Geodynamic evolution of the NE Gondwana margin in the area of the Pyrenees: Chronology of granitoid placements and their geochemical and structural signatures.

该项目的目标是建立一个（原）比利牛斯山脉的演化模型，该模型基于比利牛斯山脉轴带Variscan山脉形成背景下的花岗岩成因。这应与瓦里斯坎造山运动时期冈瓦纳陆架地区的区域发展相结合。在目前讨论和重新解释Variscan造山运动期间的区域条件的背景下，特别是在比利牛斯山脉地区出现了新的问题。因此，当前模型的应用，如岩浆形成只与俯冲带或造山运动的重力崩塌有关，是值得怀疑的（见Franke， 2014的讨论），必须重新加工和重新解释。越来越多的证据表明岩浆脉冲增加，这支持了冈瓦纳北部边缘整个地区热通量增加的理论。这些影响也可以在瓦里斯坎地区的其他地区发现。为了在Variscan基底的特定区域探测可能的脉动地幔源和与之相关的热通量增加，本项目将实现以下主要目标：(1)通过评估锆石（包括xenochrys）的U-Th-Pb年龄谱来识别岩浆脉冲。此外，还将确定形成Variscan岩体原始岩浆的寄主岩石的年龄结构。(2)结合稀土元素特征和Lu-Hf同位素识别岩浆形成的地壳水平和可能的原岩。(3)通过建立模式年龄（Lu-Hf）模拟地壳发育。(4)利用显微结构分析对比利牛斯山脉外向Variscan主变形相D2的时间分类。(5)在对所有数据集进行解释后：证明了在比利牛斯山脉地区，分别是冈瓦纳北缘，在Variscan造山运动期间TUZO地幔柱的影响和模型的发展。

The goal of the project is a model for the evolution of the (proto-) Pyrenees based on the genesis of granitoids in the context of the Variscan mountain formation in the Axial Zone of the Pyrenees. This should be integrated into the regional development of the Gondwana shelf area during the Variscan orogeny. In the context of the current discussions and reinterpretation of regional conditions during the Variscan orogeny new questions have arisen especially in the area of the Pyrenees. Thus, an application of the current models, such as magma formation exclusively in connection with subduction zones or by gravitational collapse of the orogeny is questionable (see discussion in Franke, 2014) and must be reworked and reinterpreted. More and more evidence for increased magmatic impulses is found, which supports the theory of an increased heat flux in the entire area of Gondwana's northern rim. These effects can also be found in other areas of the Variscan zone. In order to detect a possible pulsating mantle source and the associated increased heat flux in selected areas of the Variscan basement, the following main objectives are to be pursued in this project:(1) Magmatic pulses shall be identified by the evaluation of U-Th-Pb age spectra from zircons, including xenochrysts.Additionally, the age structures of the host rocks from which the original magma for the Variscan plutons was formed will be identified. (2) The identification of crustal levels of magma formation and identification of possible protoliths using a combination of REE signatures and Lu-Hf isotopes.(3) Modelling of the crustal development by creating model ages (Lu-Hf).(4) Temporal classification of the outgoing main Variscan deformation phase D2 in the Pyrenees by analysis of microstructures.(5) After interpretation of all data sets: Proof and model development of an influence of the TUZO mantle plume during the period of the Variscan orogeny in the area of the Pyrenees, respectively the Gondwana Northern margin.