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Reconstruction of palaeo-currents via the investigation of sediment drifts

通过沉积物漂移研究重建古水流

基本信息

批准号：
77944562
负责人：
Dr. Gabriele Uenzelmann-Neben
金额：
--
依托单位：
Bundesanstalt für Geowissenschaften und Rohstoffe (BGR)
依托单位国家：
德国
项目类别：
Priority Programmes
财政年份：
2009
资助国家：
德国
起止时间：
2008-12-31 至 2014-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/77944562?language=en
关键词：
Reconstruction palaeo currents via investigation

项目摘要

The Argentine Basin represents an important path within the global conveyor belt. Cold Antarctic Bottom Water (AABW) takes a northward path as a western boundary current through this basin, and North Atlantic Deep Water (NADW) takes a southern route as a western boundary current. Antarctic Intermediate Water (AAIW) also sets towards the north along the Argentine continental margin (The_Open_University, 1999). The sedimentary sequences at the Argentine continental margin hence represent an important archive of the evolution of those water masses and their modifications (path, physical and chemical properties) e.g. they relate to plate tectonic events such as the opening of the Drake passage or the extensive emplacement of volcanic flows at the Rio Grande Rise/Walvis Ridge. The water masses formed sediment drifts, which document path and intensity of the flow. An identification and detailed analysis and mapping of the drift development in time will shed light on the evolution of the water masses. This in turn will lead to information on the climatic condition during formation. Up to now only the drifts in the central Argentine Basin (e.g. Zapiola Drift) have been investigated. We will concentrate on the continental margin and study long-term (Eocene to Holocene) interaction of the currents with sediment input. The Argentine Basin forms one of the four major basins of the South Atlantic. It opened in Early Cretaceous times (Hinz et al., 1999) and hence built up a long term but high resolution record of the oceanographic-climatic conditions. The proposed project thus ideally tackles the research goals (a) Structure and morphology of the continental margins and shelf areas, (b) The effects of the basin morphology of the Atlantic on the establishment of recent and palaeo-oceanic circulation patterns and climatefeedback, and (c) Erosion and sedimentation processes on- and offshore formulated within the research focus D ‘Sedimentary processes and fluid systems’ of the priority program. The project presented here further links tectonic reconstructions and climate/ocean current simulations.

阿根廷盆地是全球传送带的重要路径。冷南极底水（AABW）以北向路径作为西边界流流经该盆地，北大西洋深水（NADW）以南向路径作为西边界流。南极中层水（AAIW）也沿着阿根廷大陆边缘向北延伸（The_Open_University，1999）。因此，阿根廷大陆边缘的沉积层序代表了这些水团演化及其变化（路径、物理和化学性质）的重要档案。它们与板块构造事件有关，例如德雷克海峡的开放或里奥格兰德隆起/沃尔维斯海岭火山流的广泛就位。水团形成沉积物漂移，记录了水流的路径和强度。对漂移发展的及时识别、详细分析和绘图将有助于了解水团的演变。这反过来又会带来有关形成期间气候条件的信息。到目前为止，仅对阿根廷盆地中部的漂移（例如扎皮奥拉漂移）进行了调查。我们将集中精力研究大陆边缘并研究海流与沉积物输入的长期（始新世至全新世）相互作用。阿根廷盆地是南大西洋四大盆地之一。它于白垩纪早期开放（Hinz 等，1999），因此建立了长期但高分辨率的海洋气候条件记录。因此，拟议项目理想地解决了以下研究目标：（a）大陆边缘和陆架区域的结构和形态，（b）大西洋盆地形态对近代和古海洋环流模式和气候反馈建立的影响，以及（c）在优先计划的研究重点D“沉积过程和流体系统”内制定的陆上和近海侵蚀和沉积过程。这里介绍的项目进一步将构造重建和气候/洋流模拟联系起来。