Investigation of the exhumation mechanisms of the axial core of a collisional orogen, by means of structural analysis of brittle deformation and of thermochronology in the Eastern Alps.

东阿尔卑斯山的第三纪发掘仍然局限于一个有限的区域内（陶恩窗），从第三纪早期到中新世晚期。根据以前的和新的热年代学调查，该地区的冷却模式将被构建，特别注意的三维几何形状的等时线，三维几何形状的伸展断层面，和三维几何形状的大规模褶皱之间的关系。这些空间关系将被用来限制剥露机制，即拉伸去顶与褶皱和侵蚀的贡献。通过对伸展去顶、褶皱和侵蚀等端元折返类型的热模型以及混合型模型的比较，将使我们能够量化每种机制对整体折返的贡献。考虑到脆性变形通常在岩石经历脆-韧性转变之后开始，其温度大致由锆石裂变径迹的退火温度定义，我们将通过测量锆石裂变径迹来确定脆性结构的最大年龄。这些年龄与脆性变形的结构分析相结合，将使我们能够重建中晚中新世的运动学和古应力场的轴向核心的东阿尔卑斯山，并约束后期的折返机制。

Tertiary exhumation of the Eastern Alps remained localised within a restricted area (Tauern Window) from the early Tertiary to the Late Miocene. Based on previous and new thermo-chronological investigations the cooling patterns of this area will be constructed, with special attention to the relationship between the 3-D geometry of the isochrones, the 3-D geometry of the extensional fault planes, and the 3-D geometry of the large scale folds. These spatial relationships will be used to constrain the mechanisms of exhumation, i.e. the contribution of extensional unroofing vs. folding and erosion. The comparison of thermal models of endmember- types of exhumation by extensional unroofing and by folding and erosion, in addition to mixed-type models, will allow us to quantify the contribution of each mechanism to the bulk exhumation.Considering that brittle deformation generally starts after the rocks passed through the brittle-ductile transition, whose temperature is approximately defined by the annealing temperature of zircon fission tracks, we will define the maximum age of brittle structures by measuring zircon fission tracks. These ages combined with a structural analysis of brittle deformation will allow us to reconstruct the middle- to late Miocene kinematics and paleostress fields of the axial core of the Eastern Alps, and to constrain the late mechanisms of exhumation.