The Central American Volcanic Arc (often abbreviated to CAVA) is a chain of

volcanoes A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. On Earth, volcanoes are most often found where tectonic plates a ...

which extends parallel to the

Pacific The Pacific Ocean is the largest and deepest of Earth's five oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean (or, depending on definition, to Antarctica) in the south, and is bounded by the contine ...

coastline of the

Central American Isthmus Central America ( es, América Central or ) is a subregion of the Americas. Its boundaries are defined as bordering the United States to the north, Colombia to the south, the Caribbean Sea to the east, and the Pacific Ocean to the west. Ce ...

, from

Mexico Mexico (Spanish: México), officially the United Mexican States, is a country in the southern portion of North America. It is bordered to the north by the United States; to the south and west by the Pacific Ocean; to the southeast by Guatema ...

Panama Panama ( , ; es, link=no, Panamá ), officially the Republic of Panama ( es, República de Panamá), is a transcontinental country spanning the southern part of North America and the northern part of South America. It is bordered by Co ...

. This volcanic arc, which has a length of 1,100 kilometers (680 mi)Rose, W., Conway, F., Pullinger, C., Deino, A. and McIntosh, W., 1999. An improved age framework for late Quaternary silicic eruptions in northern Central America. ''Bulletin of Volcanology'', 61(1-2), pp.106-120. is formed by an active subduction zone, with the

Cocos Plate The Cocos Plate is a young oceanic tectonic plate beneath the Pacific Ocean off the west coast of Central America, named for Cocos Island, which rides upon it. The Cocos Plate was created approximately 23 million years ago when the Farallon Plate ...

subducting underneath the

Caribbean Plate The Caribbean Plate is a mostly oceanic tectonic plate underlying Central America and the Caribbean Sea off the north coast of South America. Roughly 3.2 million square kilometers (1.2 million square miles) in area, the Caribbean Plate borders ...

.Álvarez-Gómez, J., Meijer, P., Martínez-Díaz, J. and Capote, R., 2008. Constraints from finite element modeling on the active tectonics of northern Central America and the Middle America Trench. ''Tectonics'', 27(1) The region has been volcanically and geologically active for at least the past several million years. Numerous volcanoes are spread throughout various Central American countries; many have been active in the geologic past, some more so than others.

Tectonic history

The Cocos

tectonic plate Plate tectonics (from the la, label=Late Latin, tectonicus, from the grc, τεκτονικός, lit=pertaining to building) is the generally accepted scientific theory that considers the Earth's lithosphere to comprise a number of large te ...

is along the western edge of

Central America Central America ( es, América Central or ) is a subregion of the Americas. Its boundaries are defined as bordering the United States to the north, Colombia to the south, the Caribbean Sea to the east, and the Pacific Ocean to the west. ...

. The latter is along the western edge of the Caribbean tectonic plate and can be split into two distinct regimes. These regimes are demarcated roughly by the

Costa Rican Costa Rica (, ; ; literally "Rich Coast"), officially the Republic of Costa Rica ( es, República de Costa Rica), is a country in the Central American region of North America, bordered by Nicaragua to the north, the Caribbean Sea to the n ...

-Nicaragua, Nicaraguan border and can be differentiated by the different tectonic histories of each respective area. The southern portion is part of a Magmatism, magmatic arc, while the northern one is associated with several Active margin, active margins. Different types of Fault (geology), faults also exist within each regime and further serve to differentiate the northern and southern regions’ geologic and tectonic histories from one another. This Caribbean-Cocos tectonic plate interaction can further explain the volcanism and geologic history of the region. While previous literature has shown a wide range of ages for the subduction of the Cocos plate, it is now believed that this subduction began between two million years ago and three million years ago (between 2 Year, Ma and 3 Ma),MacMillan, I., Gans, P. and Alvarado, G., 2004. Middle Miocene to present plate tectonic history of the southern Central American Volcanic Arc. ''Tectonophysics'', 392(1-4), pp.325-348.Morell, K., Kirby, E., Fisher, D. and van Soest, M., 2012. Geomorphic and exhumational response of the Central American Volcanic Arc to Cocos Ridge subduction. ''Journal of Geophysical Research: Solid Earth'', 117(B4) though the area has been geologically active since at least 12 Ma, as evidenced by plate and plate boundary movements, as well as scarp subduction in the area. A gap in volcanism in Central America between 12 Ma and 5 Ma is understood to have occurred as well. Furthermore, the subduction of the Cocos tectonic plate itself is not thought to be what caused some of the changes in volcanism associated with the Central American Volcanic Arc; while the subduction of the Cocos Ridge is a continual event that has influenced volcanism in Central America, the subduction of the Coiba Plate, Coiba Ridge—a microplate in the region-- is thought to be the triggering event that instigated changes in volcanic activity in the geologic past. In short, the interaction of numerous tectonic plates—namely the Cocos Plate, Cocos, Caribbean Plate, Caribbean, North American Plate, North American, and Coiba Plate, Coiba plates—over the past several million years has helped facilitate the continual existence of the Central American Volcanic Arc, influencing the tectonic and broad geologic history of the area.

Contemporary regional overview

The Central American Volcanic Arc consists of hundreds of volcanic formations, including Stratovolcano, stratovolcanoes, Stratovolcano, composite volcanos, Caldera, calderas, and Lava dome, lava domes. From a depositional standpoint, Volcanic ash, ash falls, ash flows, and deposits of tephra are prevalent throughout the region.Williams, S. and Self, S., 1983. The October 1902 plinian eruption of Santa Maria volcano, Guatemala. ''Journal of Volcanology and Geothermal Research'', 16(1-2), pp.33-56. Isotopes of carbon, Carbon and Isotopes of argon, argon isotope dating has been used to date these deposits to the Quaternary, and it is suspected that several of these volcanos have been sporadically active for much of the past 200,000 years. Some volcanos in the area have even produced large explosive eruptions in the recent past, including the October 25, 1902, eruption of the Santa María (volcano), Santa Maria volcano in Guatemala. This Plinian eruption spewed upwards of twenty cubic kilometers of ash almost thirty kilometers into the sky. Much of this ash was fine-grained, averaging less than 2 millimeters in size. Similarly, Cerro Negro, a 250-meter-tall volcano in northwest Nicaragua, erupted in 1971, 1992, and 1995.Roggensack, K., Hervig, R., McKnight, S. and Williams, S., 1997. Explosive Basaltic Volcanism from Cerro Negro Volcano: Influence of Volatiles on Eruptive Style. ''Science'', 277(5332), pp.1639-1642. The two latter eruptions, occurring in the 1990’s, had similar magmatic compositions to one another, both broadly basaltic. However, as the water and carbon dioxide contents of each eruption were different—with the earlier eruption having higher levels of carbon dioxide and water vapor, and the later eruption degassing many of its volatiles-- markedly different styles of eruption occurred, with the 1992 eruption of Cerro Negro much more explosive than its 1995 counterpart. Other volcanos in Central America include the Salvadorian Santa Ana Volcano, Santa Ana, Izalco (volcano), Izalco, and San Salvador (volcano), San Salvador volcanoes, the Nicaraguan Masaya Volcano, Masaya volcano, and the Costa Rican Miravalles Volcano, Miravalles, Irazú Volcano, Irazú, and Poás Volcano, Poás volcanoes.Melián, G. et al., 2005. Subduction process and diffuse CO₂ degassing rates along Central America volcanic arc, ''Geophysical Research Abstracts'', Vol. 7, 09598, 2005 Many remain sporadically active to this day, and likely will continue to be active into the future, as geologic and tectonic processes continue to shape the region. File:Active Margin.svg, Graphical representation of a subduction zone File:VolcanesdeGuatemala00 D.png, Volcanic front of the Sierra Madre de Chiapas, Sierra Madre

Notes

References

* Abratis, M., 1998. Geochemical variations in magmatic rocks from southern Costa Rica as a consequence of Cocos Ridge subduction and uplift of the Cordillera de Talamanca. PhD thesis, Universitat zu Gottingen, p. 134. * Álvarez-Gómez, J., Meijer, P., Martínez-Díaz, J. and Capote, R., 2008. Constraints from finite element modeling on the active tectonics of northern Central America and the Middle America Trench. ''Tectonics'', 27(1) * Collins, L.S., Coates, A.G., Jackson, J.B.C., Obando, J.A., 1995. Timing and rates of emergence of the Limon and Bocas del Toro basins: Caribbean effects of Cocos Ridge subduction? In: Mann, P. (Ed.), Geologic and Tectonic Development of the Caribbean Plate Boundary in Southern Central America. Spec. Pap.-Geol. Soc. Am. 295, pp. 263– 289. * deBoer, J.Z., Drummond, M.S., Bordelon, M.J., Defant, M.J., Bellon, H., Maury, R.C., 1995. Cenozoic magmatic phases of the Costa Rican island arc (Cordillera de Talamanca). In: Mann, P. (Ed.), Geologic and Tectonic Development of the Caribbean Plate Boundary in Southern Central America. Spec. Pap.-Geol. Soc. Am. 295, pp. 35– 55. * Grafe, K., 1998. Exhumation and thermal evolution of the Cordillera de Talamanca (Costa Rica): constraints from fission track analysis, ⁴⁰Ar – ³⁹Ar and ⁸⁷Rb– ⁸⁷Sr chronology. PhD thesis, Universitat Tubingen, p. 113. * Lonsdale, P., Klitgord, K.D., 1978. Structure and tectonic history of the eastern Panama Basin. Geol. Soc. Amer. Bull. 89, 981–999. * MacMillan, I., Gans, P. and Alvarado, G., 2004. Middle Miocene to present plate tectonic history of the southern Central American Volcanic Arc. ''Tectonophysics'', 392(1-4), pp.325-348. * Melián, G. et al., 2005. Subduction process and diffuse CO₂ degassing rates along Central America volcanic arc, ''Geophysical Research Abstracts'', Vol. 7, 09598, 2005 * Morell, K., Kirby, E., Fisher, D. and van Soest, M., 2012. Geomorphic and exhumational response of the Central American Volcanic Arc to Cocos Ridge subduction. ''Journal of Geophysical Research: Solid Earth'', 117(B4) * Roggensack, K., Hervig, R., McKnight, S. and Williams, S., 1997. Explosive Basaltic Volcanism from Cerro Negro Volcano: Influence of Volatiles on Eruptive Style. ''Science'', 277(5332), pp.1639-1642. * Rose, W., Conway, F., Pullinger, C., Deino, A. and McIntosh, W., 1999. An improved age framework for late Quaternary silicic eruptions in northern Central America. ''Bulletin of Volcanology'', 61(1-2), pp.106-120. * Whattam, S. and Stern, R., 2015. Arc magmatic evolution and the construction of continental crust at the Central American Volcanic Arc system. ''International Geology Review'', 58(6), pp.653-686. * Williams, S. and Self, S., 1983. The October 1902 plinian eruption of Santa Maria volcano, Guatemala. ''Journal of Volcanology and Geothermal Research'', 16(1-2), pp.33-56. {{coord, 10, 26, 31, N, 84, 41, 17, W, type:mountain_source:kolossus-ruwiki, display=title Central America Volcanic Arc, Volcanoes of Guatemala Volcanoes of El Salvador Volcanoes of Honduras Volcanoes of Nicaragua Volcanoes of Costa Rica Volcanoes of Panama Regions of Central America Volcanic arcs