GreenCrust: Tracing a Greenland’s crustal structure under the ice with geophysical inversion and an assessment of geothermal heat flow

GreenCrust：通过地球物理反演和地热流评估追踪格陵兰岛冰下的地壳结构

• 批准号: 459524577
• 负责人: Professor Dr. Jörg Ebbing
• 金额: --
• 依托单位: Sektion Geophysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/459524577?language=en
• 关键词: GreenCrust; Tracing; Greenland; crustal; structure

We aim at providing a model of the crustal lithology from the joint analysis of the magnetic and gravity data that traces the outcropping geology from the coast into the interior of Greenland revealing the sub-ice geology. Hereby, we use for the first time a recent and most complete aeromagnetic compilation of Greenland and its surroundings to study the magnetic field properties of the crust. The crustal lithology model is based on field interpretation and joint inversion constrained by petrophysical properties. While petrophysical sampling is limited over Greenland, we will compile the existing information, measure samples available to us and supplement the information with data sets from Scandinavia to have a statistical relevant sample number. For the crustal model, the resolution is adaptive to the resolution of the available data sets. For a complete crustal model, we consider as well crustal thickness and upper mantle sources. For this, we will evaluate existing lithospheric-scale models and recent tomography to establish the regional setting. At the end, our resulting models will be used to assess the crustal contribution to geothermal heat flow at the base of the ice-sheets.

我们的目标是提供一个模型的地壳岩性的磁和重力数据的联合分析，跟踪从海岸到格陵兰岛内部露出地面的地质揭示冰下地质。在此，我们首次使用格陵兰岛及其周围地区最新的、最完整的航磁资料来研究地壳的磁场特性。地壳岩性模型建立在野外解释和岩石物性约束下的联合反演基础上。虽然岩石物理采样仅限于格陵兰岛，但我们将汇编现有信息，测量我们可用的样本，并使用斯堪的纳维亚的数据集补充信息，以获得统计相关的样本数量。对于地壳模型，分辨率与现有数据集的分辨率相适应。对于一个完整的地壳模型，我们还考虑了地壳厚度和上地幔源区。为此，我们将评估现有的岩石圈尺度模型和最近的断层扫描，以建立区域设置。最后，我们得到的模型将被用来评估地壳的贡献，地热流的基础上的冰盖。