Caribbean Plate

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Caribbean plate and faultlines
Detail of tectonic plates from: Tectonic plates of the world.
Detail of the Cocos and Caribbean plates from: Plate tectonics map.
Volcanoes of the Caribbean.

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 the North American Plate, the South American Plate, the Nazca Plate and the Cocos Plate. These borders are regions of intense seismic activity, including frequent earthquakes, occasional tsunamis,[1] and volcanic eruptions.

Boundary types[edit]

The northern boundary with the North American plate is a transform or strike-slip boundary which runs from the border area of Belize, Guatemala (Motagua Fault), and Honduras in Central America, eastward through the Cayman trough on south of the southeast coast of Cuba, and just north of Hispaniola, Puerto Rico, and the Virgin Islands. Part of the Puerto Rico Trench, the deepest part of the Atlantic Ocean (roughly 8,400 meters), lies along this border. The Puerto Rico trench is at a complex transition from the subduction boundary to the south and the transform boundary to the west.

The eastern boundary is a subduction zone, the Lesser Antilles subduction zone, where oceanic crust of the South American Plate is being subducted under the Caribbean Plate. Subduction forms the volcanic islands of the Lesser Antilles Volcanic Arc from the Virgin Islands in the north to the islands off the coast of Venezuela in the south. This boundary contains seventeen active volcanoes, most notably Soufriere Hills on Montserrat;, Mount Pelée on Martinique; La Grande Soufrière on Guadeloupe; Soufrière Saint Vincent on Saint Vincent; and the submarine volcano Kick 'em Jenny which lies about 10 km north of Grenada. Large historical earthquakes in 1839 and 1843 in this region are possibly megathrust earthquakes.[2][3]

Along the geologically complex southern boundary, the Caribbean Plate interacts with the South American Plate forming Barbados, Trinidad and Tobago (all on the Caribbean Plate), and islands off the coast of Venezuela (including the Leeward Antilles) and Colombia. This boundary is in part the result of transform faulting along with thrust faulting and some subduction. The rich Venezuelan petroleum fields possibly result from this complex plate interaction.

The western portion of the plate is occupied by Central America. The Cocos Plate in the Pacific Ocean is subducted beneath the Caribbean Plate, just off the western coast of Central America. This subduction forms the volcanoes of Guatemala, El Salvador, Nicaragua, and Costa Rica, also known as the Central America Volcanic Arc.

Origin[edit]

There are two contending theories as to the origin of the Caribbean Plate.

One holds that it is a large igneous province that formed in the Pacific Ocean tens of millions of years ago. As the Atlantic Ocean widened, North America and South America were pushed westward, separated for a time by oceanic crust. The Pacific Ocean floor subducted under this oceanic crust between the continents. The Caribbean Plate drifted into the same area, but as it was less dense (although thicker) than the surrounding oceanic crust, it did not subduct, but rather overrode the ocean floor, continuing to move eastward relative to North America and South America. With the formation of the Isthmus of Panama 3 million years ago, it ultimately lost its connection to the Pacific.

A more recent theory asserts that the Caribbean Plate came into being from an Atlantic hotspot which no longer exists. This theory points to evidence of the absolute motion of the Caribbean Plate which indicates that it moves westward, not east, and that its apparent eastward motion is only relative to the motions of the North American Plate and the South American Plate.[4]

First American land bridge[edit]

The Caribbean Plate began its eastward migration 80 million years ago (Ma) during the Late Cretaceous. This migration eventually resulted in a volcanic arc stretching from north-western South America to the Yucatán Peninsula, today represented by the Aves Islands and the Lesser and Greater Antilles. This arc was the subject of constant tectonism and sea-level fluctuations but lasted until the mid-Eocene and intermittently formed a land bridge along the eastern and northern boundaries of the Caribbean Plate.[5] (What would eventually become present-day Central America was part of the western plate boundary and still isolated in the Pacific.)

58.5 to 56.5 Ma, during the Late Paleocene, a sea-level low-stand assisted by the continental uplift of the western margin of South America, resulted in a fully operative land bridge over which several groups of mammals apparently took part in an interchange. For example, xenarthrans are known from the Itaboraian SALMA (59–57 Ma), palaeanodonts from the Tiffanian NALMA (57 Ma) and Eurotamandua from the early middle Eocene (50 Ma) of Europe; opossums are known from the Tiupampan/Itaboraian SALMA (64–57 Ma), from the Clarkforkian NALMA (55 Ma); and from the Ypresian in Europe (55 Ma).[5]

See also[edit]

References[edit]

  1. ^ Fernández-Arce, Mario & Guillermo Alvarado-Delgado (December 2005). "Tsunamis and Tsunami Preparedness in Costa Rica, Central America". ISET Journal of Earthquake Technology. Paper No. 466. (Indian Society of Earthquake Technology) 42 (4): 203–212. ISSN 0972-0405. Retrieved August 2008. 
  2. ^ Robson, G. R. (1964). "An Earthquake Catalogue for the Eastern Caribbean 1530-1960". Bulletin of the Seismological Society of America 54 (2): 785–832. 
  3. ^ Feuillet, N.; Beauducel, F.; Tapponnier, P. (2011). "Tectonic context of moderate to large historical earthquakes in the Lesser Antilles and mechanical coupling with volcanoes". Journal of Geophysical Research 116: B10308. Bibcode:2011JGRB..11610308F. doi:10.1029/2011JB008443. 
  4. ^ Meschede, M.; Frisch W. (2002). "The evolution of the Caribbean Plate and its relation to global motion vectors: geometric constraints for an inter-american origin". In Jackson T. A. Caribbean geology: into the third millennium : transactions of the Fifteenth Caribbean Geological Conference. University of West Indies Press. p. 279. ISBN 978-976-640-100-9. 
  5. ^ a b Marshall, L.G.; Sempere, T.; Butler, R.F. (1997). "Chronostratigraphy of the Mammal-Bearing Paleocene of South America". Journal of South American Earth Sciences 10 (1): 63. Bibcode:1997JSAES..10...49M. doi:10.1016/S0895-9811(97)00005-9. Retrieved March 2013. 

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