Palaeovalleys at the basal unconformity of the Palaeoproterozoic Karrat Group, West Greenland

• Published in: Geological Survey of Denmark and Greenland (GEUS) Bulletin
• Main Authors: Guarnieri, Pierpaolo, Partin, Camille A., Rosa, Diogo
• Format: Article in Journal/Newspaper
• Language: English
• Published: Geological Survey of Denmark and Greenland (GEUS) 2016
• Subjects: Greenland
• Online Access: https://geusbulletin.org/index.php/geusb/article/view/4940; https://doi.org/10.34194/geusb.v35.4940

In the Rinkian belt of West Greenland, reworked Archaean gneisses are overlain by supracrustal successions of the Palaeoproterozoic Karrat Group, defined by Henderson & Pulvertaft (1967) as comprising two formations: the Qeqertarssuaq Formation and the Nûkavsak Formation. The group was later extended to include the Mârmorilik Formation (Henderson & Pulvertaft 1987) originally considered to be of Archaean age (Henderson & Pulvertaft 1967) but later shown to be Palaeoproterozoic, resting with a depositional unconformity on Archaean gneiss (Garde 1978). Henderson & Pulvertaft (1987) suggested that the carbonatedominated Mârmorilik Formation in the south was laterally equivalent to the siliciclastic-dominated Qeqertarssuaq Formation in the north, the two subbasins being separated by a basement topographic high.