Rhyolite

Rhyolite (/ˈraɪ.ə.laɪt, ˈraɪ.oʊ-/ RY-ə-lyte, RY-oh-) is the most silica-rich of volcanic rocks. It is generally glassy or fine-grained (aphanitic) in texture, but may be porphyritic, containing larger mineral crystals (phenocrysts) in an otherwise fine-grained rock. The mineral assemblage is predominantly quartz, sanidine and plagioclase. It is the extrusive equivalent to granite.

For other uses, see Rhyolite (disambiguation).
Rhyolite
Igneous rock
Composition
Felsic: igneous quartz and alkali feldspar (sanidine and sodic plagioclase), biotite and hornblende

Magma with the composition of rhyolite is extremely viscous, due to its high silica content. This favors explosive eruptions over effusive eruptions, so rhyolitic magma is more often erupted as pyroclastic rock than as lava flows. Rhyolitic ash-flow tuffs are among the most voluminous of continental igneous rock formations.

Rhyolitic tuff has been extensively used for construction. Obsidian, which is rhyolitic volcanic glass, has been used for tools from prehistoric times to the present day because it can be shaped to an extremely sharp edge. Rhyolitic pumice finds use as an abrasive, in concrete, and as a soil amendment.

Description
QAPF diagram with rhyolite field highlighted
TAS diagram with rhyolite field highlighted

Rhyolite is an extrusive igneous rock, formed from magma rich in silica that is extruded from a vent to cool quickly on the surface rather than slowly in the subsurface. It is generally light in color due to its low content of mafic minerals, and it is typically very fine-grained (aphanitic) or glassy.[1]

An extrusive igneous rock is classified as rhyolite when quartz constitutes 20% to 60% by volume of its total content of quartz, alkali feldspar, and plagioclase (QAPF) and alkali feldspar makes up 35% to 90% of its total feldspar content. Feldspathoids are not present. This makes rhyolite the extrusive equivalent of granite. However, while the IUGS recommends classifying volcanic rocks on the basis of their mineral composition whenever possible, volcanic rocks are often glassy or so fine-grained that mineral identification is impractical. The rock must then be classified chemically based on its content of silica and alkali metal oxides (K2O plus Na2O). Rhyolite is high in silica and total alkali metal oxides, placing it in the R field of the TAS diagram.[2][3][4][5]:140–146

The alkali feldspar in rhyolites is sanidine or, less commonly, orthoclase. It is rarely anorthoclase. These feldspar minerals sometimes are present as phenocrysts. The plagioclase is usually sodium-rich (oligoclase or andesine). Cristobalite and trydimite are sometimes present along with the quartz. Biotite, augite, fayalite, and hornblende are common accessory minerals.[1]

Geology

Due to their high content of silica and low iron and magnesium contents, rhyolitic magmas form highly viscous lavas.[5]:23–26 As a result, many eruptions of rhyolite are highly explosive, and rhyolite occurs more frequently as pyroclastic rock than as lava flows.[6]:22 Rhyolitic ash flow tuffs are the only volcanic product with volumes rivaling those of flood basalts.[5]:77 Rhyolites also occur as breccias or in lava domes, volcanic plugs, and dikes.[7][8][5]:71–72 Rhyolitic lavas erupt at a relatively low temperature of 800 °C to 1000 °C, significantly cooler than basaltic lavas, which typically erupt at temperatures of 1100 °C to 1200 °C.[5]:20

Rhyolites that cool too quickly to grow crystals form a natural glass or vitrophyre, also called obsidian.[9] Slower cooling forms microscopic crystals in the lava and results in textures such as flow foliations, spherulitic, nodular, and lithophysal structures. Some rhyolite is highly vesicular pumice.[1]

Eruptions of rhyolite are relatively rare compared to eruptions of less felsic lavas. Only four eruptions of rhyolite have been recorded since the start of the 20th century: at the St. Andrew Strait volcano in Papua New Guinea and Novarupta volcano in Alaska as well as at Chaiten and Cordon Caulle volcanoes in southern Chile.[10][11] The eruption of Novarupta in 1912 was the largest volcanic eruption of the 20th century,[12] and began with explosive volcanism that later transitioned to effusive volcanism and the formation of a rhyolite dome in the vent.[13]

Petrogenesis

Rhyolite magmas can be produced by igneous differentiation of a more mafic (silica-poor) magma, through fractional crystallization or by assimilation of melted crustal rock (anatexis). Associations of andesites, dacites, and rhyolites in similar tectonic settings and with similar chemistry suggests that the rhyolite members were formed by differentiation of mantle-derived basaltic magmas at shallow depths. In other cases, the rhyolite appears to be a product of melting of crustal sedimentary rock.[6]:21 Water vapor plays an important role in lowering the melting point of silicic rock,[6]:43 and some rhyolitic magmas may have a water content as high as 7–8 weight percent.[14][15]:44

Occurrence

Rhyolite has been found on islands far from land, but such oceanic occurrences are rare.[16]

Europe
Rhyolite in the Kaldaklofsfjöll, Landmannalaugar, Iceland
Germany
Rhyolite quarry, Löbejün, Saxony-Anhalt

North America
Mount Haynes, an eroded remnant of a rhyolite dome in Yellowstone National Park, USA

South America
  • southern Peru, rhyolite tuff flows known as sillar[26]

Oceania
Mount Tibrogargan, a rhyolite volcanic plug in Queensland, Australia

Asia

Africa

Antarctica

Name

The name rhyolite was introduced into geology in 1860 by the German traveler and geologist Ferdinand von Richthofen[30][31][32] from the Greek word rhýax ("a stream of lava")[33] and the rock name suffix "-lite".[34]

Uses

In North American pre-historic times, rhyolite was quarried extensively in eastern Pennsylvania in the United States. Among the leading quarries was the Carbaugh Run Rhyolite Quarry Site in Adams County. Rhyolite was mined there starting 11,500 years ago.[35] Tons of rhyolite were traded across the Delmarva Peninsula,[35] because the rhyolite kept a sharp point when knapped and was used to make spear points and arrowheads.[36]

Obsidian is usually of rhyolitic composition, and it has been used for tools since prehistoric times.[37] Obsidian scalpels have been investigated for use in delicate surgery.[38] Pumice, also typically of rhyolitic composition, finds important uses as an abrasive, in concrete,[39] and as a soil amendment.[40] Rhyolitic tuff was used extensively for construction in ancient Rome[41] and has been used in construction in modern Europe.[15]:138

See also
  • Bimodal volcanism – The eruption of both mafic and felsic lavas from a single volcanic centre
  • Comendite – A hard, peralkaline igneous rock, a type of light blue grey rhyolite
  • List of rock types – A list of rock types recognized by geologists
  • Pantellerite – A peralkaline rhyolite type of volcanic rock
  • Thunderegg – A nodule-like rock, that is formed within rhyolitic volcanic ash layers

References
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