Greenland: Nepheline-Cancrinite Syenite
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Fact sheet
Description: 

Gronnedal-Ika is a 8 km x 3 km nepheline syenite complex cut by a carbonatite plug. Aegirine–augite, alkali feldspar and nepheline are the major species found in the syenite, along with rare calcite. It was emplaced into the border zone between the Julianehab batholith (1850–1800 Ma), which is part of the Ketilidian mobile belt to the south and the Archean block to the north. The country rocks comprise quartzo-feldspathic gneisses, occasional amphibolites and rare calc-silicates. The complex has been dated at 1299±17Ma by Rb–Sr. The original structure of the complex comprises two series of layered syenites—the Lower Series and the Upper Series, which are separated by a raft of gneiss.

In Place
In Time
Location description: 
Gronnedal-Ika Complex, Ivigtut, Greenland
Accuracy:
Timescale:
Not known
Ma = Millions of years ago
In Focus
Collection:
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Type:
Type: 
igneous
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Rock-forming minerals:

Rock forming mineral:

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