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Oceanographic control of the submarine landslides of the northern Galicia Area (Bay of Biscay, NE Atlantic)
Marine Geophysical Research ( IF 1.4 ) Pub Date : 2021-04-10 , DOI: 10.1007/s11001-021-09433-1
Ricardo León , Natalia Martínez-Carreño , Soledad García-Gil , Juan Antonio Rengel , Carmen Julia Giménez-Moreno , Isabel Reguera

This paper characterizes in detail for the first time the gravitational instabilities in two zones of the northern Galicia Area (Bay of Biscay, NE Atlantic): the Jean Charcot ridge (3700 to 4950 mwd) and the Castro marginal platform (1900 to 2500 mwd). Mass transport deposits (MTDs) show different seismo-stratigraphic structures depending on their physiographic location, mostly determined by the actions of bottom currents. On the Jean Charcot ridge, MTDs are mainly present in intra-basins of the inner part of the ridge, a sector unaffected by strong bottom currents. MTDs appear on the seafloor and inside the sedimentary column as stacked levels of transparent acoustic facies interbedded with an alternation of continuous reflections of high and moderate amplitude. On the southeast flank of this ridge, an area affected by moderate to high bottom currents, several headwall scars have been observed. However, MTDs are only present on the seafloor in bathymetrical entrances that are partially protected from the Atlantic and Antarctic bottom currents. We correlate this lack of MTDs with the erosional and reworking processes of Atlantic and Antarctic bottom currents along the Biscay and Charcot channels. On the Castro marginal platform, MTDs are composed of layers of up to 10 ms two-way travel time in thickness topped by patches of blanking acoustic facies and separated by continuous reflections of high amplitude. MTDs form a complex mixed system (down- and alongslope processes) that may have been generated during the Quaternary cold periods.



中文翻译:

加利西亚北部地区(北大西洋比斯开湾)海底滑坡的海洋学控制

本文首次详细描述了北部加利西亚地区(北大西洋比斯开湾)两个地区的重力失稳:Jean Charcot脊(3700至4950 mwd)和Castro边缘平台(1900至2500 mwd) 。大众运输沉积物(MTD)取决于其生理位置,显示出不同的地震地层结构,这主要取决于底流的作用。在让·夏科特(Jean Charcot)脊上,MTD主要存在于脊内部的盆地内,该区域不受强底电流的影响。MTD出现在海底和沉积柱内部,是透明声相的堆积层与高振幅和中振幅的连续反射交替插入的结果。在这个山脊的东南侧面,在受中等至较高的海底电流影响的区域中,已观察到多个端壁伤痕。但是,MTD仅存在于海底测深仪入口处,该入口部分受到大西洋和南极海底流的保护。我们将MTD的缺乏与Biscay和Charcot通道沿大西洋和南极海流的侵蚀和返工过程联系起来。在Castro边缘平台上,MTD包括厚度达10 ms的双向传播时间的层,其顶部是消隐声相的补丁,并被高振幅的连续反射所分隔。MTD形成了一个复杂的混合系统(下坡和顺坡过程),这可能是在第四纪冷期产生的。MTD仅出现在海底的等深线入口处,部分入口受到大西洋和南极海底流的保护。我们将MTD的缺乏与Biscay和Charcot通道沿大西洋和南极海流的侵蚀和返工过程联系起来。在Castro边缘平台上,MTD包括厚度达10 ms的双向传播时间的层,其顶部是消隐声相的补丁,并被高振幅的连续反射所分隔。MTD形成了一个复杂的混合系统(下坡和顺坡过程),这可能是在第四纪冷期产生的。MTD仅出现在海底的等深线入口处,部分入口受到大西洋和南极海底流的保护。我们将MTD的缺乏与Biscay和Charcot通道沿大西洋和南极海流的侵蚀和返工过程联系起来。在Castro边缘平台上,MTD包括厚度达10 ms的双向传播时间的层,其顶部是消隐声相的补丁,并被高振幅的连续反射所分隔。MTD形成了一个复杂的混合系统(下坡和顺坡过程),这可能是在第四纪冷期产生的。我们将MTD的缺乏与Biscay和Charcot通道沿大西洋和南极海流的侵蚀和返工过程联系起来。在Castro边缘平台上,MTD包括厚度达10 ms的双向传播时间的层,其顶部是消隐声相的补丁,并被高振幅的连续反射所分隔。MTD形成了一个复杂的混合系统(下坡和顺坡过程),这可能是在第四纪冷期产生的。我们将MTD的缺乏与Biscay和Charcot通道沿大西洋和南极海流的侵蚀和返工过程联系起来。在Castro边缘平台上,MTD包括厚度达10 ms的双向传播时间的层,其顶部是消隐声相的补丁,并被高振幅的连续反射所分隔。MTD形成了一个复杂的混合系统(下坡和顺坡过程),这可能是在第四纪冷期产生的。

更新日期:2021-04-11
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