Markl, Gregor (2001) Stability of Na–Be minerals in late-magmatic fluids of the Ilímaussaq alkaline complex, South Greenland. Geology of Greenland Survey Bulletin, 190 (190) 145-158 doi:10.34194/ggub.v190.5186
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Stability of Na–Be minerals in late-magmatic fluids of the Ilímaussaq alkaline complex, South Greenland | ||
| Journal | Geology of Greenland Survey Bulletin | ||
| Authors | Markl, Gregor | Author | |
| Year | 2001 (December 21) | Volume | 190 |
| Issue | 190 | ||
| Publisher | Geological Survey of Denmark and Greenland | ||
| URL | |||
| Download URL | https://geusjournals.org/index.php/ggub/issue/download/427/38+ | ||
| DOI | doi:10.34194/ggub.v190.5186Search in ResearchGate | ||
| Generate Citation Formats | |||
| Classification | Not set | LoC | Not set |
| Mindat Ref. ID | 16914118 | Long-form Identifier | mindat:1:5:16914118:1 |
| GUID | 0 | ||
| Full Reference | Markl, Gregor (2001) Stability of Na–Be minerals in late-magmatic fluids of the Ilímaussaq alkaline complex, South Greenland. Geology of Greenland Survey Bulletin, 190 (190) 145-158 doi:10.34194/ggub.v190.5186 | ||
| Plain Text | Markl, Gregor (2001) Stability of Na–Be minerals in late-magmatic fluids of the Ilímaussaq alkaline complex, South Greenland. Geology of Greenland Survey Bulletin, 190 (190) 145-158 doi:10.34194/ggub.v190.5186 | ||
| In | Sørensen, Henning - Ed. (2001) The Ilímaussaq alkaline complex, South Greenland: status of mineralogical research with new results. Geology of Greenland Survey Bulletin 190. GEUS | ||
| Abstract/Notes | Various Na-bearing Be silicates occur in late-stage veins and in alkaline rocks metasomatised by late-magmatic fluids of the Ilímaussaq alkaline complex in South Greenland. First, chkalovite crystallised with sodalite around 600°C at 1 kbar. Late-magmatic assemblages formed between 400 and 200°C and replaced chkalovite or grew in later veins from an H2O-rich fluid. This fluid is also recorded in secondary fluid inclusions in most Ilímaussaq nepheline syenites. The late assemblages comprise chkalovite + ussingite, tugtupite + analcime ± albite, epididymite + albite, bertrandite ± beryllite + analcime, and sphaerobertrandite + albite or analcime(?). Quantitative phase diagrams involving minerals of the Na–Al–Si–O–H–Cl system and various Be minerals show that tugtupite co-exists at 400°C only with very Na-rich or very alkalic fluids [log (aNa+/aH+) > 6–8; log (aBe2+/(aH+)2) > –3]. The abundance of Na-rich minerals and of the NaOH-bearing silicate ussingite indicates the importance of both of these parameters. Water activity and silica activity in these fluids were in the range 0.7–1 and 0.05–0.3, and XNaCl in a binary hydrous fluid was below 0.2 at 400°C. As bertrandite is only stable at < 220°C at 1 kbar, the rare formation of epididymite, eudidymite, bertrandite and sphaerobertrandite by chkalovite-consuming reactions occurred at still lower temperatures and possibly involved fluids of higher silica activity. | ||
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