Abstract
The Puklen Intrusion is a small elongate complex situated in Nunarssuit, SW Greenland. It was emplaced in Ketilidian basement, and cut off and hornfelsed Gardar dolerites. The four component members of the intrusion are augite syenite, quartz syenite, soda granite and granophyre, emplaced in that order. It seems that these components represent a differentiation sequence from augite syenite. This is of interest owing to the widespread occurrence of augite syenite (with fayalite) in the Gardar province of SW. Greenland.
Highlights
During the summers of 1957 and 1958 the author mapped the large island of Nunarssuit, SW
As is clear from his diaries, Ussing climbed to the top of the highest point in this intrusion in order to tako bearings on the Nunarssuit mountains for his topographic map, he did not roalise that he had crossed from basement granite into ayounger intrusion
Over the remainder of the exposed margin of the Puklen intrusion quartz syenite is in contact with the country rocks
Summary
During the summers of 1957 and 1958 the author mapped the large island of Nunarssuit, SW. In the second of these summers, while working mostly in the basement granite rocks of east Nunarssuit, he discovered a small intrusion, incorporating syenite and soda granite, of which no previous record existed). In the second of these summers, while working mostly in the basement granite rocks of east Nunarssuit, he discovered a small intrusion, incorporating syenite and soda granite, of which no previous record existed1) This has been called the Puklen Intrusion, after the name given to a hill within it. As is clear from his diaries, Ussing climbed to the top of the highest point in this intrusion in order to tako bearings on the Nunarssuit mountains for his topographic map, he did not roalise that he had crossed from basement granite into ayounger intrusion His only geological observation from this traverse was that the summit of the hill was formod of »felsite«. Facilities for laboratory work were provided by the Mineralogical Museum in Copenhagen
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