Syenitic and associated intrusions of the Kap Edvard Holm region of Kangerdlugssuaq, East Greenland
Kap Edvard Holm, near Kangerdlugssuaq, forms part of one of the six Tertiary igneous centres of southern East Greenland. The plutonic rocks are mainly cumulate gabbros but there are several syenite masses, together with some minor granophyres and other acid rocks. The larger syenites - Kap Boswell,...
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The Commission for Scientific Research in Greenland /Danish Polar Center
1984
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ftkbcopenhojs:oai:ojs.tidsskrift.dk:article/139673 2024-01-28T10:05:28+01:00 Syenitic and associated intrusions of the Kap Edvard Holm region of Kangerdlugssuaq, East Greenland Deer, W. A. Kempe, D. R. C. Jones, G. C. 1984-10-05 application/pdf https://tidsskrift.dk/meddrgroenland_geosci/article/view/139673 eng eng The Commission for Scientific Research in Greenland /Danish Polar Center https://tidsskrift.dk/meddrgroenland_geosci/article/view/139673/184196 https://tidsskrift.dk/meddrgroenland_geosci/article/view/139673 Meddelelser om Grønland. Geoscience; Vol. 12 (1984): Meddelelser om Grønland. Geoscience; 26 pp. Meddelelser om Grønland. Geoscience; Årg. 12 (1984): Meddelelser om Grønland, Geoscience; 26 pp. 1600-4590 0106-1046 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1984 ftkbcopenhojs 2024-01-03T23:58:29Z Kap Edvard Holm, near Kangerdlugssuaq, forms part of one of the six Tertiary igneous centres of southern East Greenland. The plutonic rocks are mainly cumulate gabbros but there are several syenite masses, together with some minor granophyres and other acid rocks. The larger syenites - Kap Boswell, Kap Deichmann, and Hutchinson Gletscher I - are intruded as conical masses into the gabbros with an intermediate ring of igneous breccia. The petrography, mineralogy, and bulk chemistry of the rocks are reported. The syenites are generally nordmarkitic, containing hedenbergite and aegirine-augite, and amphiboles ranging from hastingsite, ferroedenite, and ferrorichterite (katophorite) to arfvedsonite, while aenigmatite is quite common in the Kap Boswell and Barberkniven syenites and veins. Many rock and mineral analyses are given. An estimate of the composition of the parent magma gives a nordmarkitic liquid very close to that of the main peripheral intrusions at Kangerdlugssuaq and also to the quartz trachytic late differentiate of the Azores alkali basalt. This agrees with the authors' earlier suggestion that all the syenite masses were most probably the products of a quartz trachyte magma, fractionated in the case of the main intrusion to yield the range of rock types occurring there, and itself produced by differentiation of an alkali basalt magma such as yielded some of the many dykes present in the region. An alternative explanation, proposed by Brooks & Gill (1982), that the main intrusion derived from the reaction of a foyaitic magma, fractionated from a nephelinitic parent, with the enclosing gneisses and basalts, could not have been repeated so exactly throughout the minor peripheral intrusions at Kangerdlugssuaq and again at Kap Edvard Holm. Article in Journal/Newspaper East Greenland Greenland Kap Edvard Holm Tidsskrift.dk (The Royal Library, Denmark) Greenland Hutchinson Gletscher ENVELOPE(-32.917,-32.917,68.117,68.117) Kap ENVELOPE(23.567,23.567,65.533,65.533) Kap Deichmann ENVELOPE(-32.050,-32.050,68.050,68.050) |
institution |
Open Polar |
collection |
Tidsskrift.dk (The Royal Library, Denmark) |
op_collection_id |
ftkbcopenhojs |
language |
English |
description |
Kap Edvard Holm, near Kangerdlugssuaq, forms part of one of the six Tertiary igneous centres of southern East Greenland. The plutonic rocks are mainly cumulate gabbros but there are several syenite masses, together with some minor granophyres and other acid rocks. The larger syenites - Kap Boswell, Kap Deichmann, and Hutchinson Gletscher I - are intruded as conical masses into the gabbros with an intermediate ring of igneous breccia. The petrography, mineralogy, and bulk chemistry of the rocks are reported. The syenites are generally nordmarkitic, containing hedenbergite and aegirine-augite, and amphiboles ranging from hastingsite, ferroedenite, and ferrorichterite (katophorite) to arfvedsonite, while aenigmatite is quite common in the Kap Boswell and Barberkniven syenites and veins. Many rock and mineral analyses are given. An estimate of the composition of the parent magma gives a nordmarkitic liquid very close to that of the main peripheral intrusions at Kangerdlugssuaq and also to the quartz trachytic late differentiate of the Azores alkali basalt. This agrees with the authors' earlier suggestion that all the syenite masses were most probably the products of a quartz trachyte magma, fractionated in the case of the main intrusion to yield the range of rock types occurring there, and itself produced by differentiation of an alkali basalt magma such as yielded some of the many dykes present in the region. An alternative explanation, proposed by Brooks & Gill (1982), that the main intrusion derived from the reaction of a foyaitic magma, fractionated from a nephelinitic parent, with the enclosing gneisses and basalts, could not have been repeated so exactly throughout the minor peripheral intrusions at Kangerdlugssuaq and again at Kap Edvard Holm. |
format |
Article in Journal/Newspaper |
author |
Deer, W. A. Kempe, D. R. C. Jones, G. C. |
spellingShingle |
Deer, W. A. Kempe, D. R. C. Jones, G. C. Syenitic and associated intrusions of the Kap Edvard Holm region of Kangerdlugssuaq, East Greenland |
author_facet |
Deer, W. A. Kempe, D. R. C. Jones, G. C. |
author_sort |
Deer, W. A. |
title |
Syenitic and associated intrusions of the Kap Edvard Holm region of Kangerdlugssuaq, East Greenland |
title_short |
Syenitic and associated intrusions of the Kap Edvard Holm region of Kangerdlugssuaq, East Greenland |
title_full |
Syenitic and associated intrusions of the Kap Edvard Holm region of Kangerdlugssuaq, East Greenland |
title_fullStr |
Syenitic and associated intrusions of the Kap Edvard Holm region of Kangerdlugssuaq, East Greenland |
title_full_unstemmed |
Syenitic and associated intrusions of the Kap Edvard Holm region of Kangerdlugssuaq, East Greenland |
title_sort |
syenitic and associated intrusions of the kap edvard holm region of kangerdlugssuaq, east greenland |
publisher |
The Commission for Scientific Research in Greenland /Danish Polar Center |
publishDate |
1984 |
url |
https://tidsskrift.dk/meddrgroenland_geosci/article/view/139673 |
long_lat |
ENVELOPE(-32.917,-32.917,68.117,68.117) ENVELOPE(23.567,23.567,65.533,65.533) ENVELOPE(-32.050,-32.050,68.050,68.050) |
geographic |
Greenland Hutchinson Gletscher Kap Kap Deichmann |
geographic_facet |
Greenland Hutchinson Gletscher Kap Kap Deichmann |
genre |
East Greenland Greenland Kap Edvard Holm |
genre_facet |
East Greenland Greenland Kap Edvard Holm |
op_source |
Meddelelser om Grønland. Geoscience; Vol. 12 (1984): Meddelelser om Grønland. Geoscience; 26 pp. Meddelelser om Grønland. Geoscience; Årg. 12 (1984): Meddelelser om Grønland, Geoscience; 26 pp. 1600-4590 0106-1046 |
op_relation |
https://tidsskrift.dk/meddrgroenland_geosci/article/view/139673/184196 https://tidsskrift.dk/meddrgroenland_geosci/article/view/139673 |
_version_ |
1789331758301315072 |