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

确定中欧大陆岩石圈壳幔耦合的时间限制和机制

• 批准号: 169883007
• 负责人: Professor Dr. Karsten Matthias Haase, since 9/2010
• 金额: --
• 依托单位: Department of Earth, Ocean, and Atmospheric Science
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/169883007?language=en
• 关键词: Identifying; time; constraints; mechanisms; crust

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.

具有浮力的大陆地幔根在岩石圈稳定中起着重要作用，但其组成、年龄及其与地壳的关系却知之甚少。地壳被认为主要是在俯冲带中产生的，而其他几个地球动力学环境已被提出，以促进岩石圈地幔的生成。在本项目中，我们建议用高精度和高精度的微量元素和同位素方法研究埃格裂谷的下地壳和沿着大陆岩石圈地幔。埃格地区特别有趣，因为它横跨两个主要岩石圈块体（Saxothurian和Moldanubian）的边界，并在华力西造山运动期间合并。我们建议研究地壳和地幔捕虏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有助于碱性岩浆作用，因此该项目的另一部分涉及更好地定义岩浆源及其区域变化。