Characterization and paragenesis of nordite-group minerals from the Ilímaussaq alkaline complex, South Greenland
This thesis uses chemical and X-ray data to explore the composition and crystal-structure of nordite-group minerals from the two localities Igdlutalik Island and Taseq slope in Ilímaussaq Alkaline Complex in South Greenland. The nordite-group is a complex rare-earth silicate with the general formula...
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ftoslouniv:oai:www.duo.uio.no:10852/79599 2023-05-15T16:29:09+02:00 Characterization and paragenesis of nordite-group minerals from the Ilímaussaq alkaline complex, South Greenland Gulbransen, Emil Holtung 2020 http://hdl.handle.net/10852/79599 http://urn.nb.no/URN:NBN:no-82788 eng eng http://urn.nb.no/URN:NBN:no-82788 Gulbransen, Emil Holtung. Characterization and paragenesis of nordite-group minerals from the Ilímaussaq alkaline complex, South Greenland. Master thesis, University of Oslo, 2020 http://hdl.handle.net/10852/79599 URN:NBN:no-82788 Fulltext https://www.duo.uio.no/bitstream/handle/10852/79599/19/MSc-Thesis-Emil-Gulbransen.pdf Barium REE Igdlutalik nordite mineral Ilímaussaq Taseq Master thesis Masteroppgave 2020 ftoslouniv 2021-06-23T22:30:56Z This thesis uses chemical and X-ray data to explore the composition and crystal-structure of nordite-group minerals from the two localities Igdlutalik Island and Taseq slope in Ilímaussaq Alkaline Complex in South Greenland. The nordite-group is a complex rare-earth silicate with the general formula of A2BXYZT6O17 and consists of five approved species all of which have first been described from the alkaline complexes of the Kola Peninsula, Russia. From the Ilímaussaq Alkaline Complex, nordite-(Ce) has been described from a trachytic dyke on the island of Igdlutalik, and I suggest how nordite could have formed in this low alkaline system. The Igdlutalik nordite forms 20 µm - 100 µm euhedral crystals sparsely distributed in an aegirine and albite matrix. The mineral is homogeneous with the ideal formula of Na3SrCeZnSi6O17. The crystal structure was refinement in Pcca to R1 = 0.0158, with a unit cell of a = 14.3891(2), b = 5.1799(1), c = 19.7554(2) Å and V = 1472.44(3) Å3. At a new occurrence on the Taseq nordite is associated with ussingite, i.e. highly agpaitic conditions, as it is the case from most of the Kola occurrences. The Taseq nordite forms concentric circles growing from a chemical distinct Nd-rich core, forming clusters up to 5 mm in the ussingite matrix. The Taseq nordite is heterogeneous and displays sector zoning. The different zones are either Ba or Sr dominated, which has not previously been described in nordites. The ideal formula is Na3BaCeZnSi6O17. The crystal structure was refinement in Pcca to R1 = 0.0246, with a unit cell of a = 14.5596(4), b = 5.2213(1), c = 19.8270(4) and V = 1507.25(3) Å3. Overall, the X-site in the structure is dominated by Ba, which reflected in the chemical analysis. This means that the Taseq nordite is a new mineral to the world and the Ba-equivalent to nordite-(Ce) with the ideal formula of Na3BaCeZnSi6O17. Since the nordite-group already have a prefix and suffix determined by the Z-site and Y-site, respectively, a new root name is required. Illoq is the Greenlandic word for cousin and would describe the Ba-bearing nordites chemical relation to the other group members. Therefore, the new mineral from Taseq is suggested to be named illoqite-(Ce). Master Thesis Greenland greenlandic kola peninsula Universitet i Oslo: Digitale utgivelser ved UiO (DUO) Greenland Kola Peninsula Taseq ENVELOPE(-50.500,-50.500,63.083,63.083) |
institution |
Open Polar |
collection |
Universitet i Oslo: Digitale utgivelser ved UiO (DUO) |
op_collection_id |
ftoslouniv |
language |
English |
topic |
Barium REE Igdlutalik nordite mineral Ilímaussaq Taseq |
spellingShingle |
Barium REE Igdlutalik nordite mineral Ilímaussaq Taseq Gulbransen, Emil Holtung Characterization and paragenesis of nordite-group minerals from the Ilímaussaq alkaline complex, South Greenland |
topic_facet |
Barium REE Igdlutalik nordite mineral Ilímaussaq Taseq |
description |
This thesis uses chemical and X-ray data to explore the composition and crystal-structure of nordite-group minerals from the two localities Igdlutalik Island and Taseq slope in Ilímaussaq Alkaline Complex in South Greenland. The nordite-group is a complex rare-earth silicate with the general formula of A2BXYZT6O17 and consists of five approved species all of which have first been described from the alkaline complexes of the Kola Peninsula, Russia. From the Ilímaussaq Alkaline Complex, nordite-(Ce) has been described from a trachytic dyke on the island of Igdlutalik, and I suggest how nordite could have formed in this low alkaline system. The Igdlutalik nordite forms 20 µm - 100 µm euhedral crystals sparsely distributed in an aegirine and albite matrix. The mineral is homogeneous with the ideal formula of Na3SrCeZnSi6O17. The crystal structure was refinement in Pcca to R1 = 0.0158, with a unit cell of a = 14.3891(2), b = 5.1799(1), c = 19.7554(2) Å and V = 1472.44(3) Å3. At a new occurrence on the Taseq nordite is associated with ussingite, i.e. highly agpaitic conditions, as it is the case from most of the Kola occurrences. The Taseq nordite forms concentric circles growing from a chemical distinct Nd-rich core, forming clusters up to 5 mm in the ussingite matrix. The Taseq nordite is heterogeneous and displays sector zoning. The different zones are either Ba or Sr dominated, which has not previously been described in nordites. The ideal formula is Na3BaCeZnSi6O17. The crystal structure was refinement in Pcca to R1 = 0.0246, with a unit cell of a = 14.5596(4), b = 5.2213(1), c = 19.8270(4) and V = 1507.25(3) Å3. Overall, the X-site in the structure is dominated by Ba, which reflected in the chemical analysis. This means that the Taseq nordite is a new mineral to the world and the Ba-equivalent to nordite-(Ce) with the ideal formula of Na3BaCeZnSi6O17. Since the nordite-group already have a prefix and suffix determined by the Z-site and Y-site, respectively, a new root name is required. Illoq is the Greenlandic word for cousin and would describe the Ba-bearing nordites chemical relation to the other group members. Therefore, the new mineral from Taseq is suggested to be named illoqite-(Ce). |
format |
Master Thesis |
author |
Gulbransen, Emil Holtung |
author_facet |
Gulbransen, Emil Holtung |
author_sort |
Gulbransen, Emil Holtung |
title |
Characterization and paragenesis of nordite-group minerals from the Ilímaussaq alkaline complex, South Greenland |
title_short |
Characterization and paragenesis of nordite-group minerals from the Ilímaussaq alkaline complex, South Greenland |
title_full |
Characterization and paragenesis of nordite-group minerals from the Ilímaussaq alkaline complex, South Greenland |
title_fullStr |
Characterization and paragenesis of nordite-group minerals from the Ilímaussaq alkaline complex, South Greenland |
title_full_unstemmed |
Characterization and paragenesis of nordite-group minerals from the Ilímaussaq alkaline complex, South Greenland |
title_sort |
characterization and paragenesis of nordite-group minerals from the ilímaussaq alkaline complex, south greenland |
publishDate |
2020 |
url |
http://hdl.handle.net/10852/79599 http://urn.nb.no/URN:NBN:no-82788 |
long_lat |
ENVELOPE(-50.500,-50.500,63.083,63.083) |
geographic |
Greenland Kola Peninsula Taseq |
geographic_facet |
Greenland Kola Peninsula Taseq |
genre |
Greenland greenlandic kola peninsula |
genre_facet |
Greenland greenlandic kola peninsula |
op_relation |
http://urn.nb.no/URN:NBN:no-82788 Gulbransen, Emil Holtung. Characterization and paragenesis of nordite-group minerals from the Ilímaussaq alkaline complex, South Greenland. Master thesis, University of Oslo, 2020 http://hdl.handle.net/10852/79599 URN:NBN:no-82788 Fulltext https://www.duo.uio.no/bitstream/handle/10852/79599/19/MSc-Thesis-Emil-Gulbransen.pdf |
_version_ |
1766018832334323712 |