Oca-Ancón Fault System

Oca-Ancón Fault
Oca-Ancón Fault
Falla Oca-Ancón
Age	Late Pleistocene-Holocene
Orogeny	Andean

The Oca-Ancón Fault System (

strike-slip type and extends for an approximate length of 830 km (520 mi).^[1]^[2]^[3] The Oca-Ancón Fault System is part of the diffuse boundary between the Caribbean Plate and the South American Plate.^[4] The movement rate of the Oca-Ancón Fault System is estimated at 2 millimetres (0.079 in) each year, more than most Venezuelan faults.^[2]

Oca Fault segment

The vertical to subvertical Oca Fault segment in the western part of the fault system has a length of 265 kilometres (165 mi), running west–east through La Guajira, Colombia. It forms the northern boundary of the Sierra Nevada de Santa Marta and cuts through the Serranía del Perijá continuing into Venezuela. The fault segment with a slip rate of 0.2 to 0.8 millimetres (0.0079 to 0.0315 in) per year has been active since the Late Pleistocene (~15,000 years ago) and its most recent activity has been registered in 1834.^[1]

References

^ ^a ^b Paris et al., 2000, p.9
^ ^a ^b Audemard et al, 2006
^ Audemard et al., 1996a
^ Audemard et al., 1996b

Bibliography

Audemard M., Franck A.; André Singer P., and Jean-Pierre Soulas. 2006. Quaternary faults and stress regime of Venezuela. Revista de la Asociación Geológica Argentina 61(4). 480–491. Accessed 2015-11-24.
Audemard M., Franck A., and André Singer P.. 1996a. Active fault recognition in northwestern Venezuela and its seismogenic characterization: Neotectonic and paleoseismic approach. Geofísica Internacional 35(3). 245–255. Accessed 2017-06-20.
Audemard M., Franck A.. 1996b. Paleoseismicity studies on the Oca-Ancón fault system, northwestern Venezuela. Tectonophysics 259(). 67–80. Accessed 2017-06-20.
Paris, Gabriel; Michael N. Machette; Richard L. Dart, and Kathleen M. Haller. 2000. Map and Database of Quaternary Faults and Folds in Colombia and its Offshore Regions, 1–66. USGS. Accessed 2017-06-20.

[Paris2000_p9-1] Paris et al., 2000, p.9

[Audeetal2006-2] Audemard et al, 2006

[Audeetal1996a-3] Audemard et al., 1996a

[Audeetal1996b-4] Audemard et al., 1996b

[1]

[2]

[3]

[4]

v t e Major South American geological features
Tectonic plates	Antarctic Caribbean Cocos Coiba Malpelo Nazca North Andes Scotia South American
Cratons and shields	Amazonian Craton Arequipa-Antofalla Craton Atlantic Shield Central Brazilian Shield Guiana Shield Paranapanema Block Río Apa Craton Río de la Plata Craton São Francisco Craton Uruguayan Shield
Structures undergoing subduction	Antarctic Plate Carnegie Ridge Chile Rise Juan Fernández Ridge Malpelo Ridge Nazca Plate Nazca Ridge
Faults and shear zones	Atacama Boconó Bucaramanga-Santa Marta Cochabamba Cordillera Blanca Córdoba Dolores-Guayaquil Domeyko Eastern Frontal Gastre Huincul Liquiñe-Ofqui Magallanes-Fagnano Meta Morón Oca-Ancón Pernambuco El Pilar Romeral San Ramón Sarandí del Yí Sierra Ballena Sobral El Tigre Trans-Brazilian
Rifts and grabens	Aguapeí Amazon Rift Asunción Rift Cuyo Rift Espino Neuquén Rifts Paramirim Salta Rifts
Sedimentary basins	Altiplano Amazon Andean foreland Central Brazil Chaco Colorado Cuyo Eastern Venezuela Golfo San Jorge Magallanes Malvinas Neuquén Pantanal Paraíba Paraná Salta Solimões
Orogenies	Andean Brasiliano Cariri Velhos Chonide Famatinian Gondwanide Juruá Pampean San Rafael Sunsás Terra Australis Tilcarian
Metallogenetic provinces	Bolivian Tin Belt Chilean Iron Belt Deseado Massif El Indio Gold Belt El Mutún Iron Quadrangle Lithium Triangle Pampean Pegmatite Province
Volcanic provinces	Andean North Central South Austral Caribbean Central Atlantic Paraná and Etendeka
Hotspots	Ascension Noronha hotspot Galápagos Juan Fernández San Felix Trindade