| Reference Type | Journal (article/letter/editorial) |
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| Title | First occurrence of moskvinite-(Y) in the Ilímaussaq alkaline complex, South Greenland – implications for rare-earth element mobility |
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| Journal | Mineralogical Magazine |
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| Authors | Friis, Henrik | Author |
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| Year | 2016 (February) | Volume | 80 |
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| Page(s) | 31-41 | Issue | 1 |
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| Publisher | Mineralogical Society |
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| DOI | doi:10.1180/minmag.2016.080.047Search in ResearchGate |
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| Mindat Ref. ID | 244764 | Long-form Identifier | mindat:1:5:244764:7 |
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| GUID | a26e506d-a2c1-4a52-82c1-d2443c41481e |
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| Full Reference | Friis, Henrik (2016) First occurrence of moskvinite-(Y) in the Ilímaussaq alkaline complex, South Greenland – implications for rare-earth element mobility. Mineralogical Magazine, 80 (1) 31-41 doi:10.1180/minmag.2016.080.047 |
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| Plain Text | Friis, Henrik (2016) First occurrence of moskvinite-(Y) in the Ilímaussaq alkaline complex, South Greenland – implications for rare-earth element mobility. Mineralogical Magazine, 80 (1) 31-41 doi:10.1180/minmag.2016.080.047 |
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| Abstract/Notes | AbstractMoskvinite-(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. |
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