Cinder Cone
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Cinder Cone

Schematic of the internal structure of a typical cinder cone

A cinder cone is a steep conical hill of loose pyroclastic fragments, such as volcanic clinkers, volcanic ash, or cinder that has been built around a volcanic vent.[1][2] The pyroclastic fragments are formed by explosive eruptions or lava fountains from a single, typically cylindrical, vent. As the gas-charged lava is blown violently into the air, it breaks into small fragments that solidify and fall as either cinders, clinkers, or scoria around the vent to form a cone that often is symmetrical; with slopes between 30-40°; and a nearly circular ground plan.[3] Most cinder cones have a bowl-shaped crater at the summit.[1]

Mechanics of eruption

Cross-section diagram of a cinder cone or scoria cone

The rock fragments are made of pyroclastic material (cinders or scoria); they are often glassy and contain numerous gas bubbles "frozen" into place as magma exploded into the air and then cooled quickly.[2] Lava fragments larger than 64 mm across, known as volcanic bombs, are also a common product of cinder cone eruptions. Cinder cones range in size from tens to hundreds of meters tall.[2] Cinder cones are made of pyroclastic material. Many cinder cones have a bowl-shaped crater at the summit. During the waning stage of a cinder cone eruption, the magma has lost most of its gas content. This gas-depleted magma does not fountain but oozes quietly into the crater or beneath the base of the cone as lava.[4] Lava rarely issues from the top (except as a fountain) because the loose, uncemented cinders are too weak to support the pressure exerted by molten rock as it rises toward the surface through the central vent.[2] Because it contains so few gas bubbles, the molten lava is denser than the bubble-rich cinders.[4] Thus, it often burrows out along the bottom of the cinder cone, lifting the less dense cinders like a cork on water, and advances outward, creating a lava flow around the cone's base.[4] When the eruption ends, a symmetrical cone of cinders sits at the center of a surrounding pad of lava.[4] If the crater is fully breached, the remaining walls form an amphitheater or horseshoe shape around the vent.

Occurrence

Parícutin erupting in 1943

Cinder cones are commonly found on the flanks of shield volcanoes, stratovolcanoes, and calderas.[2] For example, geologists have identified nearly 100 cinder cones on the flanks of Mauna Kea, a shield volcano located on the island of Hawaii.[2]

The most famous cinder cone, Paricutin, grew out of a corn field in Mexico in 1943 from a new vent.[2] Eruptions continued for nine years, built the cone to a height of 424 meters (1,391 ft), and produced lava flows that covered 25 km2 (9.7 sq mi).[2]

The Earth's most historically active cinder cone is Cerro Negro in Nicaragua.[2] It is part of a group of four young cinder cones NW of Las Pilas volcano. Since its initial eruption in 1850, it has erupted more than 20 times, most recently in 1995 and 1999.[2]

Based on satellite images it was suggested that cinder cones might occur on other terrestrial bodies in the solar system too.[5] They were reported on the flanks of Pavonis Mons in Tharsis,[6][7] in the region of Hydraotes Chaos[8] on the bottom of the Coprates Chasma,[9] or in the volcanic field Ulysses Colles.[10] It is also suggested that domical structures in Marius Hills might represent lunar cinder cones.[11]

Effect of environmental conditions

SP Crater, an extinct cinder cone in Arizona

The size and shape of cinder cones depend on environmental properties as different gravity and/or atmospheric pressure might change the dispersion of ejected scoria particles.[5] For example, cinder cones on Mars seem to be more than two times wider than terrestrial analogues[10] as lower atmospheric pressure and gravity enable wider dispersion of ejected particles over a larger area.[5][12] Therefore, it seems that erupted amount of material is not sufficient on Mars for the flank slopes to attain the angle of repose and Martian cinder cones seem to be ruled mainly by ballistic distribution and not by material redistribution on flanks as typical on Earth.[12]

Monogenetic cones

Some cinder cones are monogenetic - the result of a single, never-to-be-repeated eruption. Parícutin in Mexico, Diamond Head, Koko Head, Punchbowl Crater and some cinder cones on Mauna Kea are monogenetic cinder cones.

Monogenetic eruptions can last for more than 10 years.[] Parícutin erupted from 1943 to 1952.

See also

References

  1. ^ a b Poldervaart, A (1971). "Volcanicity and forms of extrusive bodies". In Green, J; Short, NM (eds.). Volcanic Landforms and Surface Features: A Photographic Atlas and Glossary. New York: Springer-Verlag. pp. 1-18. ISBN 978-3-642-65152-6.
  2. ^ a b c d e f g h i j Public Domain This article incorporates public domain material from the United States Geological Survey document: "Photo glossary of volcano terms: Cinder cone".
  3. ^ Clarke, Hilary; Troll, Valentin R.; Carracedo, Juan Carlos (2009-03-10). "Phreatomagmatic to Strombolian eruptive activity of basaltic cinder cones: Montaña Los Erales, Tenerife, Canary Islands". Journal of Volcanology and Geothermal Research. Models and products of mafic explosive activity. 180 (2): 225-245. doi:10.1016/j.jvolgeores.2008.11.014. ISSN 0377-0273.
  4. ^ a b c d Public Domain This article incorporates public domain material from the United States Geological Survey document: Susan S. Priest; Wendell A. Duffield; Nancy R. Riggs; Brian Poturalski; Karen Malis-Clark (2002). "Red Mountain Volcano - A Spectacular and Unusual Cinder Cone in Northern Arizona". USGS Fact Sheet 024-02. Retrieved .
  5. ^ a b c Wood, C.A. (1979). "Cinder cones on Earth, Moon and Mars". Lunar Planet. Sci. Lunar and Planetary Science Conference. X. pp. 1370-72. Bibcode:1979LPI....10.1370W.
  6. ^ Bleacher, J.E.; Greeley, R.; Williams, D.A.; Cave, S.R.; Neukum, G. (2007). "Trends in effusive style at the Tharsis Montes, Mars, and implications for the development of the Tharsis province". J. Geophys. Res. 112 (E9): E09005. Bibcode:2007JGRE..112.9005B. doi:10.1029/2006JE002873.
  7. ^ Keszthelyi, L.; Jaeger, W.; McEwen, A.; Tornabene, L.; Beyer, R.A.; Dundas, C.; Milazzo, M. (2008). "High Resolution Imaging Science Experiment (HiRISE) images of volcanic terrains from the first 6 months of the Mars Reconnaissance Orbiter primary science phase". J. Geophys. Res. 113 (E4): E04005. Bibcode:2008JGRE..113.4005K. CiteSeerX 10.1.1.455.1381. doi:10.1029/2007JE002968.
  8. ^ Meresse, S; Costard, F; Mangold, N.; Masson, Philippe; Neukum, Gerhard; the HRSC Co-I Team (2008). "Formation and evolution of the chaotic terrains by subsidence and magmatism: Hydraotes Chaos, Mars". Icarus. 194 (2): 487. Bibcode:2008Icar..194..487M. doi:10.1016/j.icarus.2007.10.023.
  9. ^ Bro?, Petr; Hauber, Ernst; Wray, James J.; Michael, Gregory (2017). "Amazonian volcanism inside Valles Marineris on Mars". Earth and Planetary Science Letters. 473: 122-130. Bibcode:2017E&PSL.473..122B. doi:10.1016/j.epsl.2017.06.003.
  10. ^ a b Bro?, P; Hauber, E (2012). "A unique volcanic field in Tharsis, Mars: Pyroclastic cones as evidence for explosive eruptions". Icarus. 218 (1): 88-99. Bibcode:2012Icar..218...88B. doi:10.1016/j.icarus.2011.11.030.
  11. ^ Lawrence, SJ; Stopar, Julie D.; Hawke, B. Ray; Greenhagen, Benjamin T.; Cahill, Joshua T. S.; Bandfield, Joshua L.; Jolliff, Bradley L.; Denevi, Brett W.; Robinson, Mark S.; Glotch, Timothy D.; Bussey, D. Benjamin J.; Spudis, Paul D.; Giguere, Thomas A.; Garry, W. Brent (2013). "LRO observations of morphology and surface roughness of volcanic cones and lobate lava flows in the Marius Hills". J. Geophys. Res. Planets. 118 (4): 615-34. Bibcode:2013JGRE..118..615L. doi:10.1002/jgre.20060.
  12. ^ a b Bro?, Petr; ?adek, Ond?ej; Hauber, Ernst; Rossi, Angelo Pio (2014). "Shape of scoria cones on Mars: Insights from numerical modeling of ballistic pathways". Earth and Planetary Science Letters. 406: 14-23. Bibcode:2014E&PSL.406...14B. doi:10.1016/j.epsl.2014.09.002.

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