Abstract
Two kinds of rhyolite outcrop N and NW of the Donon (Northern Vosges mountains). The most spread kind is sheet shaped. This phenocryst poor rock has a high MgO grade. It must be linked to the ignimbrites. The badly welded particles allowing an easy circulation of fumaroles are replaced by a micropoikilitic mass of quartz and feldspar. The second kind — Blancrupt's rhyolite — is dome shaped. It is a potassic rhyolite and seems to be a microgranite owing to the great amount of phenocrysts.
Full Text 
Sign-in/Register to access full text options
Sign-in/Register to access full text options 
Published version (
Free)
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
