Identifying time constraints and mechanisms of crust-mantle coupling in Central European continental lithosphere

浮力大陆地幔根在稳定岩石圈方面发挥着重要作用，但对其组成、年龄以及与地壳的关系知之甚少。地壳被认为主要是在俯冲带产生的，而其他几个地球动力学环境也被提出以促进岩石圈地幔的形成。在这个项目中，我们建议用高精度和高精度的微量元素和同位素方法来研究Eger裂谷沿线的下地壳和次大陆岩石圈地幔。埃格尔地区特别令人感兴趣，因为它横跨两个主要岩石圈地块(萨克苏云期和莫尔达努比亚期)的边界，并在华力西造山期间合并。我们建议研究地壳和地幔包体的地球化学和同位素组成，以比较岩石圈不同部分的岩石成因，并确定可能的关系。埃格裂谷之下的岩石圈也被认为对碱性岩浆作用有贡献，因此该项目的另一部分涉及更好地界定岩浆来源及其区域差异。

The buoyant continental mantle root plays an important role in stabilizing of the lithosphere but its composition and age as well as its relationship to the crust are poorly understood. The crust is believed to be largely generated in subduction zones while several other geodynamic settings have been proposed to facilitate lithospheric mantle generation. In this project we suggest to study the lower crust and subcontinental lithospheric mantle along the Eger Rift with highly precise and accurate trace element and isotope methodologies. The Eger region is particularly interesting because it transverses the boundary of two major lithospheric blocks (the Saxothuringian and the Moldanubian) and has been amalgamated during the Variscan orogeny. We propose to study the geochemical and isotopic composition of crustal and mantle xenoliths in order to compare the petrogenesis of the different parts of the lithosphere and define possible relationships. The lithosphere beneath the Eger Rift is also believed to contribute to the alkaline magmatism and thus another part of the project is concerned with the better definition of magma sources and their regional variation.