Collaborative Research: Uplift and faulting at the transition from subduction to collision - a field and modeling study of the Calabrian Arc

合作研究：从俯冲到碰撞过渡时的隆起和断层——卡拉布里亚弧的现场和建模研究

• 批准号: 0607687
• 负责人: Michael Steckler
• 金额: $ 176.46万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-08-01 至 2014-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0607687&HistoricalAwards=false
• 关键词: Collaborative; Research; Uplift; faulting; transition

0607687StecklerThe Mediterranean Sea is the location of a number of inactive or failing subduction systems. Confined between the slowly converging landmasses of Eurasia and Africa, the Mediterranean microplates and their subduction systems can move independently only for a limited time before a collision ensues and forces a reorganization of the system. Of the complex, retreating, stalling and foundering subduction zones of the Mediterranean, Calabria is one of the most intriguing. It continues to subduct oceanic lithosphere, yet convergence appears to have stalled and uplift appears to have accelerated in the Pleistocene. Modern uplift rates are some of the highest in the Adriatic subduction systems. This project will focus an array of modern analysis techniques (quaternary geochronology, geomorphology, sedimentology, structural geology, seismicity, thermochronology, and GPS geodesty) on this problem; first, by refining the observations of horizontal and vertical motions back through time and second, by linking these to geodynamic models of upper mantle, lithospheric and crustal deformation. The key will be to connect the surface observations to the underlying geodynamics.The Calabrian arc represents an outstanding example of subduction and continental platform collision leading to rapid uplift and deformation of the upper plate. Its small size makes it a tractable field laboratory in which to study processes important to all subduction zones, including analysis of the forces driving and resisting subduction and their manifestations on plate motion and surface uplift. The international PI team will integrate and extend the field observations and modeling necessary to (1) understand why Calabria is undergoing sustained rapid uplift, and (2) explore the implications for processes at depth. These surface and near-surface observations will be combined with analysis of the deeper structure provided by the previously funded CD CAT/SCAN passive seismic experiment. Understanding the puzzle of why Calabria is being uplifted and why it has slowed its horizontal motion has broad implications for the processes that drive and impede plate motions.

0607687 Steckler地中海是一些不活跃或失败的俯冲系统的所在地。 地中海微板块和它们的俯冲系统被限制在欧亚大陆和非洲缓慢会聚的陆块之间，在碰撞包围并迫使系统重组之前，它们只能在有限的时间内独立移动。 在地中海复杂的、后退的、停滞的和沉没的俯冲带中，卡拉布里亚是最有趣的一个。 它继续俯冲海洋岩石圈，但收敛似乎已经停止，隆升似乎在更新世加速。 现代抬升速率是亚得里亚海俯冲系统中最高的。 该项目将集中一系列现代分析技术（第四纪地质年代学、地貌学、沉积学、构造地质学、地震活动性、热年代学和全球定位系统大地测量学）来解决这一问题;首先，通过改进对水平和垂直运动的观测，追溯时间;其次，将这些观测与上地幔、岩石圈和地壳变形的地球动力学模型联系起来。 卡拉布里亚弧是俯冲和大陆平台碰撞导致上板块迅速隆起和变形的突出例子。 它的小尺寸使其成为一个易于操作的现场实验室，在其中研究对所有俯冲带都很重要的过程，包括分析驱动和抵抗俯冲的力量及其对板块运动和地表隆起的表现。 国际PI团队将整合和扩展必要的实地观察和建模，以（1）了解卡拉布里亚为什么正在经历持续快速的隆升，以及（2）探索深度过程的影响。 这些地表和近地表观测将与先前资助的CD CAT/SCAN被动地震实验提供的深层结构分析相结合。 了解卡拉布里亚为何隆起，为何水平运动减慢的谜团，对推动和阻碍板块运动的过程有着广泛的意义。