First occurrence of moskvinite-(Y) in the Ilímaussaq alkaline complex, South Greenland – implications for rare-earth element mobility
Moskvinite-(Y), Na2K(Y,REE)Si6O15, is a rare mineral, which until now has only been described from its type locality Dara-i-Pioz, Tajikistan. At Ilímaussaq moskvinite-(Y) was discovered in a drill core from Kvanefjeld, where it occurs as a replacement mineral associated with a mineral belonging to t...
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ftoslouniv:oai:www.duo.uio.no:10852/62869 2023-05-15T16:29:27+02:00 First occurrence of moskvinite-(Y) in the Ilímaussaq alkaline complex, South Greenland – implications for rare-earth element mobility Friis, Henrik 2016-03-17T20:37:55Z http://hdl.handle.net/10852/62869 http://urn.nb.no/URN:NBN:no-65438 https://doi.org/10.1180/minmag.2016.080.047 EN eng http://urn.nb.no/URN:NBN:no-65438 Friis, Henrik . First occurrence of moskvinite-(Y) in the Ilímaussaq alkaline complex, South Greenland – implications for rare-earth element mobility. Mineralogical magazine. 2016, 80(1), 31-41 http://hdl.handle.net/10852/62869 1345777 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Mineralogical magazine&rft.volume=80&rft.spage=31&rft.date=2016 Mineralogical magazine 80 1 31 41 http://dx.doi.org/10.1180/minmag.2016.080.047 URN:NBN:no-65438 Fulltext https://www.duo.uio.no/bitstream/handle/10852/62869/2/Moskvinite-%2528Y%2529_Friis%2B2016.pdf 0026-461X Journal article Tidsskriftartikkel Peer reviewed PublishedVersion 2016 ftoslouniv https://doi.org/10.1180/minmag.2016.080.047 2020-06-21T08:51:35Z Moskvinite-(Y), Na2K(Y,REE)Si6O15, is a rare mineral, which until now has only been described from its type locality Dara-i-Pioz, Tajikistan. At Ilímaussaq moskvinite-(Y) was discovered in a drill core from Kvanefjeld, where it occurs as a replacement mineral associated with a mineral belonging to the britholite group. The composition was determined by a combination of electron probe microanalysis and laser ablation inductively coupled plasma mass spectrometry analyses. The empirical formula based on 15 oxygens is Na1.94K0.99(Y0.94Yb0.03Er0.03 Dy0.03Ho0.01Gd0.01) ∑1.05Si5.98O15. The coexistence of an almost pure Y and a light rare-earth element (REE) mineral is interpreted as fractionation of REE and Y during the replacement of an earlier formed REE mineral. Theoretical calculations of the observed replacement of feldspathoids by natrolite show that the generated fluid would have pH > 8, which inhibits large scale mobility of REE. In addition, a K-Fe sulfide member of the chlorbartonite-bartonite group is for the first time observed in Ilímaussaq where it occurs where sodalite is replaced by natrolite and arfvedsonite by aegirine. The sulfide incorporates the S and some of the Cl generated by the alteration of sodalite, whereas the K and Fe originates from the replacement of arfvedsonite by aegirine. Article in Journal/Newspaper Greenland Universitet i Oslo: Digitale utgivelser ved UiO (DUO) Greenland Mineralogical Magazine 80 1 31 41 |
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Universitet i Oslo: Digitale utgivelser ved UiO (DUO) |
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English |
description |
Moskvinite-(Y), Na2K(Y,REE)Si6O15, is a rare mineral, which until now has only been described from its type locality Dara-i-Pioz, Tajikistan. At Ilímaussaq moskvinite-(Y) was discovered in a drill core from Kvanefjeld, where it occurs as a replacement mineral associated with a mineral belonging to the britholite group. The composition was determined by a combination of electron probe microanalysis and laser ablation inductively coupled plasma mass spectrometry analyses. The empirical formula based on 15 oxygens is Na1.94K0.99(Y0.94Yb0.03Er0.03 Dy0.03Ho0.01Gd0.01) ∑1.05Si5.98O15. The coexistence of an almost pure Y and a light rare-earth element (REE) mineral is interpreted as fractionation of REE and Y during the replacement of an earlier formed REE mineral. Theoretical calculations of the observed replacement of feldspathoids by natrolite show that the generated fluid would have pH > 8, which inhibits large scale mobility of REE. In addition, a K-Fe sulfide member of the chlorbartonite-bartonite group is for the first time observed in Ilímaussaq where it occurs where sodalite is replaced by natrolite and arfvedsonite by aegirine. The sulfide incorporates the S and some of the Cl generated by the alteration of sodalite, whereas the K and Fe originates from the replacement of arfvedsonite by aegirine. |
format |
Article in Journal/Newspaper |
author |
Friis, Henrik |
spellingShingle |
Friis, Henrik First occurrence of moskvinite-(Y) in the Ilímaussaq alkaline complex, South Greenland – implications for rare-earth element mobility |
author_facet |
Friis, Henrik |
author_sort |
Friis, Henrik |
title |
First occurrence of moskvinite-(Y) in the Ilímaussaq alkaline complex, South Greenland – implications for rare-earth element mobility |
title_short |
First occurrence of moskvinite-(Y) in the Ilímaussaq alkaline complex, South Greenland – implications for rare-earth element mobility |
title_full |
First occurrence of moskvinite-(Y) in the Ilímaussaq alkaline complex, South Greenland – implications for rare-earth element mobility |
title_fullStr |
First occurrence of moskvinite-(Y) in the Ilímaussaq alkaline complex, South Greenland – implications for rare-earth element mobility |
title_full_unstemmed |
First occurrence of moskvinite-(Y) in the Ilímaussaq alkaline complex, South Greenland – implications for rare-earth element mobility |
title_sort |
first occurrence of moskvinite-(y) in the ilímaussaq alkaline complex, south greenland – implications for rare-earth element mobility |
publishDate |
2016 |
url |
http://hdl.handle.net/10852/62869 http://urn.nb.no/URN:NBN:no-65438 https://doi.org/10.1180/minmag.2016.080.047 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
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Greenland |
op_source |
0026-461X |
op_relation |
http://urn.nb.no/URN:NBN:no-65438 Friis, Henrik . First occurrence of moskvinite-(Y) in the Ilímaussaq alkaline complex, South Greenland – implications for rare-earth element mobility. Mineralogical magazine. 2016, 80(1), 31-41 http://hdl.handle.net/10852/62869 1345777 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Mineralogical magazine&rft.volume=80&rft.spage=31&rft.date=2016 Mineralogical magazine 80 1 31 41 http://dx.doi.org/10.1180/minmag.2016.080.047 URN:NBN:no-65438 Fulltext https://www.duo.uio.no/bitstream/handle/10852/62869/2/Moskvinite-%2528Y%2529_Friis%2B2016.pdf |
op_doi |
https://doi.org/10.1180/minmag.2016.080.047 |
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Mineralogical Magazine |
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80 |
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1 |
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31 |
op_container_end_page |
41 |
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1766019158249570304 |