Scaled analogue modelling of syn-orogenic, extensional fault systems

同造山、伸展断层系统的比例模拟模型

• 批准号: 5405049
• 负责人: Professor Dr. Claudio Rosenberg
• 金额: --
• 依托单位: Institut des Sciences de la Terre de Paris (ISTeP) - UMR 7193
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2003
• 资助国家: 德国
• 起止时间: 2002-12-31 至 2003-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5405049?language=en
• 关键词: Scaled; analogue; modelling; syn; orogenic

Crustal-scale extension is inferred to occur during convergence in several orogens. This type of extension may not lead to a net thinning of the crust and therefore, isostatically-driven uplift of the footwall may not occur. Hence, the geometry of the footwall and its exhumation may differ from those of purely extensional systems. Boundary conditions inferred for the Tertiary Alpine extensional systems are used to simulate syn-contractional faulting in analogue experiments scaled for density and viscosity. During these experiments, a 4-layered orogenic zone will be differentially thickened by indentation of rigid bodies with various shapes. The rheological layering of the orogenic zone will be modified from one experiment one experiment to the other in order to test the effect of a strong vs. weak mantle on the initiation and style of extension. Serial cross sections of the models, made at different increments of deformation, will show the evolution of the 3-D structure of a syn-orogenic extensional system through time.

地壳尺度的伸展被推断发生在收敛在几个造山带。这种类型的伸展可能不会导致地壳的净减薄，因此，均衡驱动的下盘隆起可能不会发生。因此，下盘的几何形状及其折返可能不同于那些纯粹的伸展系统。边界条件推断的第三阿尔卑斯山伸展系统用于模拟同收缩断层的模拟实验缩放的密度和粘度。在这些实验中，一个4层造山带将被不同形状的刚体压入而不同地增厚。造山带的流变分层将从一个实验到另一个实验进行修改，以测试强地幔与弱地幔对伸展的启动和样式的影响。在不同的变形增量下制作的模型的系列横截面将显示同造山伸展系统的三维结构随时间的演化。