Crustal structure due to collisional and escape tectonics in the Eastern Alps region based on profiles Alp01 and Alp02 from the ALP 2002 seismic experiment
Crustal structure due to collisional and escape tectonics in the Eastern Alps region based on profiles Alp01 and Alp02 from the ALP 2002 seismic experiment
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DOI：
10.1029/2006jb004687
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发表时间：
2007-06-26
影响因子：
3.9
通讯作者：
Thybo, Hans
中科院分区：
文献类型：
--
作者：
Brueckl, Ewald;Bleibinhaus, Florian;Thybo, Hans
Alp01和Alp02是2002年在东阿尔卑斯山进行的一次大型国际地震折射和广角反射实验期间记录到的最长的剖面。Alp01从北向南穿过阿尔卑斯山造山带，提供了一个主要受欧洲和亚得里亚海微板块碰撞影响的剖面。Alp02从东阿尔卑斯山一直延伸到潘尼翁盆地，为阿尔卑斯山地壳结构与构造逃逸到潘尼翁盆地之间的关系提供了证据。在这项实验中，沿这些剖面部署了363个单通道记录器，平均间距为3.2公里。在这项研究中使用了20个内联镜头的录音。使用交互式射线追踪技术的二维正演模拟产生了详细的P波速度模型，其中包含许多具有构造意义的特征。沿着阿尔卑斯山01，欧洲莫霍面一般向南倾斜，在从东部阿尔卑斯山向南部阿尔卑斯山过渡的最大深度下达到47公里。亚得里亚海莫霍面继续向南延伸，深度明显变浅。阿尔卑斯山地区的莫霍面地形和显著的南倾地幔反射体支持了欧洲岩石圈向南俯冲到亚得里亚海微板块下方的观点。Alp02剖面上最显著的构造特征是莫霍面在阿尔卑斯域和潘尼奥域之间的垂直台阶，这表明存在一个独立的潘尼期板块碎片。帕尼翁断片的发育被解释为地壳减薄的结果，这是由于构造从阿尔卑斯碰撞区逃逸到帕尼翁盆地。
Alp01 and Alp02 are the longest profiles recorded during ALP 2002, a large international seismic refraction and wide-angle reflection experiment undertaken in the Eastern Alps in 2002. Alp01 crosses the Alpine orogen from north to south, thus providing a cross section mainly affected by the collision between Europe and the Adriatic microplate. Alp02 extends from the Eastern Alps to the Pannonian basin, supplying evidence on the relation between Alpine crustal structure and tectonic escape to the Pannonian basin. During this experiment, 363 single-channel recorders were deployed along these profiles with an average spacing of 3.2 km. Recordings from 20 inline shots were used in this study. Two-dimensional forward modeling using interactive ray-tracing techniques produced detailed P wave velocity models that contain many features of tectonic significance. Along Alp01, the European Moho dips generally to the south and reaches a maximum depth of 47 km below the transition from the Eastern to the Southern Alps. The Adriatic Moho continues further south at a significantly shallower depth. Moho topography and a prominent south-dipping mantle reflector in the Alpine area support the idea of southward subduction of the European lithosphere below the Adriatic microplate. The most prominent tectonic feature on the Alp02 profile is a vertical step of the Moho at the transition between the Alpine and Pannonian domains, suggesting the existence of a separate Pannonian plate fragment. The development of the Pannonian fragment is interpreted to be a consequence of crustal thinning due to tectonic escape from the Alpine collision area to the Pannonian basin.