Parental magma of the Skaergaard intrusion: constraints from melt inclusions in primitive troctolite blocks and FG-1 dykes.
Abstract Troctolite blocks with compositions akin to the Hidden Zone are exposed in a tholeiitic dyke cutting across the Skaergaard intrusion, East Greenland. Plagioclase in these blocks contains finely crystallised melt inclusions that we have homogenised to constrain the parental magma to 47.4–49....
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ftuniaarhuspubl:oai:pure.atira.dk:publications/289ece69-3b90-4e25-8ddb-4af042551b25 2024-09-15T18:04:14+00:00 Parental magma of the Skaergaard intrusion: constraints from melt inclusions in primitive troctolite blocks and FG-1 dykes. Jakobsen, J.K. Tegner, Christian Brooks, Kent Kent, Adam Lesher, Charles Nielsen, Troels 2010 https://pure.au.dk/portal/en/publications/289ece69-3b90-4e25-8ddb-4af042551b25 eng eng https://pure.au.dk/portal/en/publications/289ece69-3b90-4e25-8ddb-4af042551b25 info:eu-repo/semantics/restrictedAccess Jakobsen , J K , Tegner , C , Brooks , K , Kent , A , Lesher , C & Nielsen , T 2010 , ' Parental magma of the Skaergaard intrusion: constraints from melt inclusions in primitive troctolite blocks and FG-1 dykes. ' , Contributions to Mineralogy and Petrology , vol. 159 , no. 1 , pp. 61-79 . article 2010 ftuniaarhuspubl 2024-06-25T14:14:21Z Abstract Troctolite blocks with compositions akin to the Hidden Zone are exposed in a tholeiitic dyke cutting across the Skaergaard intrusion, East Greenland. Plagioclase in these blocks contains finely crystallised melt inclusions that we have homogenised to constrain the parental magma to 47.4–49.0 wt.% SiO2, 13.4–14.9 wt.% Al2O3 and 10.7–14.1 wt.% FeOT. These compositions are lower in FeOT and higher in SiO2 than previous estimates and have distinct La/SmN and Dy/YbN ratios that link them to the lowermost volcanic succession (Milne Land Formation) of the regional East Greenland flood basalt province. New major- and trace element compositions for the FG-1 dyke swarm, previously taken to represent Skaergaard magmas, overlap with the entire range of the regional flood basalt succession and do not form a coherent suite of Skaergaard like melts. These dykes are therefore re-interpreted as feeder dykes throughout the main phase of flood basalt volcanism. Article in Journal/Newspaper East Greenland Greenland Milne Land Aarhus University: Research |
institution |
Open Polar |
collection |
Aarhus University: Research |
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ftuniaarhuspubl |
language |
English |
description |
Abstract Troctolite blocks with compositions akin to the Hidden Zone are exposed in a tholeiitic dyke cutting across the Skaergaard intrusion, East Greenland. Plagioclase in these blocks contains finely crystallised melt inclusions that we have homogenised to constrain the parental magma to 47.4–49.0 wt.% SiO2, 13.4–14.9 wt.% Al2O3 and 10.7–14.1 wt.% FeOT. These compositions are lower in FeOT and higher in SiO2 than previous estimates and have distinct La/SmN and Dy/YbN ratios that link them to the lowermost volcanic succession (Milne Land Formation) of the regional East Greenland flood basalt province. New major- and trace element compositions for the FG-1 dyke swarm, previously taken to represent Skaergaard magmas, overlap with the entire range of the regional flood basalt succession and do not form a coherent suite of Skaergaard like melts. These dykes are therefore re-interpreted as feeder dykes throughout the main phase of flood basalt volcanism. |
format |
Article in Journal/Newspaper |
author |
Jakobsen, J.K. Tegner, Christian Brooks, Kent Kent, Adam Lesher, Charles Nielsen, Troels |
spellingShingle |
Jakobsen, J.K. Tegner, Christian Brooks, Kent Kent, Adam Lesher, Charles Nielsen, Troels Parental magma of the Skaergaard intrusion: constraints from melt inclusions in primitive troctolite blocks and FG-1 dykes. |
author_facet |
Jakobsen, J.K. Tegner, Christian Brooks, Kent Kent, Adam Lesher, Charles Nielsen, Troels |
author_sort |
Jakobsen, J.K. |
title |
Parental magma of the Skaergaard intrusion: constraints from melt inclusions in primitive troctolite blocks and FG-1 dykes. |
title_short |
Parental magma of the Skaergaard intrusion: constraints from melt inclusions in primitive troctolite blocks and FG-1 dykes. |
title_full |
Parental magma of the Skaergaard intrusion: constraints from melt inclusions in primitive troctolite blocks and FG-1 dykes. |
title_fullStr |
Parental magma of the Skaergaard intrusion: constraints from melt inclusions in primitive troctolite blocks and FG-1 dykes. |
title_full_unstemmed |
Parental magma of the Skaergaard intrusion: constraints from melt inclusions in primitive troctolite blocks and FG-1 dykes. |
title_sort |
parental magma of the skaergaard intrusion: constraints from melt inclusions in primitive troctolite blocks and fg-1 dykes. |
publishDate |
2010 |
url |
https://pure.au.dk/portal/en/publications/289ece69-3b90-4e25-8ddb-4af042551b25 |
genre |
East Greenland Greenland Milne Land |
genre_facet |
East Greenland Greenland Milne Land |
op_source |
Jakobsen , J K , Tegner , C , Brooks , K , Kent , A , Lesher , C & Nielsen , T 2010 , ' Parental magma of the Skaergaard intrusion: constraints from melt inclusions in primitive troctolite blocks and FG-1 dykes. ' , Contributions to Mineralogy and Petrology , vol. 159 , no. 1 , pp. 61-79 . |
op_relation |
https://pure.au.dk/portal/en/publications/289ece69-3b90-4e25-8ddb-4af042551b25 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1810441736035500032 |