Mineralogy of the Werner Bjerge alkaline complex, East Greenland
The Tertiary Werner Bjerge complex is divided into a basic complex, a northern complex and a nepheline syenite complex. The basic complex consists of cumulate rocks (ranging from ultramafic to gabbros) containing plagioclase, clinopyroxene, olivine and titanomagnetite with intercumulus kaersutite or...
Published in: | Meddelelser om Grønland. Geoscience |
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Format: | Article in Journal/Newspaper |
Language: | English |
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The Commission for Scientific Research in Greenland /Danish Polar Center
1982
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Online Access: | https://tidsskrift.dk/meddrgroenland_geosci/article/view/138961 |
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ftsbaarhusojs:oai:ojs.tidsskrift.dk:article/138961 2024-01-28T10:05:29+01:00 Mineralogy of the Werner Bjerge alkaline complex, East Greenland Brooks, C. Kent Engell, John Larsen, Lotte Melchior Pedersen, Asger Ken 1982-06-28 application/pdf https://tidsskrift.dk/meddrgroenland_geosci/article/view/138961 eng eng The Commission for Scientific Research in Greenland /Danish Polar Center https://tidsskrift.dk/meddrgroenland_geosci/article/view/138961/184921 https://tidsskrift.dk/meddrgroenland_geosci/article/view/138961 Meddelelser om Grønland. Geoscience; Vol. 7 (1982): Meddelelser om Grønland. Geoscience; 35 pp. Meddelelser om Grønland. Geoscience; Årg. 7 (1982): Meddelelser om Grønland, Geoscience; 35 pp. 1600-4590 0106-1046 10.7146/moggeosci.v7i info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1982 ftsbaarhusojs https://doi.org/10.7146/moggeosci.v7i 2024-01-03T23:59:20Z The Tertiary Werner Bjerge complex is divided into a basic complex, a northern complex and a nepheline syenite complex. The basic complex consists of cumulate rocks (ranging from ultramafic to gabbros) containing plagioclase, clinopyroxene, olivine and titanomagnetite with intercumulus kaersutite or biotite and subsolidus amphiboles and sheet silicates. Similar cumulates but containing cumulus kaersutite occur as inclusions in dykes associated with the nearby Theresabjerg intrusion and have been included in the study. The northern complex includes a wide range of felsic rock types of which two granites have been examined. In the nepheline syenite complex the rock types investigated include foyaites, a tinguaite, and quartz-bearing pegmatite. The main minerals in these rocks are alkali feldspar, nepheline, sodalite, alkali pyroxene, alkali amphibole and biotite together with a wide range of minor and accessory phases. Clinopyroxenes vary from diopsides and salites in the basic rocks to aegirine-augites and acmites in the more evolved types, which are unusually MnO-rich. Titan-aegirines occur in the pegmatite. The amphibole in the basic rocks is kaersutite; in the granite it is manganoan richterite, and in the nepheline syenite complex the amphiboles vary from hastingsitic hornblende through katophorite to manganoan arfvedsonite. The pegmatite contains unique Li-arfvedsonites. Minor late-stage calcic amphiboles occur in the basic rocks. Sheet silicates include micas and secondary mixed layer types, chlorite and talc. Primary micas of the basic complex are titaniferous biotites and in the nepheline syenites are Mn-rich biotites, while the pegmatite contains the rare Li-mica, taeniolite. Feldspars range from bytownite in the basic rocks to mainly alkali feldspar in the nepheline syenites which is often optically homogeneous and strongly potassic. Analyses of feldspathoids and zeolites are also presented. The oxides of the evolved rocks are also MnO-rich and pyrophanite has been encountered in both the granite and ... Article in Journal/Newspaper East Greenland Greenland Aarhus University: OJS at The State and University Library Greenland Titan ENVELOPE(33.629,33.629,67.560,67.560) Meddelelser om Grønland. Geoscience 7 |
institution |
Open Polar |
collection |
Aarhus University: OJS at The State and University Library |
op_collection_id |
ftsbaarhusojs |
language |
English |
description |
The Tertiary Werner Bjerge complex is divided into a basic complex, a northern complex and a nepheline syenite complex. The basic complex consists of cumulate rocks (ranging from ultramafic to gabbros) containing plagioclase, clinopyroxene, olivine and titanomagnetite with intercumulus kaersutite or biotite and subsolidus amphiboles and sheet silicates. Similar cumulates but containing cumulus kaersutite occur as inclusions in dykes associated with the nearby Theresabjerg intrusion and have been included in the study. The northern complex includes a wide range of felsic rock types of which two granites have been examined. In the nepheline syenite complex the rock types investigated include foyaites, a tinguaite, and quartz-bearing pegmatite. The main minerals in these rocks are alkali feldspar, nepheline, sodalite, alkali pyroxene, alkali amphibole and biotite together with a wide range of minor and accessory phases. Clinopyroxenes vary from diopsides and salites in the basic rocks to aegirine-augites and acmites in the more evolved types, which are unusually MnO-rich. Titan-aegirines occur in the pegmatite. The amphibole in the basic rocks is kaersutite; in the granite it is manganoan richterite, and in the nepheline syenite complex the amphiboles vary from hastingsitic hornblende through katophorite to manganoan arfvedsonite. The pegmatite contains unique Li-arfvedsonites. Minor late-stage calcic amphiboles occur in the basic rocks. Sheet silicates include micas and secondary mixed layer types, chlorite and talc. Primary micas of the basic complex are titaniferous biotites and in the nepheline syenites are Mn-rich biotites, while the pegmatite contains the rare Li-mica, taeniolite. Feldspars range from bytownite in the basic rocks to mainly alkali feldspar in the nepheline syenites which is often optically homogeneous and strongly potassic. Analyses of feldspathoids and zeolites are also presented. The oxides of the evolved rocks are also MnO-rich and pyrophanite has been encountered in both the granite and ... |
format |
Article in Journal/Newspaper |
author |
Brooks, C. Kent Engell, John Larsen, Lotte Melchior Pedersen, Asger Ken |
spellingShingle |
Brooks, C. Kent Engell, John Larsen, Lotte Melchior Pedersen, Asger Ken Mineralogy of the Werner Bjerge alkaline complex, East Greenland |
author_facet |
Brooks, C. Kent Engell, John Larsen, Lotte Melchior Pedersen, Asger Ken |
author_sort |
Brooks, C. Kent |
title |
Mineralogy of the Werner Bjerge alkaline complex, East Greenland |
title_short |
Mineralogy of the Werner Bjerge alkaline complex, East Greenland |
title_full |
Mineralogy of the Werner Bjerge alkaline complex, East Greenland |
title_fullStr |
Mineralogy of the Werner Bjerge alkaline complex, East Greenland |
title_full_unstemmed |
Mineralogy of the Werner Bjerge alkaline complex, East Greenland |
title_sort |
mineralogy of the werner bjerge alkaline complex, east greenland |
publisher |
The Commission for Scientific Research in Greenland /Danish Polar Center |
publishDate |
1982 |
url |
https://tidsskrift.dk/meddrgroenland_geosci/article/view/138961 |
long_lat |
ENVELOPE(33.629,33.629,67.560,67.560) |
geographic |
Greenland Titan |
geographic_facet |
Greenland Titan |
genre |
East Greenland Greenland |
genre_facet |
East Greenland Greenland |
op_source |
Meddelelser om Grønland. Geoscience; Vol. 7 (1982): Meddelelser om Grønland. Geoscience; 35 pp. Meddelelser om Grønland. Geoscience; Årg. 7 (1982): Meddelelser om Grønland, Geoscience; 35 pp. 1600-4590 0106-1046 10.7146/moggeosci.v7i |
op_relation |
https://tidsskrift.dk/meddrgroenland_geosci/article/view/138961/184921 https://tidsskrift.dk/meddrgroenland_geosci/article/view/138961 |
op_doi |
https://doi.org/10.7146/moggeosci.v7i |
container_title |
Meddelelser om Grønland. Geoscience |
container_volume |
7 |
_version_ |
1789331791761375232 |