More than 63% of silica is present in felsic and silicic magmas. Magmas made up of rhyolite and dacite are among them. These magmas are extremely viscous due to their silica content, ranging from 108 ...
Thundereggs specifically form in rhyolitic lava. Rhyolitic lava flows are volcanic flows composed of rhyolite — a high-silica ...
Within shallow felsic intrusions cutting up through massive dolomite and along the silicified and brecciated intrusive contacts, as occurs in the ERT. Within shallow intrusions trapped beneath ...