Linking surface kinematics to deep structure of the Adriatic indenter near a potential subduction-polarity switch, the Giudicarie Belt (Southern Alps)

将表面运动学与亚得里亚海压头的深层结构联系起来，该压头靠近潜在的俯冲极性开关，朱迪卡里带（南阿尔卑斯山）

• 批准号: 363465393
• 负责人: Professorin Dr. Eline Le Breton
• 金额: --
• 依托单位: Sektion 2.2: Geophysikalische Abbildung des Untergrunds
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2023-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/363465393?language=en
• 关键词: Linking; surface; kinematics; deep; structure

This seismotectonic study of a transverse zone (Giudicarie Belt, GB) will test the idea that Miocene kinematics at the leading edge of the Adriatic indenter is related to a suspected switch in subduction polarity beneath the Eastern Alps. It challenges conventional notions of uniform-sense subduction of European lithosphere beneath the Alps by attempting to link slab anomalies at the junction of the Central and Eastern Alps with deformation patterns in the crust and at the surface.The object is to trace both active and defunct faults down to lithological, structural and seismological discontinuities in the crust and upper mantle. Prime targets include (1) a potential lithospheric tear (offset) in the vicinity of the GB, (2) a purported crustal wedge in the Tauern Window area, and (3) thrusts extending from the GB and the eastern Southern Alps into the Veneto-Friuli foreland basin. To map the 3D geometry of faults, we will use data from SWATHs C and D, and the AlpArray station network to pinpoint low-magnitude events and to delineate offsets of rock-physical domains (Vp, Vp/Vs, Qp, Qs) by using local earthquake tomography. This will be complimented by state-of-the-art structural and kinematic (fault-slip) analyses of thrust-and-fold zones along 5 lithospheric profiles crossing key parts of the GB and adjacent units of the Southern and Eastern Alps. The results will be integrated with data along the TRANSALP section as well as with with existing thermo-chronological data at the surface to develop a fully 4D model of late Alpine collision and Adriatic indentation.Preliminary work shows that the magnitude and rate of seismicity in the Giudicarie-Veneto-Friuli target area will allow the use of local earthquake tomography, double-difference localization and receiver functions to image the Moho, as well as km-scale shear zones in the crust and upper mantle. The aforementioned lithospheric profiles will be tectonically balanced and the resulting shortening patterns and rates compared with Adria-Europe convergence to see whether the kinematics have remained the same through time, or have changed in response to rotation, and possibly N-directed subduction, of the Adriatic plate.This proposal addresses SPP research themes 1, 3 and 4, and is part of activity fields 1, 3, 4, and 5. Besides its dependence on the densified station swaths and the AlpArray network, it is closely linked to studies in the Eastern Alps and Tauern Window (Pleuger et al., Wolff et al.), and at the transition from Alps to Dinarides (Grützner et al.). Collaboration is national and international, with a co-applicant in Zürich (ETH) and cooperation partners in Austria, Italy, Slovenia and Switzerland.

这种地震构造研究的横向带（Giudicarie带，GB）将测试的想法，中新世运动学在亚得里亚海压头的前缘是一个可疑的开关在俯冲极性下的东阿尔卑斯山。它挑战了欧洲岩石圈在阿尔卑斯山下均匀俯冲的传统概念，试图将阿尔卑斯山中部和东部交界处的板状异常与地壳和地表的变形模式联系起来，目的是追踪地壳和上地幔的岩性、构造和地震学不连续性的活动和失效断层。主要目标包括：（1）GB附近潜在的岩石圈撕裂（偏移），（2）Tauern Window地区的假定地壳楔，以及（3）从GB和南阿尔卑斯山东部延伸到威尼托-弗留利前陆盆地的逆冲断层。为了绘制断层的3D几何形状，我们将使用SWATHS C和D以及AlpArray台站网络的数据来查明低震级事件，并通过使用当地地震层析成像来描绘岩石物理域（Vp，Vp/Vs，Qp，Qs）的偏移。这将通过沿沿着5个岩石圈剖面的逆冲褶皱带的最先进的结构和运动学（断层滑动）分析得到补充，这些剖面穿过GB的关键部分以及南阿尔卑斯山和东阿尔卑斯山的相邻单元。这些结果将与沿着TRANSALP剖面的数据以及地面现有的热年代学数据结合起来，以建立晚期阿尔卑斯碰撞和亚得里亚海凹陷的全四维模型。初步工作表明，朱迪卡里-威尼托-弗留利目标区的地震活动的震级和速率将允许使用当地地震层析成像、双差定位和接收器功能来对莫霍面进行成像，以及地壳和上地幔中千米级的剪切带。将对上述岩石圈剖面进行构造平衡，并将由此产生的缩短模式和速率与亚得里亚-欧洲会聚进行比较，以了解运动学是否随着时间的推移保持不变，或者是否因亚得里亚板块的旋转和可能的N向俯冲而发生变化。和5.除了依赖于加密的台站带和AlpArray网络外，它还与东阿尔卑斯山和陶恩窗的研究密切相关（Pleuger等人，Wolff等人），以及从阿尔卑斯山到Dinarides的过渡处（Grützner等人）。合作是国内和国际的，共同申请人在苏黎世（ETH），合作伙伴在奥地利，意大利，斯洛文尼亚和瑞士。