Seismological imaging and evolution of young plate margins and their associated basins.

年轻板块边缘及其相关盆地的地震成像和演化。

• 批准号: 36592-2007
• 负责人: Hall, Jeremy
• 金额: $ 4.38万
• 依托单位: Memorial University of Newfoundland
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2007
• 资助国家: 加拿大
• 起止时间: 2007-01-01 至 2008-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=366553
• 关键词: Seismological; imaging; evolution; young; plate

When the tectonic plates of Earth's surface collide, or are pulled apart, they create deep depressions (that usually fill with sediments) and/or high mountains. This program is about imaging (by advanced echo sounding) and interpreting plate tectonic processes as they occur, or shortly afterwards, in two contrasted areas.The first is the continental edge of Atlantic Canada, which formed by extension and seafloor spreading over 100 million years ago (not long, geologically). This edge preserves a geological record of the events, and hosts significant hydrocarbons. The Newfoundland margin and its Iberian conjugate form a well-studied pair with unusually wide (>100 km) continent-ocean transitions. Recent drilling of the Newfoundland margin found exhumed mantle material, matching similar rocks discovered on the conjugate. Earlier ideas of asymmetrical extension need to be revised! Processing and interpretation of additional seismic data will enable us to delineate the sedimentary basins and transition zones more clearly, and to reconstruct how the margin formed.The second area is the presently-active Cyprus arc in the eastern Mediterranean, which is in transition from subduction to continental collision. Our recent work has documented changing patterns of basin sedimentation and deformation as the convergence direction rotated 45 degrees in the last 15 million years. Now, the intention is to acquire, process and interpret 4000 km of seismic reflection data, at the junction of the Cyprus and Hellenic arcs. Arc junctions are very dynamic plate corners, often the sites of extreme surface relief (e.g., the 5-km deep Rhodes Basin), but poorly understood. These data will provide new insights into the history of this particular corner and, by generalization, into one of the least well-understood aspects of plate interactions.The mechanics of these processes underpin attempts to reduce the natural hazards they pose, and to exploit the resources they may contain. So this research will aid geologists interested in fundamental plate processes, those involved in coping with geological hazards, and those searching for hydrocarbon energy resources.

当地球表面的构造板碰撞或拉开时，它们会产生深层的凹陷（通常充满沉积物）和/或高山。该程序是关于成像（通过先进的回声声音），并在两个对比区域中解释板块构造过程。第一个是加拿大大西洋的大陆边缘，延伸和海底散布在1亿年前（不久的是，地理上）。该边缘保留了事件的地质记录，并拥有重要的碳氢化合物。纽芬兰的边缘及其伊比利亚共轭形成了一对良好的对，具有异常宽（> 100 km）的大陆 - 海洋 - 海洋 - 海洋 - 海洋偏移。最近对纽芬兰边缘的钻孔发现了挖掘的披风材料，与在结合物上发现的类似岩石相匹配。不对称扩展的早期想法需要修改！对其他地震数据的处理和解释将使我们能够更清楚地描绘沉积物盆地和过渡区，并重建边缘的形成方式。第二个区域是目前在东地中海的塞浦路斯弧线，这是从俯冲到大陆碰撞的过渡。我们最近的工作记录了盆地沉积和变形的变化模式，因为在过去的1500万年中，收敛方向旋转了45度。现在，目的是在塞浦路斯和希腊弧线的交界处获取，处理和解释4000公里的地震反射数据。弧形连接是非常动态的板拐角，通常是极端表面浮雕的部位（例如5公里深罗德斯盆地），但了解不足。这些数据将为这个特定角落的历史提供新的见解，并通过概括为板相互作用的最不明显的方面之一。这些过程的机制旨在减少其构成的自然危害，并利用它们可能包含的资源。因此，这项研究将有助于对基本板过程感兴趣的地质学家，涉及应对地质危害的地质学家以及寻找碳氢化合物能源的人。