Dynamische Modellierung der Andenorogenesek eingebettet in ein 3D Kugelschalenmodell des Erdmantels

嵌入地幔 3D 球壳模型中的安第斯造山运动动态建模

• 批准号: 105044687
• 负责人: Professor Dr. Jonas Kley
• 金额: --
• 依托单位: Department of Earth and Planetary Science
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/105044687?language=en
• 关键词: Dynamische; Modellierung; der; Andenorogenesek; eingebettet; Dynamische; Modellierung; der; Andenorogenesek; eingebettet

Some essential features of Andean orogenesis cannot be explained only by a dynamic regional model since there are essential influences across its vertical boundaries. A dynamic regional model of the Andes should be embedded in a 3-D spherical-shell model. Because of the energy distribution on the poloidal and toroidal parts of the creeping velocity and because of geologically determined mass transport alongside the Andes, both models have to be 3-D. We developed a new viscosity profile of the mantle with jumps at the lithospheric-asthenospheric boundary and at a depth of 410, 520 and 660 km. Therefore, the challenges to the code Terra are now essentially larger. In the last three years we have resolved these problems in an international cooperation (see 2.2 b)). Based on the new viscosity profile and on the improved Terra, we computed a new forward spherical-shell model [103, 104]. Papers on the improvement of Terra [56, 70] have been submitted. We conceived a regional model of the Andean orogenesis (3.2 b)) with the same new viscosity profile. We want to investigate why there is flat-slab subduction in some segments of the Andes and why deformation of the crust and volcanism migrate eastward. The evolution of the abundances of incompatible elements indicate a cycle which was finished by a fast process, perhaps by a large-scale delamination of the lower plate, perhaps also by another type of delamination. In connection with another spherical-shell model (with prescribed plate boundaries), the regional model should numerically explain why a plateau-type orogen evolved at an oceanic-continental plate boundary.

安第斯造成的一些基本特征不能仅通过动态区域模型来解释，因为其垂直边界存在基本影响。安第斯山脉的动态区域模型应嵌入3-D球形壳模型中。由于蠕变速度的多型和环形部分的能量分布以及与安第斯山脉旁边的地质确定的质量传输，因此这两个模型都必须为3-D。我们开发了地幔的新粘度曲线，在岩石圈 - 心圈边界和410、520和660 km的深度上有跳跃。因此，现在对代码Terra面临的挑战基本上更大。在过去的三年中，我们在国际合作中解决了这些问题（请参见2.2 b））。基于新的粘度曲线和改进的Terra，我们计算了一种新的正向球形壳模型[103，104]。已经提交了有关改善Terra [56，70]的论文。我们构思了具有相同新的粘度曲线的安第斯造成（3.2 b）的区域模型。我们想调查为什么安第斯山脉的某些部分有平板俯冲，以及为什么外壳和火山的变形向东迁移。不兼容元素的丰度的演变表明了一个循环，该循环是通过快速过程完成的，也许是通过大规模分层的下板进行的，也许也是通过另一种类型的分层。与另一个球形壳模型（具有规定的板界边界）有关，区域模型应在数值上解释为什么在海洋 - 汤板边界上演变出高原型造型。