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Rhyolite is common along convergent plate boundaries, where a slab of oceanic lithosphere is being subducted into the Earth's mantle beneath overriding oceanic or continental lithosphere. It can sometimes be the predominant igneous rock type in these settings. Rhyolite is more common when the overriding lithosphere is continental rather than ...
The ancient Ballena River brought rhyolite-gravel, or "Poway" clasts, from a region in present-day Sonora, Mexico to the Pacific Ocean. Its sediments deposited into an alluvial fan–submarine canyon–submarine fan complex extending for miles offshore. Remnants of submarine fan facies outcrops are found as far west as the northern Channel Islands.
It is accepted by some in the archaeological community that it is the site of a quarry, used together with one at Carn Goedog, for gathering stones used at Stonehenge, most notably as the source of some of the foliated rhyolite found in the Stonehenge "debitage".
The mechanical properties of the rhyolite on Mount Kineo exhibits the physical properties of flint and was used extensively by indigenous peoples to make arrowheads and implements and thus, has often been referred to as "Kineo flint" in literature; but this term misleads by implication that the rhyolite is a cryptocrystalline form of the ...
Llanite is a porphyritic rhyolite with distinctive phenocrysts of blue quartz (a rare quartz color) and perthitic feldspar (light grayish-orangeish). The brown, fine-grained groundmass consists of very small quartz, feldspar, and biotite mica crystals.
The Biden administration has taken a significant step in its expedited environmental review of what could become the third lithium mine in the U.S., amid anticipated legal challenges from ...
The rhyolite tuff member is the lowest stratigraphic exposure of the Newbury Volcanic Complex. This member is made up of glassy fragments of rhyolitic tuff that is heavily sheared and is crudely held together and is about 6 m in thickness and yellowish-brown to brownish-gray in color.
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