Integrated 3D structural, thermal, gravity and rheological modeling of the Alps and their forelands -INTEGRATE

阿尔卑斯山及其前缘的集成 3D 结构、热力、重力和流变建模 -INTEGRATE

• 批准号: 365307822
• 负责人: Professor Dr. Jörg Ebbing
• 金额: --
• 依托单位: Sektion 4.5: Sedimentbeckenmodellierung
• 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 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/365307822?language=en
• 关键词: Integrated; 3D; structural; thermal; gravity

The aim of this project is to obtain a better understanding of the crust and the uppermost mantle beneath the Alpine orogen and its forelands and to test different hypotheses on the configuration of the subduction system as well as on the distribution of deformation and seismicity. Therefore we plan to integrate the geoscientific observations publicly available so far on properties of the sediments and the crystalline crust (geometry, seismic velocities, and densities) with seismologically derived heterogeneities in the sub-crustal mantle into a consistent data-based 3D structural model that resolves the first order contrasts in physical properties of the units composing the orogen and the forelands. The derived structural model will be constrained by 3D gravity modelling using new petrological concepts and a digital surface density model (3D). Therefore, the resulting density model will be validated by a high-resolution terrestrial gravity/magnetic field compilation and modern satellite data, gravity gradients and magnetic field data. Such a combined model will provide a reference for other types of data processing and is a crucial step forward in deciphering how deep-seated mass changes affect the evolution of the orogen. These 3D models will be used for estimates of GPE (gravitational potential energy) and stresses in addition to investigations of existing isostasy models of the lithosphere and will continuously be extended with the use of the upcoming AlpArray seismological data. A further application is to derive a lithospheric temperature field based on petrological assumptions on the composition of the crust and mantle. This is done to study the effect of regional heat-flow into the Alps and their foreland basins and the flexural regime changes through time, which govern the response to the dynamic evolution of the mountain belt. Starting from these 3D density thermal and lithology models, the integrated strength will be derived and discussed in the context of stress and deformation fields. The project contributes to Themes 3 and 4 of the call for proposals: For Theme 3: deformation of the crust and mantle during mountain building, the project will provide the configuration of the different crustal units and of the lithospheric mantle and the isostatic and rheological conditions of the orogen-foreland system. For Theme 4: motion patterns and seismicity, the outcome of the proposed project will support identifying spatial patterns of faulting and seismicity in relation to the rheological configuration, the variations of flexural rigidity across the system and the distribution of contrasts in physical properties in the crust as well as the lithospheric mantle. In response to its regional character, the project links with the different activity fields of the SPP and a continuous exchange of results with many working groups in the SPP will support data processing and interpretation.

该项目的目的是更好地了解阿尔卑斯造山带及其前地之下的地壳和上地幔，并检验关于俯冲系统的结构以及变形和地震活动分布的各种假设。因此，我们计划将迄今为止公开的关于沉积物和结晶地壳（几何形状、地震速度和密度）的性质的地球科学观测与地壳下地幔中地震学衍生的非均匀性整合到一个一致的基于数据的3D结构模型中，该模型解决了构成造山带和前陆的单元的物理性质的一阶对比。所得出的结构模型将受到使用新的岩石学概念和数字表面密度模型（3D）的3D重力建模的约束。因此，将通过高分辨率地球重力/磁场汇编和现代卫星数据、重力梯度和磁场数据来验证由此产生的密度模型。这样一个组合模型将为其他类型的数据处理提供参考，也是破译深层物质变化如何影响造山带演化的关键一步。这些3D模型将用于GPE（重力势能）和应力的估计，以及对岩石圈现有等值线模型的研究，并将随着即将到来的AlpArray地震数据的使用而不断扩展。另一个应用是根据岩石学对地壳和地幔组成的假设推导岩石圈温度场。这样做是为了研究区域热流进入阿尔卑斯山及其前陆盆地和弯曲制度的变化，随着时间的推移，这支配的动态演化的山区带的响应的影响。从这些三维密度热和岩性模型出发，将在应力场和变形场的背景下推导和讨论综合强度。该项目对征集建议书的主题3和4作出贡献：关于主题3：造山过程中地壳和地幔的变形，该项目将提供不同地壳单元和岩石圈地幔的结构以及造山带-前陆系统的均衡和流变条件。主题4：通过研究地壳运动模式和地震活动，拟议项目的成果将有助于确定断层和地震活动与流变学结构、整个系统抗弯刚度的变化以及地壳和岩石圈地幔物理性质差异的分布有关的空间模式。鉴于其区域性，该项目与最高人民委员会的不同活动领域建立了联系，并与最高人民委员会的许多工作组不断交流成果，以支持数据处理和解释。