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

弗拉姆海峡的开放及其对北冰洋和北大西洋之间沉积物输送、气候和海洋环流的影响

• 批准号: 386446274
• 负责人: Dr. Wolfram Geissler
• 金额: --
• 依托单位: Sektion Geophysik
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/386446274?language=en
• 关键词: Opening; Fram; Strait; its; influence

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.

弗拉姆海峡是北冰洋和大西洋之间唯一的深水连接点，新近纪的开口和随后的拓宽是一次基本的构造事件，对全球海洋环流和古气候演化以及邻近洋盆和大陆边缘的沉积过程产生了广泛的影响。将由此积累的沉积物档案与地震测绘以及现有 DSDP/ODP 钻芯的地层信息相结合，将有助于揭示这个深海门户在构造时间尺度（100.000-1.000.000 年）上的演化。因此，沉积结构的地震地层解释将为该地区的区域构造、海洋学和古气候发展以及北半球冰川历史提供有价值的信息。为了实现这一目标，我们将使用来自弗拉姆海峡的 AWI 地震反射数据，该数据部分需要重新处理。此外，我们将使用最近获得的分别来自相邻大陆边缘和共轭大陆边缘的外部（BGR、NPD、GEUS）地震反射数据。我们的主要目标是根据地震反射模式和内部沉积几何形状确定不同的沉积物堆积机制。反过来，利用这些信息，我们可以重建构造过程以及弗拉姆海峡海洋环流的变化。 DSDP/ODP 站点 343、642/643、909、910、912 和 913 已发布的年龄模型（其中一些模型显然将在我们的项目期间进行修订）和岩性对于地震反射体的测年以及地震单元岩性的表征具有重要意义。