Geology of Greenland Survey Bulletin 190 - 2001

The Ilímaussaq alkaline complex, South Greenland: status of mineralogical research with new results

Edited by Henning Sørensen

The alkaline complex of Illímaussaq in the Mesoproterozoic Gardar Proince of South Greenland is the type locality for peralkaline, silica-undersaturated agpaitic nepheline syenites and represents an enormous concentration of a number of rare elements, particularly Li, Be, Nb, Zr, REE, Y, U and Th. This explains the presence of about 220 minerals, 27 first described from there, and nine unique to the complex.

Modern investigations of the complex started in the late 1950s, and since 1965 scientific papers on the complex published in various scientific journals have been consecutively numbered under the title 'Contributions to the mineralogy of Illímaussaq'. By 1981 this had reached no. 63 with a progress report on the geology, mineralogy, geochemistry and economic geology of the complex following ten years of intensive field activity.

This bulletin, no 100 in 'Contributions to the mineralogy of Illímaussaq', presents results from the continuing laboratory investigations of material collected during the earlier field work and drilling programmes, together with discussions and reviews of some selected topics in the light of new developments in the study of agpaitic nepheline syenites and their minerals.

Edited by Henning Sørensen

Contents

Colophon, contents, preface (pdf, 2.3 Mb)
Brief introduction to the geology of the Ilímaussaq alkaline complex, South Greenland, and its exploration history
H. Sørensen

 

List of all minerals identified in the Ilímaussaq alkaline complex, South Greenland (pdf, 0.3 Mb)
O.V. Petersen

 

Geochemical overview of the Ilímaussaq alkaline complex, South Greenland (pdf, 1.5 Mb)
J.C. Bailey, R. Gwozdz, J. Rose-Hansen and H. Sørensen

 

Distribution of germanium in rocks and minerals of the Ilímaussaq alkaline complex, South Greenland (pdf, 0.9 Mb)
J.C. Bailey

 

The eudialyte group: a review (pdf, 0.3 Mb)
O. Johnsen, J.D. Grice and R.A. Gault

 

The distribution of minerals in hyper-agpaitic rocks in terms of symmetry: evolution of views on the number and symmetry of minerals (pdf, 0.2 Mb)
A.P. Khomyakov

 

The hyper-agpaitic stage in the evolution of the Ilímaussaq alkaline complex, South Greenland (pdf, 0.7 Mb)
H. Sørensen and L.M. Larsen

 

Naujakasite from the Ilímaussaq alkaline complex, South Greenland, and the Lovozero alkaline complex, Kola Peninsula, Russia: a comparison (pdf, 0.7 Mb)
A.P. Khomyakov, H. Sørensen, O.V. Petersen and J.C. Bailey

 

Zoning in steenstrupine-(Ce) from the Ilímaussaq alkaline complex, South Greenland: a review and discussion (pdf, 0.7 Mb)
A.P. Khomyakov and H. Sørensen

 

Notes on leucophanite from the Ilímaussaq alkaline complex, South Greenland (pdf, 0.1 Mb)
H. Bohse, O.V. Petersen and G. Niedermayr

 

Notes on ephesite, terskite, Na-komarovite, ceriopyrochlore-(Ce), joaquinite-(Ce) and other minerals from the Ilímaussaq alkaline complex, South Greenland (pdf, 0.1 Mb)
E.I. Semenov

 

Thalcusite from Nakkaalaaq, the Ilímaussaq alkaline complex, South Greenland (pdf, 0.2 Mb)
S. Karup-Møller and E. Makovicky

 

Hiortdahlite II from the Ilímaussaq alkaline complex, South Greenland, the Tamazeght complex, Morocco, and the Iles de Los, Guinea (pdf, 0.3 Mb)
E.R. Robles, F. Fontan, P. Monchoux, H. Sørensen and P. de Parseval

 

Natrophosphate from the Ilímaussaq alkaline complex, South Greenland (pdf, 0.1 Mb)
O.V. Petersen, A.P. Khomyakov and H. Sørensen

 

Two new rare-earth-rich mineral associations in the Ilímaussaq alkaline complex, South Greenland (pdf, 0.1 Mb)
I.V. Pekov and I.A. Ekimenkova

 

Stability of Na–Be minerals in late-magmatic fluids of the Ilímaussaq alkaline complex, South Greenland (pdf, 0.9 Mb)
G. Markl

 

A review of the composition and evolution of hydrocarbon gases during solidification of the Ilímaussaq alkaline complex, South Greenland (pdf, 0.6 Mb)
J. Konnerup-Madsen

 

A note on the occurrence of gold in the Ilímaussaq alkaline complex, South Greenland (pdf, 0.1 Mb)
H. Bohse and J. Frederiksen

Bulletin № 190 cover

Igneous layering in kakortokites in the southern part of the Ilímaussaq alkaline complex, South Greenland. The central part of the photograph shows the uppermost part of the layered kakortokite series and the overlying transitional kakortokites and aegirine lujavrite on Laksefjeld (680 m), the dark mountain in the left middle ground of the photograph. The cliff facing the lake in the right middle ground shows the kakortokite layers + 4 to + 9. The kakortokite in the cliff on the opposite side of the lake is rich in xenoliths of roof rocks of augite syenite and naujaite making the layering less distinct. On the skyline is the mountain ridge Killavaat ('the comb'), the highest peak 1216 m, which is made up of Proterozoic granite which was baked and hardened at the contact to the intrusive complex. The lake (987 m) in the foreground is intensely blue and clear because it is practically devoid of life. The whole area is devoid of vegetation, with crumbly rocks typical of the nepheline syenites of the complex.

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