Sentences with phrase «of rhyolite»
The cuts had produced straight trenches 30 feet wide and 50 feet deep; to make them, Heizer had moved 240,000 tons of rhyolite and sandstone.
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The waterfall cascades over 100m of rhyolite cliffs, which once were a part of the huge Tweed Volcano.
When this superheated water rises from underground, it passes and often partially melts old lava flow deposits of rhyolite, a volcanic rock of silica - rich composition.
Not exact matches
Pumice is a highly vesicular pyroclastic igneous rock of intermediate to siliceous magmas including rhyolite, trachyte and phonolite.
The source magma of this rock is classified as acidic, or high in silica to intermediate (rhyolite, dacite, or andesite.
Shellnutt (2017), in a succinct review of the Panjal Traps (c. 290 Ma), an important component of the Himalayan magmatic province, discusses the synchronous nature of basalts, that chemically range from continental tholeiite to ocean - floor basalt, and crustally derived silicic volcanic rocks (rhyolites and trachytes: 206Pb / 238U zircon in situ age of 289 ± 3 Ma), that developed in a shallow lithospheric rift with significant mingling between crustal melts and mafic magmas.
The island is formed from a cluster of eighteen lava domes, with rhyolite and pyroclastic ash deposits.