Yasmina M. Martos

TL;DR: In this article, a high-resolution heat flux map and associated uncertainty derived from spectral analysis of the most advanced continental compilation of airborne magnetic data is presented, with small-scale spatial variability and features consistent with known geology are better reproduced than in previous models, between 36% and 50%.

TL;DR: In this paper, a review brings together recent literature highlighting the known processes and feedbacks that influence the stability of the Antarctic Ice Sheet (AIS) and its response to climate change.

TL;DR: The second generation Antarctic magnetic anomaly compilation for the region south of 60°S includes some 3.5 million line-km of aeromagnetic and marine magnetic data that more than doubled the initial map's near-surface database as discussed by the authors.

TL;DR: In this paper, a model comprising four tectonic evolutionary phases is proposed: Phase I, Pacific subduction, Phase II, ridge jumping and western Ona back-arc spreading, early Oligocene; and Phase IV, Ridge jumping and West Scotia Ridge spreading, mid-to-late Miocene.

Abstract: Curie depths beneath Greenland are revealed by spectral analysis of data from the World Digital Magnetic Anomaly Map 2. A thermal model of the lithosphere then provides a corresponding geothermal heat flux map. This new map exhibits significantly higher frequency but lower amplitude variation than earlier heat flux maps and provides an important boundary condition for numerical ice-sheet models and interpretation of borehole temperature profiles. In addition, it reveals new geologically significant features. Notably, we identify a prominent quasi-linear elevated geothermal heat flux anomaly running northwest–southeast across Greenland. We interpret this feature to be the relic of the passage of the Iceland hotspot from 80 to 50 Ma. The expected partial melting of the lithosphere and magmatic underplating or intrusion into the lower crust is compatible with models of observed satellite gravity data and recent seismic observations. Our geological interpretation has potentially significant implications for the geodynamic evolution of Greenland. Plain Language Summary Heat escaping from the Earth’s interior provides important clues about areas of geology and geodynamics. In addition, where a region is covered by an ice sheet, such as Greenland, variations in the heat supplied from the Earth’s interior can potentially influence how the ice flows, and hence its future changes. Unfortunately, in ice covered regions direct measurements of heat flow are limited to sparse boreholes, meaning this important quantity is poorly understood. In this study we used variations in the Earth’s magnetic field to map out the variations in the amount of heat being supplied to the base of the Greenland Ice Sheet from the Earth’s interior. Ice sheet models incorporating these new and improved results will help better constrain future predictions of ice sheet evolution. Overall, the new map not only shows less extreme variations than previous studies, but also reveals a previously unseen band of warmer than expected rock stretching northwest to southeast across Greenland. This band, together with lithospheric models derived from gravity data, is interpreted to be the scar left as the Greenland tectonic plate moved over a region of hot upwelling mantle (the material beneath the tectonic plates), which now underlies Iceland.