The Opening of the Fram Strait and its influence on sediment transport, climate and ocean circulation between the Arctic Ocean and the North Atlantic

弗拉姆海峡是北冰洋和大西洋之间唯一的深水连接，新近纪的开放和随后的加宽是一个基本的构造事件，对全球海洋环流和古气候演变以及邻近洋盆和大陆边缘的沉积过程产生了广泛的影响。将积累的沉积物档案与地震填图相结合，并结合现有钻探岩芯的地层信息，将有助于解开这一深海门户在构造时间尺度(100.000-1.00000年)上的演化。因此，沉积构造的地震地层学解释将提供关于该地区区域构造、海洋和古气候发展的有价值的信息，以及北半球冰川历史的其他信息。为了实现这一点，我们将使用来自弗拉姆海峡的AWI地震反射数据，这些数据需要部分重新处理。此外，我们将分别使用来自邻近大陆边缘和共轭大陆边缘的外部(BGR、NPD、GEUS)地震反射数据，这些数据最近已向我们开放。我们的主要目标是根据地震反射模式和内部沉积几何图形识别不同的泥沙堆积机制。有了这些信息，我们就可以重建弗拉姆海峡的构造过程和海洋环流的变化。已公布的年龄模型(其中一些显然将在我们的项目期间进行修订)和来自DSDP/ODP站343、642/643、909、910、912和913的岩性在测定地震反射体的年龄以及描述地震单元的岩性方面具有重要意义。

The Neogene opening and subsequent widening of the Fram Strait, the only deep-water connection between the Arctic and Atlantic oceans, was a fundamental tectonic event with extensive consequences for the global ocean circulation and paleoclimate evolution as well as for sedimentation processes in the adjacent ocean basins and along the continental margins. Combining the hereby accumulated sediment archives with seismic mapping and with stratigraphic information from existing DSDP/ODP drill cores will help to unravel the evolution of this deep ocean gateway on tectonic time scales (100.000-1.000.000 yrs). The seismostratigraphic interpretation of sedimentary structures will hence give valuable information on the regional tectonic, oceanographic and paleoclimatic development of this area, amongst others on the glacial history of the Northern Hemisphere. To achieve this, we will use AWI seismic reflection data from the Fram Strait that partially need to be reprocessed. Additionally, we will use external (BGR, NPD, GEUS) seismic reflection data from the adjacent and conjugate continental margins, respectively, that were lately made accessible to us. Our main goal is to identify distinct sediment accumulation mechanisms based on seismic reflection patterns and internal sedimentary geometries. With this information, in turn, we can reconstruct tectonic processes as well as changes in the oceanic circulation in the Fram Strait. Published age models (some of them clearly to be revised during our project) and lithologies from DSDP/ODP sites 343, 642/643, 909, 910, 912 und 913 are substantial in dating seismic reflectors as well as characterizing the seismic units lithologically.