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Geomorphology of a modern carbonate slope system and associated sedimentary processes: Example of the giant Great Abaco Canyon, Bahamas
Sedimentology ( IF 3.5 ) Pub Date : 2020-07-02 , DOI: 10.1111/sed.12777
Audrey Recouvreur 1 , Natacha Fabregas 2 , Thierry Mulder 1 , Vincent Hanquiez 1 , Kelly Fauquembergue 1 , Elsa Tournadour 3, 4 , Hervé Gillet 1 , Jean Borgomano 5, 6 , Emmanuelle Poli 7 , Jean‐Baptiste Kucharski 1 , Stanislas Wilk 1
Affiliation  

The large acoustic data set acquired during the Carambar cruises is composed of high resolution bathymetry, backscatter data and very‐high resolution seismic lines which allow for an overview of the morphology and sediment transfer processes from the shallow upper slope to the abyssal plain of a modern carbonate system: the north‐eastern slope of the Little Bahama Bank. Surficial distribution of the acoustic facies and echofacies reflects a wide variety of sedimentary processes along and across the slope. The western sector of the Little Bahama Bank is dominated by depositional processes whereas its eastern sector, which is incised in the lower slope by giant canyons, is affected by erosion and bypass processes. Datasets suggest that currents play an important role both in along‐slope sedimentary processes and in the abyssal plain. The Antilles Current appears to affect a large part of the middle and lower slopes. The absence of sizeable present‐day channel/levée complexes or lobes at the mouth of the canyon – revealed by the bathymetric map – indicates that the southward flowing Deep Western Boundary Current influences modern abyssal sediment deposition. Based on depositional processes and indicators of canyon maturity observed in facies distribution, the current study proposes that differential subsidence affects the eastern versus western part of the bank. The morphology of the Great Abaco Canyon and Little Abaco Canyon, which extend parallel to the platform, and the Little Bahama Bank slope appears to be related to the Great Abaco Fracture Zone.

中文翻译:

现代碳酸盐岩斜坡系统的地貌学及其相关沉积过程:以巴哈马群岛的大阿巴科峡谷为例

在Carambar巡洋舰期间获取的大量声波数据集由高分辨率测深法,反向散射数据和超高分辨率地震线组成,可以大致了解现代浅层斜坡至深海平原的形态和沉积物迁移过程。碳酸盐体系:小巴哈马银行的东北坡。声相和回波相的表面分布反映了沿斜坡和横跨斜坡的各种沉积过程。小巴哈马银行的西部地区受沉积过程控制,而东部地区则受侵蚀​​和绕过过程的影响,而东部地区由较大的峡谷在较低的斜坡上切开。数据集表明,洋流在沿坡沉积过程和深海平原中都起着重要作用。荷属安的列斯海流似乎影响了中坡和下坡的很大一部分。测深图显示,峡谷口目前没有大型的当今河道/大堤复合物或裂片,表明向南流动的深西部边界流影响了现代深海沉积物的沉积。根据沉积相和在相分布中观察到的峡谷成熟度指标,当前研究表明,差异沉降会影响该银行的东部和西部。平行于平台延伸的大阿巴科峡谷和小阿巴科峡谷的形态,小巴哈马河岸坡似乎与大阿巴科断裂带有关。测深图显示,峡谷口目前没有大型的当今河道/大堤复合物或裂片,表明向南流动的深西部边界流影响了现代深海沉积物的沉积。根据沉积相和在相分布中观察到的峡谷成熟度指标,当前研究表明,差异沉降会影响该银行的东部和西部。平行于平台延伸的大阿巴科峡谷和小阿巴科峡谷的形态,小巴哈马河岸坡似乎与大阿巴科断裂带有关。测深图显示,峡谷口目前没有大型的当今河道/大堤复合物或裂片,表明向南流动的深西部边界流影响了现代深海沉积物的沉积。根据沉积相和在相分布中观察到的峡谷成熟度指标,当前研究表明,差异沉降会影响该银行的东部和西部。平行于平台延伸的大阿巴科峡谷和小阿巴科峡谷的形态,小巴哈马河岸坡似乎与大阿巴科断裂带有关。根据沉积相和在相分布中观察到的峡谷成熟度指标,当前研究表明,差异沉降会影响该银行的东部和西部。平行于平台延伸的大阿巴科峡谷和小阿巴科峡谷的形态,小巴哈马河岸坡似乎与大阿巴科断裂带有关。根据沉积相和在相分布中观察到的峡谷成熟度指标,当前研究表明,差异沉降会影响该银行的东部和西部。平行于平台延伸的大阿巴科峡谷和小阿巴科峡谷的形态,小巴哈马河岸坡似乎与大阿巴科断裂带有关。
更新日期:2020-07-02
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