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A number of episyenite occurrences within the Neoproterozoic Bohus granite, southwestern Sweden, were investigated in order to elucidate their genesis and past associated fluid regimes. Fluid inclusion microthermometry and O–H isotope systematics integrated with information from detailed mineralogy reveal a paragenetic succession within individual episyenites, including: (1) albitization of plagioclase,...
Hydrothermally intergrown xenotime-monazite from an episyenite in the Bohus granite, southwest Sweden, has been analyzed in situ by ion microprobe. Although the analysed xenotime crystals are extremely small, sometimes less than the ion beam diameter (~17 μm), they retain relatively undisturbed U-Pb systems, which yielded a 206 Pb/ 238 U age of 252+/-8 Ma. The evolution...
A number of in-situ experiments, aimed at investigating geological, hydrogeological and hydromechanical aspects of HDR reservoir development were carried out at the Fjallbacka test site in western Sweden between 1984 and 1995. By means of hydraulic stimulations, a roughly horizontal reservoir that connects two 500<space>m deep wells was created. An open-loop circulation test performed between...
The petrography and geochemistry of two subsurface occurrences of pervasively albitized and episyenitized (i.e. dequartzified) granite in the central part of the postkinematic Sveconorwegian Bohus granite, in southwestern Sweden, were studied. The altered granite is whitened and consists of an albite-microcline framework with a very fine-grained interstitial assemblage of illite + hematite + ankerite...
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