Kimberlite and lamproite dykes from Holsteinsborg, West Greenland
Numerous kimberlite and lamproite dykes occur to the south and east of Holsteinsborg in Central West Greenland. This paper gives details of the petrography, mineral chemistry, age relations and geochemistry of the dykes. The kimberlites are composed of macrocysts of olivine, phlogopite, rare ilmenit...
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The Commission for Scientific Research in Greenland /Danish Polar Center
1981
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ftsbaarhusojs:oai:ojs.tidsskrift.dk:article/138936 2024-01-28T10:06:06+01:00 Kimberlite and lamproite dykes from Holsteinsborg, West Greenland Scott, Barbara H. 1981-12-31 application/pdf https://tidsskrift.dk/meddrgroenland_geosci/article/view/138936 eng eng The Commission for Scientific Research in Greenland /Danish Polar Center https://tidsskrift.dk/meddrgroenland_geosci/article/view/138936/184916 https://tidsskrift.dk/meddrgroenland_geosci/article/view/138936 Meddelelser om Grønland. Geoscience; Vol. 4 (1981): Meddelelser om Grønland. Geoscience; 24 pp. Meddelelser om Grønland. Geoscience; Årg. 4 (1981); 24 pp. 1600-4590 0106-1046 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1981 ftsbaarhusojs 2024-01-03T23:59:16Z Numerous kimberlite and lamproite dykes occur to the south and east of Holsteinsborg in Central West Greenland. This paper gives details of the petrography, mineral chemistry, age relations and geochemistry of the dykes. The kimberlites are composed of macrocysts of olivine, phlogopite, rare ilmenite and garnet in a matrix of olivine, phlogopite, diopside, perovskite, spinel, serpentine, carbonate and apatite. They can mostly be classified as clinopyroxene-phlogopite hypabyssal kimberlites. Mantle-derived inclusions are found in some of the dykes and include lherzolites, wehrlites, harzburgites and, most commonly, dunites. Both coarse and porphyroclastic inclusions occur. Garnet-granulites and eclogites, although rare, are present. The lamproites have variable mineral assemblages and textures but the main constituents are phenocrysts of pseudoleucite, olivine, phlogopite and clinopyroxene set in a groundmass of phlogopite, potassic richterite, diopside, pseudoleucite and potassium feldspar. The mineralogy of these dykes is a reflection of unusual ultrapotassic, magnesian whole-rock compositions. Numerous kimberlite and lamproite dykes occur to the south and east of Holsteinsborg in Central West Greenland. This paper gives details of the petrography, mineral chemistry, age relations and geochemistry of the dykes. The kimberlites are composed of macrocysts of olivine, phlogopite, rare ilmenite and garnet in a matrix of olivine, phlogopite, diopside, perovskite, spine!, serpentine, carbonate and apatite. They can mostly be classified as clinopyroxene-phlogopite hypabyssal kimberlites. Mantle-derived inclusions are found in some of the dykes and include lherzolites, wehrlites, harzburgites and, most commonly, dunites. Both coarse and porphyroclastic inclusions occur. Garnet-granulites and eclogites, although rare, are present. The lamproites have variable mineral assemblages and textures but the main constituents are phenocrysts of pseudoleucite, olivine, phlogopite and clinopyroxene set in a groundmass of ... Article in Journal/Newspaper Greenland Aarhus University: OJS at The State and University Library Greenland |
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Open Polar |
collection |
Aarhus University: OJS at The State and University Library |
op_collection_id |
ftsbaarhusojs |
language |
English |
description |
Numerous kimberlite and lamproite dykes occur to the south and east of Holsteinsborg in Central West Greenland. This paper gives details of the petrography, mineral chemistry, age relations and geochemistry of the dykes. The kimberlites are composed of macrocysts of olivine, phlogopite, rare ilmenite and garnet in a matrix of olivine, phlogopite, diopside, perovskite, spinel, serpentine, carbonate and apatite. They can mostly be classified as clinopyroxene-phlogopite hypabyssal kimberlites. Mantle-derived inclusions are found in some of the dykes and include lherzolites, wehrlites, harzburgites and, most commonly, dunites. Both coarse and porphyroclastic inclusions occur. Garnet-granulites and eclogites, although rare, are present. The lamproites have variable mineral assemblages and textures but the main constituents are phenocrysts of pseudoleucite, olivine, phlogopite and clinopyroxene set in a groundmass of phlogopite, potassic richterite, diopside, pseudoleucite and potassium feldspar. The mineralogy of these dykes is a reflection of unusual ultrapotassic, magnesian whole-rock compositions. Numerous kimberlite and lamproite dykes occur to the south and east of Holsteinsborg in Central West Greenland. This paper gives details of the petrography, mineral chemistry, age relations and geochemistry of the dykes. The kimberlites are composed of macrocysts of olivine, phlogopite, rare ilmenite and garnet in a matrix of olivine, phlogopite, diopside, perovskite, spine!, serpentine, carbonate and apatite. They can mostly be classified as clinopyroxene-phlogopite hypabyssal kimberlites. Mantle-derived inclusions are found in some of the dykes and include lherzolites, wehrlites, harzburgites and, most commonly, dunites. Both coarse and porphyroclastic inclusions occur. Garnet-granulites and eclogites, although rare, are present. The lamproites have variable mineral assemblages and textures but the main constituents are phenocrysts of pseudoleucite, olivine, phlogopite and clinopyroxene set in a groundmass of ... |
format |
Article in Journal/Newspaper |
author |
Scott, Barbara H. |
spellingShingle |
Scott, Barbara H. Kimberlite and lamproite dykes from Holsteinsborg, West Greenland |
author_facet |
Scott, Barbara H. |
author_sort |
Scott, Barbara H. |
title |
Kimberlite and lamproite dykes from Holsteinsborg, West Greenland |
title_short |
Kimberlite and lamproite dykes from Holsteinsborg, West Greenland |
title_full |
Kimberlite and lamproite dykes from Holsteinsborg, West Greenland |
title_fullStr |
Kimberlite and lamproite dykes from Holsteinsborg, West Greenland |
title_full_unstemmed |
Kimberlite and lamproite dykes from Holsteinsborg, West Greenland |
title_sort |
kimberlite and lamproite dykes from holsteinsborg, west greenland |
publisher |
The Commission for Scientific Research in Greenland /Danish Polar Center |
publishDate |
1981 |
url |
https://tidsskrift.dk/meddrgroenland_geosci/article/view/138936 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Meddelelser om Grønland. Geoscience; Vol. 4 (1981): Meddelelser om Grønland. Geoscience; 24 pp. Meddelelser om Grønland. Geoscience; Årg. 4 (1981); 24 pp. 1600-4590 0106-1046 |
op_relation |
https://tidsskrift.dk/meddrgroenland_geosci/article/view/138936/184916 https://tidsskrift.dk/meddrgroenland_geosci/article/view/138936 |
_version_ |
1789332766674911232 |