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

汤姆森地中海是许多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融合的大陆板块之间，在碰撞发生并迫使系统重组之前，它们只能独立运动一段有限的时间。在复杂的、退缩的、停滞的和沉没的地中海俯冲带中，卡拉布里亚是最有趣的一个。它继续俯冲海洋岩石圈，但在更新世，收敛似乎已经停止，隆升似乎已经加速。在亚得里亚海俯冲系统中，现代隆升率是最高的。本项目将集中运用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GPS大地测量学）研究这一问题；首先，通过改进水平和垂直运动的观测结果，第二，通过将这些观测结果与上地幔、岩石圈和地壳变形的地球动力学模型联系起来。关键是将地表观测与潜在的地球动力学联系起来。卡拉布里亚弧是俯冲和大陆台地碰撞导致上板块快速隆起和变形的一个突出例子。它的小尺寸使它成为一个易于操作的野外实验室，用于研究所有俯冲带的重要过程，包括分析驱动和抵制俯冲的力量及其在板块运动和地表隆起中的表现。国际PI团队将整合和扩展必要的实地观测和建模，以(1)了解卡拉布里亚为什么正在经历持续的快速隆起，(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。理解卡拉布里亚为什么会上升以及为什么会减缓其水平运动的困惑，对驱动和阻碍板块运动的过程具有广泛的意义。

0607605ThomsonThe 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.