Geochronology of the larger Skjoldungen area, South-East Greenland (62° 30' - 64° N) (Volume 2)

This geochronology report is based on samples that were collected during fieldwork in 2011 and 2012 in the Skjoldungen region of South East Greenland. Fieldwork was carried out within the framework of the “SEGMENT” project – a joint project between the National Geological Survey of Denmark and Greenland and The Ministry of Mineral Resources (MMR) in Greenland. Sample preparation and age dating was financed through the SEGMENT project and partly through a post-doc project sponsored by the Willum Foundation to Tomas Næraa.

This report presents zircon U-Pb data on 41 rock samples from the larger Skjoldungen region, which we here define as the area between Bernstorff Isfjord and Timmiarmiut Island (Figure 1), with the aim of characterizing the regional age profile of the felsic rocks. The Archaean basement rocks of this region are collectively described as the Thrym complex, as suggest by Bagas et al. (2013). The results from the 41 samples are listed in Table 1 and each sample is accompanied by a brief description with respect to lithology and field relations, as well as more detailed descriptions of the zircon textures and U-Pb data. This report excludes the rocks related to the Skjoldungen Alkaline Province (SAP) – rocks that can be found in the area around Skjoldungen Island and Kong Skjold Halvø – as these have been reported by Kokfelt et al. (2016). The U-Pb data are presented in two parts: Part 1 covers the northern section from Bernstorff Isfjord down to Helge Halvø (including this) (Figure 4). Part 2 covers the southern section from Kong Dan Halvø to Timmiarmiut Island (Figure 41). The report includes a summary and discussion of the presented age data.