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.

我们的目标是通过磁力和重力数据的联合分析提供地壳岩性模型，追踪从海岸到格陵兰岛内部的露头地质，揭示冰下地质。在此，我们首次使用最新且最完整的格陵兰岛及其周边地区的航磁汇编来研究地壳的磁场特性。地壳岩性模型基于受岩石物理性质约束的现场解释和联合反演。虽然格陵兰岛的岩石物理采样有限，但我们将汇编现有信息，测量可用的样本，并用斯堪的纳维亚半岛的数据集补充信息，以获得统计相关的样本数量。对于地壳模型，分辨率适应可用数据集的分辨率。对于完整的地壳模型，我们还考虑地壳厚度和上地幔来源。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确定区域背景。最后，我们得到的模型将用于评估地壳对冰盖底部地热热流的贡献。