FB-4D: Foreland basin evolution records the effects of plate reorganization, surface evolution and crustal deformation on mountain building

我们的目标是帮助我们理解今天阿尔卑斯山的深层结构，它的演化和表面对深层过程的响应。造山带中逆冲片叠加的热年代学信号可以盖过与地幔过程有关的细微信号，而前陆盆地则记录了大波长的下沉或隆升。我们建议使用Molasse盆地的数据来限制地幔动力学对地表演化的贡献。阿尔卑斯山的构造力和地幔过程沿走向变化很大，在邻近前陆盆地的埋藏和折返历史中的表现也是如此。作为一个典型的前陆盆地，莫拉塞盆地在新近纪经历了大规模的折返(约2-3公里)，这只能部分地用已知的构造作用来解释。整个盆地已经被挖掘到足以让低温温度计以高分辨率绘制出挖掘时间和速率的程度。我们的目标是在盆地西部工作的基础上，利用沿三个断面的低温热年代学来量化莫拉塞盆地中部的折返历史。我们将使用专门为研究沉积盆地和构造重建而设计的新的概率热模型来量化折返的时间和速度。通过这种组合，我们将量化构造、气候和地幔驱动因素对Molasse盆地折返的贡献，并为检验SPP的主要假说提供必要的输入。本提案与研究专题RT-1、RT-2和RT-4相联系，并被置于活动领域E，与小水线模型D的成果密切相关。

We aim to contribute to our understanding of the present day deep structure of the Alps, its evolution and the surface response to deep seated processes. Whereas the thermochronological signal of the stacking of thrust sheets in the orogen can overwhelm subtle signals related to mantle processes, the foreland basin records large-wavelength subsidence or uplift. We propose to use data from the Molasse basin to constrain the contribution of mantle dynamics to surface evolution. Tectonic forces and mantle processes vary strongly along strike in the Alps, and so does their expression in the burial and exhumation history of the adjacent foreland basin. Following its initial stage as a classical foreland basin, the Molasse basin has undergone substantial exhumation (~2-3 km) during the Neogene, which can only partly be explained by known tectonic processes. The entire basin has been exhumed to a degree that is sufficient for low-temperature thermochronometers to map the timing and rate of exhumation at high resolution. We aim to build on our work in the western part of the basin to quantify the exhumation history of the central Molasse Basin using low-temperature thermochronology along three transects. We will quantify the timing and rate of exhumation using a new probabilistic thermal model specifically designed for studies of sedimentary basins in combination with tectonic reconstructions. With this combination, we will quantify the contribution of tectonic, climatic and mantle drivers to exhumation of the Molasse basin and provide essential input to testing the main hypothesis of the SPP. This proposal links to the research themes RT-1, 2 and 4, and is placed in Activity Field E with close link to results from Swath D.