Origin and Crustal Expression of Active Lithospheric Delamination in the Vrancea Zone, Romania

罗马尼亚弗朗恰带活跃岩石圈拆沉的成因和地壳表现

• 批准号: 0310118
• 负责人: James Knapp
• 金额: $ 36.26万
• 依托单位: University South Carolina Research Foundation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-07-01 至 2006-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0310118&HistoricalAwards=false
• 关键词: Origin; Crustal; Expression; Active; Lithospheric

Funds from the U. S. National Science Foundation are being used for acquisition and analysis of ~260 km of deep seismic reflection data to illuminate the origin, crustal structure, and three dimensional geodynamic setting of the Vrancea seismogenic zone of Romania. Project DRACULA (Deep Reflection Acquisition Constraining Unusual Lithospheric Activity), a collaboration between the University of South Carolina, the University of Bucharest, and the National Institute for Earth Physics in Romania, is employing deep seismic reflection techniques to (1) map the main structural detachment(s) of the Eastern Carpathians, and their westward continuation into the hinterland, (2) provide reliable constraints from the geometry of crustal reflectors on the postulated existence, position, and polarity of a Miocene-age subduction zone within the Transylvanian crust, (3) elucidate the geometric relationship between active faults in the Carpathian foreland and the seismogenic volume in the mantle, in order to (4) test the hypothesis of mechanical coupling of the foreland crust with Vrancea seismicity, and ultimately, (5) evaluate competing subduction/delamination geodynamic models for the origin of mantle seismicity in the Vrancea zone based on these results. With such data, the Vrancea zone may prove to be a unique setting in which to establish evidence for active continental lithospheric delamination.

来自美国的资金。S.国家科学基金会正在用于获取和分析~260公里的深地震反射数据，以阐明罗马尼亚Vrancea孕震区的起源、地壳结构和三维地球动力学背景。项目DRACULA（深反射采集约束异常岩石圈活动）是南卡罗来纳州大学、布加勒斯特大学和罗马尼亚国家地球物理研究所之间的合作项目，该项目正在采用深地震反射技术来（1）绘制东喀尔巴阡山脉的主要构造拆离及其向西延伸到内陆地区的地图，（2）从地壳反射体的几何学角度，对假定的中新世俯冲带的存在、位置和极性提供了可靠的约束;（3）阐明了喀尔巴阡前陆活动断层与地幔孕震体积之间的几何关系;为了（4）检验前陆地壳与Vrancea地震活动的力学耦合假设，并最终（5）基于这些结果评估Vrancea带地幔地震活动起源的竞争俯冲/拆沉地球动力学模型。有了这样的数据，弗兰恰带可能被证明是一个独特的设置，在其中建立活跃的大陆岩石圈拆沉的证据。