Crustal and lithosheric structure of the subducting Adriatic Plate and the external accretionary wedge in the soutern Dinarides

俯冲亚得里亚海板块的地壳和岩石结构以及迪纳里德南部的外部增生楔

• 批准号: 210250417
• 负责人: Professor Dr. Thorsten Nagel
• 金额: --
• 依托单位: Institut für Geologie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/210250417?language=en
• 关键词: Crustal; lithosheric; structure; subducting; Adriatic

We propose to install two profiles of geophones in Montenegro during the active offshore experiment Alpha (Adria lithosphere investigation) which is scheduled for the research vessel FS Meteor in January-February 2012. These profiles will extend the offshore OBS (ocean bottom seismometer) profiles in the Adriatic Sea to implement a shoreline-crossing amphibious study. Offshore and onshore stations will record the airgun shots generated during the active seismic experiment onboard FS Meteor. The combined data will allow imaging the crustal and lithospheric structure not only of the Adriatic Plate offshore but also of the complete region of plate bending, and the subducting portion of the plate including the active accretionary wedge of the external Dinarides on top. This amphibious campaign would be the first refraction-based tomographic section through the orogenic system. This system is of particular interest as (1) it represents one of the few retreating subduction zones, which has consumed continental lithosphere for a long time and (2) the transition from compression at the front and extension within the wedge occurs over an extremely short distance with considerable thrustand normal-fault earthquakes being located only about 30 kilometres apart from each other. The parameters controlling these processes are largely unknown and this low-cost study will provide fundamental constraints for understanding the underlying mechanics and lithosphere geometry.

我们建议在定于2012年1月至2月在FS Meteor号研究船上进行的主动海上实验Alpha（Adria岩石圈调查）期间，在黑山安装两个地震检波器剖面。这些剖面图将扩展亚得里亚海的近海海底地震仪剖面图，以进行跨越海岸线的两栖研究。海上和陆上台站将记录FS Meteor上主动地震实验期间产生的气枪射击。合并后的数据将允许成像的地壳和岩石圈结构，不仅亚得里亚海板块离岸，而且板块弯曲的整个区域，和板块的俯冲部分，包括外部Dinarides顶部的活跃增生楔。这一两栖战役将是第一个通过造山系统的基于折射的层析成像部分。这个系统特别令人感兴趣，因为（1）它代表了少数几个后退俯冲带之一，它已经消耗了大陆岩石圈很长一段时间，（2）从楔体前部的压缩到楔体内部的伸展的过渡发生在极短的距离上，相当多的逆冲断层和正断层地震彼此相距仅约30公里。控制这些过程的参数在很大程度上是未知的，这种低成本的研究将提供基本的限制，了解基本的力学和岩石圈几何形状。