黑海东部侏罗纪-白垩纪岩浆弧:来自地球物理研究和二维模拟的证据

IF 2.1 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Tamara Yegorova , Valentina Gobarenko , Anna Murovskaya
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引用次数: 3

摘要

东黑海盆地的起源、构造发展和岩石圈结构受特提斯洋北支演化的支配。其演化过程中最突出的特征是在地球物理场和模型中保留了它们的印记,我们利用这些特征约束了从东Pontides到北高加索的横跨EBSB和Shatsky Ridge (SR)的地壳和上地幔的地球物理样带。在广角地震数据约束下,二维重磁模拟显示出EBSB的高密度、高速的薄海底地壳,莫霍面深度约为20 km。黑海磁场的一个引人注目的特征是SR上方的Alushta-Batumi异常(ABA),它可能是与俯冲有关的中侏罗世岩浆弧的印记,而白垩纪(东Pontides)岩浆弧则表现为黑海南部海岸线上的一系列磁异常。地震层析成像显示的高速非均质性可能是新特提斯洋北支中生代(中侏罗世和白垩纪)俯冲所致的板块图像。它显示了一个相当平坦的俯冲板块,从东庞德以南的地壳下深度向北俯冲至>中侏罗统和白垩统俯冲锋面在SR - 80 km以下紧密位于东庞泰德地区,而相关的岩浆弧分布不同,中侏罗统弧位于SR之上,白垩统东庞泰德岩浆弧则沿南部海岸线分布。后者可能是由于白垩纪东段东段与东庞德-阿尔汉格尔斯基脊和SR -北高加索域分隔开的东段东段东段所致。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Jurassic-Cretaceous magmatic arcs in the Eastern Black Sea: Evidence from geophysical studies and 2D modeling

The origin, tectonic development, and lithosphere structure of the East Black Sea Basin (EBSB) are governed by the evolution of the northern branch of the Tethys ocean. The most spectacular features of its evolution could retain their imprints in geophysical fields and models, which we used to constrain a geophysical transect for the crust and upper mantle crossing the EBSB and the Shatsky Ridge (SR) from the Eastern Pontides to the Northern Caucasus. 2D gravity and magnetic modeling, constrained by wide-angle seismic data, revealed thin high-density and high-velocity sub-oceanic crust of the EBSB with the Moho shallowing up ~20 km depth. A spectacular feature of the Black Sea magnetic field is the Alushta-Batumi anomaly (ABA) above the SR that could be an imprint of subduction-related Middle Jurassic magmatic arc, whereas the Cretaceous (in Eastern Pontides) magmatic arc manifests itself by a chain of magnetic anomalies on the southern shoreline of the Black Sea. The high-velocity heterogeneity, revealed by seismic tomography, could be an image of a slab due to Mesozoic (Middle Jurassic and Cretaceous) subduction of the northern branch of Neotethys ocean. It shows rather a flat subduction slab that plunges northwards from subcrustal depths south of Eastern Pontide to the depth of > 70–80 km below the SR. Middle Jurassic and Cretaceous subduction fronts are located closely in the region of Eastern Pontides, whereas the related magmatic arcs are spaced differently – over the SR for the Middle Jurassic arc and along the southern coastline for Cretaceous Eastern Pontide magmatic arc correspondingly. The latter could be caused by the opening of the EBSB in the Cretaceous that separated the eastern segment of the BS onto the Eastern Pontides – Arkhangelsky Ridge and the SR – Northern Caucasus domains.

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来源期刊
Journal of Geodynamics
Journal of Geodynamics 地学-地球化学与地球物理
CiteScore
4.60
自引率
0.00%
发文量
21
审稿时长
6-12 weeks
期刊介绍: The Journal of Geodynamics is an international and interdisciplinary forum for the publication of results and discussions of solid earth research in geodetic, geophysical, geological and geochemical geodynamics, with special emphasis on the large scale processes involved.
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