The Structure of the Gakkel Ridge: Geological and Geophysical Data

IF 1 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Geotectonics Pub Date : 2024-03-10 DOI:10.1134/s0016852123070105

A. L. Piskarev, V. D. Kaminsky, A. A. Kireev, V. A. Poselov, V. A. Savin, O. E. Smirnov, D. V. Bezumov, E. A. Dergileva, D. V. Elkina, G. I. Ovanesian, E. S. Ovsiannikova

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Abstract

In 2011‒2020 a significant number of seismic lines were carried out in the Eurasian Basin of the Arctic Ocean, which made it possible to study the structure of the junction zones of the Gakkel Ridge with the Nansen and Amundsen basins on a number of profiles. During 2019‒2020 15 sections of the Gakkel Ridge and its rift valley were studied using a sub-bottom profiler and seismo-acoustic profiling. New data on the relief of the basement, as well as the use of databases of bathymetry, gravity, and magnetic anomalies updated at VNIIOkeangeologia, made it possible to calculate the magnetization of the rocks of the Gakkel Ridge along a number of profiles crossing the ridge and to perform model calculations of the structure of the Earth’s crust using a complex of geological and geophysical data in the area of the southeastern termination of the ridge. The Gakkel Ridge is a structure that was isolated in the Early Oligocene (34 Ma)–Early Miocene (23 Ma) in the process of radical restructuring of the spreading kinematics in the existing ocean basins in the regions of the North Atlantic and the Arctic. The values of the calculated magnetization of the magnetic layer of the Earth’s crust show that this layer is partly composed of oceanic basalts, but mainly of deep-originated rocks, gabbro, and peridotites that were brought to the surface during detachment accompanying spreading. The Laptev Sea continuation of the rift valley of the Gakkel Ridge to the south of the caldera passes above many kilometers of sediments, at the base of which sedimentary rocks of Cretaceous and Late Jurassic age occur.

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加克尔海脊的结构：地质和地球物理数据

摘要 2011-2020年，在北冰洋欧亚盆地进行了大量地震测线，从而能够在一些剖面上研究加克尔海脊与南森盆地和阿蒙森盆地交界区的结构。2019-2020 年期间，使用海底剖面仪和地震声学剖面仪对加克尔海脊及其裂谷的 15 个剖面进行了研究。关于基底地形的新数据，以及利用 VNIIOkeangeologia 更新的水深测量、重力和磁异常数据库，使我们能够沿穿越海脊的若干剖面计算加克尔海脊岩石的磁化率，并利用海脊东南端区域的地质和地球物理数据进行地壳结构模型计算。加克尔海脊是早渐新世（34 Ma）-早中新世（23 Ma）在北大西洋和北极地区现有海洋盆地扩张运动学彻底重组过程中分离出来的一个结构。地壳磁层的磁化率计算值表明，该磁层部分由大洋玄武岩组成，但主要由深成岩、辉长岩和橄榄岩组成，这些岩石在伴随扩张的剥离过程中被带到地表。火山口南面的加克尔海脊裂谷的拉普捷夫海延伸段穿过数公里长的沉积层，在其底部有白垩纪和晚侏罗纪的沉积岩。

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来源期刊

Geotectonics 地学-地球化学与地球物理

CiteScore

1.90

自引率

9.10%

发文量

审稿时长

3 months

期刊介绍： Geotectonics publishes articles on general and regional tectonics, structural geology, geodynamics, and experimental tectonics and considers the relation of tectonics to the deep structure of the earth, magmatism, metamorphism, and mineral resources.