The Ilímaussaq alkaline complex, South Greenland - an overview of 200 years of research and an outlook
The Ilímaussaq alkaline complex, South Greenland, the type locality of agpaitic nepheline syenites and of thirty minerals, among which arfvedsonite, eudialyte and sodalite, has been studied since 1806. The paper reviews the outcome of 200 years of geological investigations and presents an overview a...
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2006
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ftkbcopenhojs:oai:ojs.tidsskrift.dk:article/140294 2023-12-24T10:17:11+01:00 The Ilímaussaq alkaline complex, South Greenland - an overview of 200 years of research and an outlook Sørensen, Henning 2006-01-01 application/pdf https://tidsskrift.dk/meddrgroenland_geosci/article/view/140294 eng eng The Commission for Scientific Research in Greenland /Danish Polar Center https://tidsskrift.dk/meddrgroenland_geosci/article/view/140294/185010 https://tidsskrift.dk/meddrgroenland_geosci/article/view/140294 Meddelelser om Grønland. Geoscience; Vol. 45 (2006): Meddelelser om Grønland. Geoscience: The Ilímaussaq alkaline complex, South Greenland - an overview of 200 years of research and an outlook; 70 pp., 6 tables Meddelelser om Grønland. Geoscience; Årg. 45 (2006): Meddelelser om Grønland, Geoscience; 70 pp., 6 tables 1600-4590 0106-1046 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2006 ftkbcopenhojs 2023-11-29T23:58:53Z The Ilímaussaq alkaline complex, South Greenland, the type locality of agpaitic nepheline syenites and of thirty minerals, among which arfvedsonite, eudialyte and sodalite, has been studied since 1806. The paper reviews the outcome of 200 years of geological investigations and presents an overview and a synthesis of the petrology of the complex. The site of the complex was invaded successively by augite syenitic, alkali granitic and nepheline syenitic melts. Remnants of the augite syenite and granite intrusions are found along the contacts of the nepheline syenites and as xenoliths in these. The nepheline syenites, which occupy the major part of the complex, are divided into a roof series, an intermediate series and a floor series. The roof series crystallized from the roof downward in the order pulaskite, foyaite, and the agpaitic rocks sodalitefoyaite and naujaite. The floor series consists of cumulates: an inferred hidden part formed simultaneously with the roof series and an exposed part of layered agpaitic nepheline syenites (kakortokites) which were formed at least partly later than the roof series. The floor series passes gradually into the overlying intermediate series consisting of the agpaitic rock type called lujavrites. The lujavrites enclose rafts of naujaite and appear to have been emplaced by piecemeal stoping. The larger lujavrite masses are floor cumulates, but lujavrite dykes and sheets occupy fractures in the roof seriesrocks. According to one model for the evolution of the complex, the nepheline syeniteformed by consolidation of one magma batch in a closed system. The lujavrites were formed from the residual melts left after the formation of the roof series and the floor series and were sandwiched between these. A second model implies that the kakortokites and lujavrites formed from one or more separate magma pulses which intruded the already consolidated roof series rocks. This model is supported by new information on contact relations and especially on the petrology and geochemistry of a ... Article in Journal/Newspaper Greenland Tidsskrift.dk (The Royal Library, Denmark) Greenland |
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Tidsskrift.dk (The Royal Library, Denmark) |
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language |
English |
description |
The Ilímaussaq alkaline complex, South Greenland, the type locality of agpaitic nepheline syenites and of thirty minerals, among which arfvedsonite, eudialyte and sodalite, has been studied since 1806. The paper reviews the outcome of 200 years of geological investigations and presents an overview and a synthesis of the petrology of the complex. The site of the complex was invaded successively by augite syenitic, alkali granitic and nepheline syenitic melts. Remnants of the augite syenite and granite intrusions are found along the contacts of the nepheline syenites and as xenoliths in these. The nepheline syenites, which occupy the major part of the complex, are divided into a roof series, an intermediate series and a floor series. The roof series crystallized from the roof downward in the order pulaskite, foyaite, and the agpaitic rocks sodalitefoyaite and naujaite. The floor series consists of cumulates: an inferred hidden part formed simultaneously with the roof series and an exposed part of layered agpaitic nepheline syenites (kakortokites) which were formed at least partly later than the roof series. The floor series passes gradually into the overlying intermediate series consisting of the agpaitic rock type called lujavrites. The lujavrites enclose rafts of naujaite and appear to have been emplaced by piecemeal stoping. The larger lujavrite masses are floor cumulates, but lujavrite dykes and sheets occupy fractures in the roof seriesrocks. According to one model for the evolution of the complex, the nepheline syeniteformed by consolidation of one magma batch in a closed system. The lujavrites were formed from the residual melts left after the formation of the roof series and the floor series and were sandwiched between these. A second model implies that the kakortokites and lujavrites formed from one or more separate magma pulses which intruded the already consolidated roof series rocks. This model is supported by new information on contact relations and especially on the petrology and geochemistry of a ... |
format |
Article in Journal/Newspaper |
author |
Sørensen, Henning |
spellingShingle |
Sørensen, Henning The Ilímaussaq alkaline complex, South Greenland - an overview of 200 years of research and an outlook |
author_facet |
Sørensen, Henning |
author_sort |
Sørensen, Henning |
title |
The Ilímaussaq alkaline complex, South Greenland - an overview of 200 years of research and an outlook |
title_short |
The Ilímaussaq alkaline complex, South Greenland - an overview of 200 years of research and an outlook |
title_full |
The Ilímaussaq alkaline complex, South Greenland - an overview of 200 years of research and an outlook |
title_fullStr |
The Ilímaussaq alkaline complex, South Greenland - an overview of 200 years of research and an outlook |
title_full_unstemmed |
The Ilímaussaq alkaline complex, South Greenland - an overview of 200 years of research and an outlook |
title_sort |
ilímaussaq alkaline complex, south greenland - an overview of 200 years of research and an outlook |
publisher |
The Commission for Scientific Research in Greenland /Danish Polar Center |
publishDate |
2006 |
url |
https://tidsskrift.dk/meddrgroenland_geosci/article/view/140294 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Meddelelser om Grønland. Geoscience; Vol. 45 (2006): Meddelelser om Grønland. Geoscience: The Ilímaussaq alkaline complex, South Greenland - an overview of 200 years of research and an outlook; 70 pp., 6 tables Meddelelser om Grønland. Geoscience; Årg. 45 (2006): Meddelelser om Grønland, Geoscience; 70 pp., 6 tables 1600-4590 0106-1046 |
op_relation |
https://tidsskrift.dk/meddrgroenland_geosci/article/view/140294/185010 https://tidsskrift.dk/meddrgroenland_geosci/article/view/140294 |
_version_ |
1786205126609862656 |