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Silicate melt inclusions from a mildly peralkaline granite in the Oslo paleorift, Norway

Published online by Cambridge University Press:  05 July 2018

T. H. Hansteen  and
W. J. Lustenhouwer
T. H. Hansteen
Affiliation:
Mineralogical-Geological Museum, Sars Gate 1, N-0562 Oslo 5, Norway
W. J. Lustenhouwer
Affiliation:
Netherlands Organization for Scientific Research (NWO), the Free University, N-1007 MC Amsterdam, The Netherlands
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Abstract

The mildy peralkaline Eikeren-Skrim granite belongs to the Permian magmatic province of the Oslo rift, south-east Norway. Euhedral quartz crystals from the abundant miarolitic cavities contain primary inclusions of partly crytallized silicate melts and coexisting primary, aqueous fluid inclusions. Micro-thermometric measurements give maximum estimates for the granite solidus of 685–705°C. Quenched silicate melt inclusions are not peralkaline, have normative Or/Ab weight ratios of 1.15–1.44 (compared to 0.49–0.80 in whole-rock samples) and F and Cl contents of 0.1 and 0.21–0.65 wt. %, respectively. Coexisting magmatic fluid inclusions are highly enriched in Na, Cl, S and to some extent K. These chemical characteristics are the results of late-magmatic melt-mineral-fluid interaction in the miarolitic cavities.

Keywords

silicate melt inclusionsgraniteperalkalineOslo riftNorway
Type
Magmatic/metamorphic environment
Information
Mineralogical Magazine , Volume 54 , Issue 375 , June 1990 , pp. 195 - 205
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1990

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Footnotes

*

Present address: Nordic Volcanological Institute, University of Iceland, Geoscience Building, 101 Reykjavik, Iceland.

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