Evaluation of stress and strain rates in the lithosphere of Europe based on high resolution thermodynamic model coupled with mantle convection model.

基于高分辨率热力学模型与地幔对流模型相结合的欧洲岩石圈应力和应变率评估。

• 批准号: 240563653
• 负责人: Dr. Alexey Petrunin
• 金额: --
• 依托单位: Helmholtz-Zentrum Potsdam - Deutsches GeoForschungsZentrum (GFZ)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/240563653?language=en
• 关键词: Evaluation; stress; strain; rates; lithosphere

The total stress field within the lithosphere represents a sum of the stresses originated at plate boundaries, global mantle flow at the bottom and local stresses largely related to the heterogeneous lithosphere structure. Existing numerical stress models for Europe have been developed taking into account chiefly plate boundary forces, which magnitude is not well determined, and considering oversimplified rheology models and lithospheric structure. However, other factors, e.g. influence of the vertical and horizontal forces caused by mantle convection and post-glacial relaxation, as well as strong lateral heterogeneity of the lithosphere and topography are not well considered in the models. The main goal of the study is calculation of the lithospheric stress field of Europe taking into account all the major factors. This shall be done by means of 3D high-resolution thermo-mechanical and density model of the lithosphere coupled with the global mantle convection model. Based on recent structural and rheological models and using the finite-volume approach (code LAPEX 3D, which operates with temperature- and stress-dependent visco-elasto-plastic rheology) we are going to develop a spatial multi-scale (nested mesh) technique to avoid uncertainties in boundary conditions and refine domains with high-gradient physical fields (strain rate, stress). Reliability of the final model will be evaluated by comparison with GPS data, experimental stress determinations and other available data.

岩石圈内部的总应力场是起源于板块边界的应力、底部的全球地幔流应力和与岩石圈非均匀结构有关的局部应力的总和。欧洲现有的数值应力模型主要考虑了板块边界力，其大小还没有很好地确定，并考虑了过于简化的流变模型和岩石圈结构。然而，其他因素，如地幔对流和冰后期松弛引起的垂直和水平力的影响，以及岩石圈和地形的横向不均匀性没有很好地考虑在模型中。这项研究的主要目标是计算欧洲的岩石圈应力场，同时考虑到所有主要因素。这将通过与全球地幔对流模型相结合的岩石圈三维高分辨率热-力学和密度模型来完成。基于最近的结构和流变模型，并使用有限体积法（代码LAPEX 3D，它与温度和应力相关的粘弹塑性流变学），我们将开发一个空间多尺度（嵌套网格）技术，以避免边界条件的不确定性和细化域与高梯度物理场（应变率，应力）。最后模型的可靠性将通过与全球定位系统数据、实验应力测定和其他现有数据进行比较来评估。

项目成果

Effects of the postperovskite phase change on the observed geoid

后钙钛矿相变对观测到的大地水准面的影响

• DOI: 10.1002/2014gl060255
• 发表时间: 2015
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: Shahraki;Schmeling;​Kaban;M. K.​;​Petrunin;A. G.​
• 通讯作者: A. G.​

Variations of the effective elastic thickness reveal tectonic fragmentation of the Antarctic lithosphere

有效弹性厚度的变化揭示了南极岩石圈的构造破碎

• DOI: 10.1016/j.tecto.2017.06.012
• 发表时间: 2017-06
• 期刊: Tectonophysics
• 影响因子: 2.9
• 作者: Bo Chen;Carina Haeger;Mikhail K. Kaban;Alexey G. Petrunin
• 通讯作者: Alexey G. Petrunin

Melting at the base of the Greenland ice sheet explained by Iceland hotspot history

• DOI: 10.1038/ngeo2689
• 发表时间: 2016-05
• 期刊: Nature Geoscience
• 影响因子: 18.3
• 作者: I. Rogozhina;A. Petrunin;A. Vaughan;B. Steinberger;Jesse Johnson;M. Kaban;R. Calov;F. Rickers;Maik Thomas;I. Koulakov

Strength and elastic thickness variations in the Arabian Plate: A combination of temperature, composition and strain rates of the lithosphere

阿拉伯板块的强度和弹性厚度变化：岩石圈温度、成分和应变率的组合

• DOI: 10.1016/j.tecto.2017.03.004
• 发表时间: 2017
• 期刊: Tectonophysics
• 影响因子: 2.9
• 作者: Tesauro;​Kaban;M. K.​;​Petrunin;A. G.​;El Khrepy;Al-Arifi
• 通讯作者: Al-Arifi

Cratonic root beneath North America shifted by basal drag from the convecting mantle

• DOI: 10.1038/ngeo2525
• 发表时间: 2015-10
• 期刊: Nature Geoscience
• 影响因子: 18.3
• 作者: M. Kaban;W. Mooney;A. Petrunin