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

该项目的目标是根据比利牛斯山轴带瓦里斯坎山脉建造中花岗岩类的成因，建立(原)比利牛斯山的演化模型。这应纳入瓦里斯坎造山运动期间冈瓦那陆架区的区域发展。在目前讨论和重新解释瓦里斯坎造山运动期间的区域条件的背景下，出现了新的问题，特别是在比利牛斯山地区。因此，应用目前的模型，例如完全与俯冲带有关的岩浆形成或通过造山运动的重力坍塌而形成的岩浆，是值得怀疑的(见Franke，2014年的讨论)，必须修改和重新解释。越来越多的证据表明岩浆冲量增加，这支持了冈瓦那北部边缘整个地区热流增加的理论。这些影响也可以在瓦里斯卡纳地区的其他地区找到。为了探测华力西基底选定区域可能存在的脉动地幔来源以及与之相关的增加的热流，本项目将致力于以下主要目标：(1)通过对包括辉石在内的锆石的U-Th-Pb年龄谱的评估，确定岩浆脉冲。此外，还将确定形成华力西深成岩体的原始岩浆的寄主岩石的年龄结构。(2)结合REE特征和Lu-Hf同位素识别岩浆形成的地壳级别和可能的原岩。(3)通过创建模式年龄(Lu-Hf)模拟地壳发展。(4)通过显微构造分析对比利牛斯地区外发的主要华力西变形D2期进行时间分类。(5)在所有数据集的解释之后：分别在比利牛斯山北缘的华力西造山时期，证明和建立了图索地幔热柱的影响。

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.