Keratophyre
From Infogalactic: the planetary knowledge core
Keratophyre is a volcanic rock of intermediate composition. Although similar to trachyte, keratophyre's plagioclase component is richer in sodium than the plagioclase found in trachyte.[1] Keratophyre forms lava flows and subvolcanic intrusions (dykes and sills). Keratophyre occurs, for example, at Hüttenrode in the Harz Mountains of Germany and in the Berwyn Hills of Wales.[2] Keratophyre tuff of Early Devonian age occurs in Sauerland (Germany).[3]
The term quartz keratophyre has traditionally been used in the Nordic countries to describe a metamorphosed, felsic extrusive rock, corresponding to rhyolite, dacite, or rhyodacite according to IUGS terminology.[4]
References
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- ↑ Slagstad, T.: Geochemistry of trondhjemites and mafic rocks in the Bymarka ophiolite fragment, Trondheim, Norway: Petrogenesis and tectonic implications. Norwegian Journal of Geology, vol. 83, pp. 167-185. Trondheim 2003, ISSN 0029-196X
