate volcanism that increased from southeast to northwest. This stage was followed by subsidence of the axial part of the rise with the formation of King’s Trough and the Peake and Freen Troughs.

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国王海槽与亚速尔群岛-比斯开湾海隆交界区域（北大西洋）的洋底结构

摘要本文介绍了位于北大西洋大西洋中脊东侧的国王海槽及其周边地区（国王中层结构群）的结构。这项工作基于 Akademik Nikolaj Strakhov 号考察船第 55 次考察期间获得的地质和地球物理数据。根据水深测量结果，在国王海槽东南部确定了六个区域。每个区域都有自己的形态结构特征，这些特征是多阶段构造和火山过程造成的，在时间上相互交替和共轭。根据地震声剖面数据，确定了三种主要的地震剖面类型：(a) 水层复合体；(b) 湍流沉积；(c) 重力源混沌面。研究表明，研究区域的异常磁场是线性异常和等距异常的叠加。前者是在轴向扩张带的洋壳形成过程中形成的。第二种异常与板块内部条件下形成的火山丘陵有关。所获得的数据证实了这样一种假设，即在国王海槽形成之前，形成了一个拉长的弧形隆起，成为板内火山活动剧烈的场所，火山活动从东南向西北不断增加。在这一阶段之后，隆起的轴向部分下沉，形成了国王海槽、皮克海槽和弗林海槽。

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来源期刊

Doklady Earth Sciences 地学-地球科学综合

CiteScore

1.40

自引率

22.20%

发文量

138

审稿时长

3-6 weeks

期刊介绍： Doklady Earth Sciences is a journal that publishes new research in Earth science of great significance. Initially the journal was a forum of the Russian Academy of Science and published only best contributions from Russia. Now the journal welcomes submissions from any country in the English or Russian language. Every manuscript must be recommended by Russian or foreign members of the Russian Academy of Sciences.