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Crustal structure and active tectonics in the Eastern Alps

机译:东阿尔卑斯山的地壳结构和活跃构造

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摘要

During the last decade, a series of controlled source seismic experiments brought new insight into the crustal and lithospheric structure of the Eastern Alps and their adjacent tectonic provinces. A fragmentation of the lithosphere into three blocks, Europe (EU), Adria (AD), and the new Pannonian fragment (PA), was interpreted and a triple junction was inferred. The goal of this study has been to relate these deep crustal structures to active tectonics. We used elastic plate modeling to reconsider the Moho fragmentation. We interpret subduction of EU below AD and PA from north to south and underthusting of AD mantle below PA from southwest to northeast. The Moho fragmentation correlates well with major upper crustal structures and is supported by gravity, seismic, and geodetic data. An analysis of crustal thickening suggests that active convergence is associated with continued thrusting and lateral extrusion in the central Eastern Alps and thickening of the Adriatic indenter under the Southern Alps. According to the velocity relations at the triple junction, PA moves relative to EU and AD along ENE and SE striking faults, mainly by strike slip. An eastward directed extensional component is compensated by the lateral extrusion of the central Eastern Alps. The Periadriatic (Insubric) line east of the triple junction and the mid-Hungarian fault zone have relatively recently lost their role as first-order active structures. We favor the idea that the Pannonian fragment and the TISZA block merged to a "soft" micro-plate surrounded by the Eastern and Southern Alpine, Carpathian, and Dinaric orogens.
机译:在过去的十年中,一系列受控震源地震实验为东阿尔卑斯山及其邻近构造省份的地壳和岩石圈结构带来了新见解。解释了岩石圈破碎成三个块体,分别是欧洲(EU),阿德里亚(AD)和新的Pannonian碎片(PA),并推断出三重连接。这项研究的目的是将这些深层地壳结构与活跃构造联系起来。我们使用弹性板建模来重新考虑Moho碎片。我们从北向南解释在AD和PA下的EU俯冲,从西南到东北解释在PA下的AD地幔下陷。莫霍面碎片与主要的上地壳结构具有很好的相关性,并受到重力,地震和大地测量数据的支持。对地壳增厚的分析表明,活跃的辐合与东部阿尔卑斯山中部的持续冲断和横向挤压以及南部阿尔卑斯山下的亚得里亚海压头的增厚有关。根据三重连接处的速度关系,PA沿ENE和SE走向断裂相对于EU和AD相对运动,主要是走滑。向东延伸的分量通过东部阿尔卑斯山中部的横向挤压得到补偿。在三重交界以东和匈牙利中部断裂带以东的Periadriatic(Insubric)线相对较早地失去了其作为一阶活动结构的作用。我们赞成这样的想法,即潘诺尼纪碎片和TISZA块合并为一块“软”微板块,该板块被东部和南部的高山,喀尔巴阡山脉和二叠纪造山带所包围。

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  • 来源
    《Tectonics》 |2010年第2期|P.TC2011.1-TC2011.17|共17页
  • 作者单位

    Institute of Geodesy and Geophysics, Vienna University of Technology, Gusshausstrasse 27-29, A-1040 Vienna, Austria;

    rnInstitute of Geodesy and Geophysics, Vienna University of Technology, Gusshausstrasse 27-29, A-1040 Vienna, Austria;

    rnDepartment of Geodynamics and Sedimentology, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria;

    rnInstitute for Geophysics, University of Warsaw, ul. Pasteura 7, Warsaw 02-093, Poland;

    rnInstitute of Geophysics, Polish Academy of Sciences, Ks. Janusza 64, Warsaw 01-452, Poland;

    rnSchool of Geology and Geophysics, University of Oklahoma, 100 E. Boyd St., Norman, OK 073019, USA;

    rnDepartment of Geography and Geology, University of Copenhagen, Oster Voldgade 10, Copenhagen K, DK-1350, Denmark;

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