Deciphering the Dynamics of Continental Deformation in the Arabia-Eurasia Collision Zone

破译阿拉伯-欧亚大陆碰撞带的大陆变形动力学

• 批准号: 0609730
• 负责人: Robert Reilinger
• 金额: --
• 依托单位: Massachusetts Institute of Technology
• 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: 2006-08-15 至 2010-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0609730&HistoricalAwards=false
• 关键词: Deciphering; Dynamics; Continental; Deformation; Arabia

Scientists from the Massachusetts Institute of Technology in collaboration with scientists from Turkmenistan, Azerbaijan, and France are carrying out a GPS investigation in the Caspian Sea region in order to determine the motion of the South Caspian Basin. The plate motion of this portion of the Arabian-Eurasian collision zone is poorly known yet key to understanding the active deformation with the collision zone. Existing data indicate that motions of the westward moving, counter-clockwise rotating Anatolia plate and the counter-clockwise rotating Lesser Caucasus-East Turkey Plateau are inconsistent with current models. This study is exploring the idea that processes associated with subduction of the African lithosphere are fundamentally responsible for the observed motion of Anatolia and the Lesser Caucasus-East Turkey Plateau. Specifically, two hypotheses are being tested: 1) A north-dipping slab is actively sinking beneath the Greater Caucasus, pulling the Lesser Caucasus-East Turkey Plateau northward; 2) The northward motion of the west side of the Lesser Caucasus-East Turkey Plateau is retarded by the rigid oceanic lithosphere of the East Black Sea, while the east side is dragged northward by the northward translating South Caspian block. A network of survey and continuous GPS instruments is being deployed in Turkmenistan and Azerbaijan for four years in order constrain the plate motions in this region.Results from this project will provide a complete kinematic picture of active deformation within the Arabia-Eurasia collision zone and allow determination of the character of strain accumulation along the South Caspian boundary faults, including faults along the west side of the Sea, the Baku-Ashkhabad seismic zone, and the fault systems along the SouthCaspian (Elborz Mountains). This new information will lead to advances in understanding the processes of early continental collision, the consumption of isolated ocean lithosphere within continental collision zones, and the factors that influence the initiation of subduction, slab pull, and lithospheric delamination. A new GPS network will be established and a significant international collaboration will be initiated and will involve training of Turkmenistan and Azerbaijan scientists in GPS techniques and analysis. This project is supported by the Tectonics Program in the Earth Sciences Division and the Europe and Eurasia Program in the Office of International Science and Engineering.

马萨诸塞州理工学院的科学家与土库曼斯坦，阿塞拜疆和法国的科学家合作，正在里海地区进行GPS调查，以确定南海岛盆地的运动。阿拉伯 - 欧拉西亚碰撞区的这一部分的板块运动是鲜为人知的，但对于了解与碰撞区的主动变形的关键。现有数据表明，向西移动的，逆时针旋转的Anatolia板和逆时针旋转的小型高加索 - 土耳其高原的运动与当前模型不一致。这项研究探讨了这样一个观念，即与非洲岩石圈俯冲相关的过程在根本上是构成Anatolia和较小的高加索 - 土耳其高原的运动。具体而言，正在测试两个假设：1）向北倾斜的平板正在大高加索地区积极下沉，将较小的高加索 - 土耳其高原向北拉动； 2）较小的高加索 - 东部土耳其高原的西侧向北运动受到东黑海的僵化的海洋岩石圈的阻碍，而东侧则被向北翻译的南卡西斯山脉向北拖动。调查和连续的GPS仪器网络正在土库曼斯坦和阿塞拜疆部署四年，以限制该地区的板块运动。该项目的反应将提供一个完整的运动学图片，即在阿拉伯 - 欧洲裔碰撞区域内的主动变形，并允许在南部的海库中沿着海拔的海拔区域造成的特征，包括海上沿着海拔的危险，包括bak的特征，包括bak的特征，包括bak的特征，包括有缺陷的情况。地震带和沿Southcaspian（Elborz Mountains）的断层系统。这些新信息将导致理解早期大陆碰撞的过程，大陆碰撞区域内孤立的海洋岩石圈的消费以及影响俯冲启动，平板拉力和岩石圈分层的因素的进展。将建立一个新的GPS网络，并将启动重要的国际合作，并将涉及在GPS技术和分析中对土库曼斯坦和阿塞拜疆科学家进行培训。该项目得到了地球科学部的构造计划，国际科学与工程办公室的欧洲和欧亚大陆计划得到了支持。