Abstract This work uses high-quality reprocessed 2D data, tied to borehole information, to address the development of North Atlantic Jurassic seaways on the continental margin of West Iberia. The seismic data reveal the full thickness of Mesozoic syn-rift strata filling deep-offshore basins in this latter region. Tectonic subsidence resulted in the separation of the seaway into distal and proximal sectors. As a result, backstripped curves for West Iberia document important tectonic subsidence during the Late Triassic-earliest Jurassic. The Lusitanian and Peniche basins were part of the same seaway during the early stages of rifting, with important rift-shoulder exhumation occurring between the seaway and the distal margin from Late Jurassic onwards. We estimate 5 km subsidence in the deep-offshore Peniche Basin during the Late Triassic-Early Jurassic when compared to the ~1.1 km recorded in the proximal Lusitanian Basin. Critically, borehole stratigraphy shows that early Mesozoic basins in West Iberia, Newfoundland, and the North Sea show a tripartite depositional evolution of stacked continental, evaporitic, and marine strata. The similar Early Triassic-Jurassic seismic and stratigraphic records of the Lusitanian and Peniche basins suggest a co-genetic evolution with other early Mesozoic basins along the North Atlantic margin.

中文翻译：

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上三叠统至下侏罗统盐分在北大西洋古海道识别中的意义

摘要 这项工作使用与钻孔信息相关的高质量再处理 2D 数据来解决西伊比利亚大陆边缘北大西洋侏罗纪海道的开发问题。地震数据揭示了在后一地区充满深海盆地的中生代同裂谷地层的全厚度。构造沉降导致海道分为远侧和近侧部分。因此，西伊比利亚的后倾曲线记录了晚三叠世-早侏罗世期间重要的构造沉降。Lusitanian 和 Peniche 盆地在裂谷的早期阶段是同一海道的一部分，从晚侏罗世开始，在海道和远缘之间发生了重要的裂谷肩折返。与近端 Lusitanian 盆地记录的约 1.1 公里相比，我们估计晚三叠世 - 早侏罗世期间深海 Peniche 盆地的沉降为 5 公里。至关重要的是，钻孔地层显示西伊比利亚、纽芬兰和北海的早期中生代盆地显示了堆积的大陆、蒸发和海相地层的三重沉积演化。Lusitanian 和 Peniche 盆地类似的早三叠世-侏罗纪地震和地层记录表明与沿北大西洋边缘的其他早中生代盆地的共同成因演化。和海相地层。Lusitanian 和 Peniche 盆地类似的早三叠世-侏罗纪地震和地层记录表明与沿北大西洋边缘的其他早中生代盆地的共同成因演化。和海相地层。Lusitanian 和 Peniche 盆地类似的早三叠世-侏罗纪地震和地层记录表明与沿北大西洋边缘的其他早中生代盆地的共同成因演化。