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

我们的目的是通过对磁重数据的联合分析，提供一个地壳岩性模型，该模型追踪了格陵兰岛从海岸到内陆的露头地质，揭示了亚冰地质。在此，我们首次利用最近最完整的格陵兰岛及其周围的航磁汇编来研究地壳的磁场特性。地壳岩性模型建立在受岩石物性约束的野外解释和联合反演基础上。虽然格陵兰岛的岩石物理采样有限，但我们将整理现有信息，测量我们可用的样本，并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。为此，我们将评估现有的岩石圈尺度模型和最近的层析成像，以建立区域背景。最后，我们得到的模型将用于评估冰盖底部的地热热流的地壳贡献。

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.