Silicate melt inclusions from a mildly peralkaline granite in the Oslo paleorift, Norway
- 1 June 1990
- journal article
- Published by Mineralogical Society in Mineralogical Magazine
- Vol. 54 (375) , 195-205
- https://doi.org/10.1180/minmag.1990.054.375.06
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
This publication has 1 reference indexed in Scilit:
- Columnar stromatolites and late Precambrian stratigraphyAmerican Journal of Science, 1969