Abstract
A detailed 1 :500 map and a description of some peculiar breccia structures are presented. The breccia was emplaced in the Precambrian basement rocks, consisting mainly of granodioritic gneisses and amphibolites. The structures of the breccia are highly irregular consisting of lots of connected dyke-shaped bodies. More distinct dykes of the breccia matrix run out into the gneisses. The breccia itself consists of a matrix of mineral fragments and numerous inclusions of rock fragments, the majority of which are of exotic origin. Associated with the breccia are some larger soapstone bodies of which smaller fragments are found in the breccia. The breccia is thought to have been emplaced by gas drilling in connection with the intrusion of the soapstones in a solid/subsolid stage. The chronological significance of the breccia is emphasized.
Highlights
During mapping work for the Geological Survey of Greenland (Grønlands Geologiske Undersøgelse, G.G.U.) in the Ivigtut area some peculiar breccia structures of intrusive character and with associated ultrabasic rocks were found on the island Sermersut
These breccias turned out to be af chronological significance for the Precambrian basement of southwest Greenland
The author decided after a short reconnaissance to make a detailed map of a relatively well-exposed area on the south coast of the small inlet an the south side of the island Sermersut
Summary
During mapping work for the Geological Survey of Greenland (Grønlands Geologiske Undersøgelse, G.G.U.) in the Ivigtut area some peculiar breccia structures of intrusive character and with associated ultrabasic rocks were found on the island Sermersut (ca. 45 km westnorth-west af the cryolite mine at Ivigtut). During mapping work for the Geological Survey of Greenland (Grønlands Geologiske Undersøgelse, G.G.U.) in the Ivigtut area some peculiar breccia structures of intrusive character and with associated ultrabasic rocks were found on the island Sermersut The breccia was emplaced in gneiss and amphibolites within the area mapped the country rocks are mainly gneisses.
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