List of tectonic plates

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Map of Earth's 16 principal tectonic plates.[1]

Types of plate boundary:

Convergent


Divergent

  Extension zone
  Spreading center

Transform

  Dextral transform
  Sinistral transform
Plate tectonics map from NASA

This is a list of tectonic plates on Earth's surface. Tectonic plates are pieces of Earth's crust and uppermost mantle, together referred to as the lithosphere. The plates are around 100 km (62 mi) thick and consist of two principal types of material: oceanic crust (also called sima from silicon and magnesium) and continental crust (sial from silicon and aluminium). The composition of the two types of crust differs markedly, with mafic basaltic rocks dominating oceanic crust, while continental crust consists principally of lower-density felsic granitic rocks.

Current plates

Geologists generally agree that the following tectonic plates currently exist on Earth's surface with roughly definable boundaries. Tectonic plates are sometimes subdivided into three fairly arbitrary categories: major (or primary) plates, minor (or secondary) plates, and microplates (or tertiary plates).[2]

Major plates

Map showing Earth's principal tectonic plates and their boundaries in detail

These plates comprise the bulk of the continents and the Pacific Ocean. For purposes of this list, a major plate is any plate with an area greater than 20 million km2 (7.7 million sq mi).

  • Earth:African plate – Tectonic plate underlying Africa – 61,300,000 km2 (23,700,000 sq mi)
  • Earth:Antarctic plate – Major tectonic plate containing Antarctica and the surrounding ocean floor – 60,900,000 km2 (23,500,000 sq mi)
  • Earth:Eurasian plate – Tectonic plate which includes most of Eurasia – 67,800,000 km2 (26,200,000 sq mi)
  • Earth:Indo-Australian plate – Major tectonic plate formed by the fusion of the Indian and Australian plates (sometimes considered to be two separate tectonic plates) – 58,900,000 km2 (22,700,000 sq mi)
  • Earth:North American plate – Large tectonic plate including most of North America, Greenland and part of Siberia – 75,900,000 km2 (29,300,000 sq mi)
  • Earth:Pacific plate – Oceanic tectonic plate under the Pacific Ocean – 103,300,000 km2 (39,900,000 sq mi)
  • Earth:South American plate – Major tectonic plate – 43,600,000 km2 (16,800,000 sq mi)

Minor plates

These smaller plates are often not shown on major plate maps, as the majority of them do not comprise significant land area. For purposes of this list, a minor plate is any plate with an area less than 20 million km2 (7.7 million sq mi) but greater than 1 million km2 (0.39 million sq mi).

  • Earth:Amur plate – Minor tectonic plate in eastern Asia
  • Earth:Arabian plate – Minor tectonic plate – 5,000,000 km2 (1,900,000 sq mi)
  • Earth:Burma plate – Minor tectonic plate in Southeast Asia – 1,100,000 km2 (420,000 sq mi)
  • Earth:Caribbean plate – Tectonic plate in Central America and the Caribbean – 3,300,000 km2 (1,300,000 sq mi)
  • Earth:Caroline plate – Minor oceanic tectonic plate north of New Guinea – 1,700,000 km2 (660,000 sq mi)
  • Earth:Cocos plate – Young oceanic tectonic plate beneath the Pacific Ocean off the west coast of Central America – 2,900,000 km2 (1,100,000 sq mi)
  • Earth:Indian plate – Minor plate that separated from Gondwana – 11,900,000 km2 (4,600,000 sq mi)
  • Earth:Nazca plate – Oceanic tectonic plate in the eastern Pacific Ocean basin – 15,600,000 km2 (6,000,000 sq mi)[note 1]
  • Earth:New Hebrides plate – Minor Pacific Ocean tectonic plate – 1,100,000 km2 (420,000 sq mi)
  • Earth:Philippine Sea plate – Oceanic tectonic plate to the east of the Philippines – 5,500,000 km2 (2,100,000 sq mi)
  • Earth:Scotia plate – Minor oceanic tectonic plate between the Antarctic and South American plates – 1,600,000 km2 (620,000 sq mi)
  • Earth:Somali plate – Minor tectonic plate including the east coast of Africa and the adjoining seabed – 16,700,000 km2 (6,400,000 sq mi)
  • Earth:Sunda plate – Tectonic plate including Southeast Asia
  • Earth:Yangtze plate – Tectonic plate carrying the bulk of southern China

Microplates

These plates are often grouped with an adjacent principal plate on a tectonic plate world map. For purposes of this list, a microplate is any plate with an area less than 1,000,000 km2 (390,000 sq mi). Some models identify more minor plates within current orogens (events that lead to a large structural deformation of Earth's lithosphere) like the Apulian, Explorer, Gorda, and Philippine Mobile Belt plates.[3] The latest studies have shown that microplates are the basic elements of which the crust is composed and that the larger plates are composed of amalgamations of these, and a subdivision of ca. 1200 smaller plates has come forward.[4][5]

The new Global Tectonic Map with the subdivision of the continents, oceans and mobile mountain belts in ca. 1200 smaller plates. Legend: green: terrane (microplate) boundaries in the continental blocks; cyan: terranes of the oceanic plates; orange: terranes inside the mobile belts; blue: oceanic transform faults; red: fault zones in the continental and mountain belt domain; purple: main subduction zones and suture zones; orange dots: volcanoes.

Ancient tectonic plates

In the history of Earth, many tectonic plates have come into existence and have over the intervening years either accreted onto other plates to form larger plates, rifted into smaller plates, or have been crushed by or subducted under other plates.

The following is a list of ancient cratons, microplates, plates, and terranes which no longer exist as separate plates. Cratons are the oldest and most stable parts of the continental lithosphere, and shields are exposed parts of them. Terranes are fragments of crustal material formed on one tectonic plate and accreted to crust lying on another plate, which may or may not have originated as independent microplates: a terrane may not contain the full thickness of the lithosphere.

African plate

  • Earth:Atlantica – Ancient continent formed during the Proterozoic about 2 billion years ago
  • Earth:Congo Craton – Precambrian craton that with four others makes up the modern continent of Africa (Angola, Cameroon, Central African Republic, Democratic Republic of Congo, Gabon, Sudan, and Zambia)
  • Earth:Kalahari Craton – African geological area (South Africa)
  • Earth:Saharan Metacraton – Large area of continental crust in the north-central part of Africa (Algeria)
  • Earth:Tanzania Craton – Old and stable part of the continental lithosphere in central Tanzania (Tanzania)
  • Earth:West African Craton – One of the five cratons of the Precambrian basement rock of Africa that make up the African Plate (Algeria, Benin, Burkina Faso, Côte d'Ivoire, Gambia, Ghana, Guinea, Guinea Bissau, Liberia, Mali, Mauritania, Morocco, Nigeria, Senegal, Sierra Leone, and Togo)
  • Zaire Craton (Congo)

Antarctic plate

Eurasian plate

  • Armorica – Microcontinent or group of continental fragments rifted away from Gondwana (France, Germany, Spain and Portugal)
  • Earth:Avalonia (Canada, Ireland, Great Britain, and United States)
  • Earth:Baltic plate – Ancient tectonic plate from the Cambrian to the Carboniferous Period
  • Belomorian Craton
  • Central Iberian plate
  • Cimmerian plate – Ancient string of microcontinents that rifted from Gondwana (Anatolia, Iran, Afghanistan, Tibet, Indochina and Malaya)
  • Earth:East European Craton – Geology of Europe
  • Place:Baltic Shield, also known as Fennoscandian Shield – Ancient segment of Earth's crust
  • Junggar plate – Geographical subregion in Northwest China and Eastern Kazakhstan
  • Earth:Kazakhstania – Geological region in Central Asia and the Junngar Basin in China
  • Earth:Lhasa terrane – Fragment of crustal material that forms present-day southern Tibet
  • Earth:Massif Central – A highland region in the middle of Southern France
  • Moravo Silesian plate
  • Earth:Midlands Microcraton – Block of late Neoproterozoic crust which underlies the English Midlands
  • Earth:North China Craton – Continental crustal block in China, Inner Mongolia, the Yellow Sea, and North Korea
  • Ossa-Morena plate
  • Piemont-Liguria plate – Former piece of oceanic crust that is seen as part of the Tethys Ocean
  • Proto-Alps terrane
  • Rhenohercynian plate – Fold belt of west and central Europe, formed during the Hercynian orogeny
  • Siberian Craton – Ancient craton forming the Central Siberian Plateau
  • South Portuguese plate
  • Tarim craton
  • Teplá-Barrandian terrane
  • Earth:Ukrainian Shield – The southwest shield of the East European craton
  • Valais plate – Subducted ocean basin. Remnants found in the Alps in the North Penninic nappes.
  • Volgo-Uralian craton
  • Yakutai craton
  • Yangtze Craton – An ancient continent that contained today's South and Southeast China, Indochina, and parts of Southeast Asia

Indo-Australian plate

Basic geological regions of Australia, by age
Map of chronostratigraphic divisions of India

North American plate

North American cratons and basement rocks
  • Earth:Avalonia (Canada, Ireland, Great Britain, and United States)
  • Earth:Churchill Craton – Northwest section of the Canadian Shield from southern Saskatchewan and Alberta to northern Nunavut (Canada)
  • Earth:Farallon plate – Ancient oceanic plate that has mostly subducted under the North American plate (split into the Cocos, Explorer, Juan de Fuca, Gorda plates, Nazca plate, and Rivera plates)
  • Earth:Hearne Craton – Craton in northern Canada (Canada)
  • Laurentian Craton, also known as North American Craton – A large continental craton that forms the ancient geological core of the North American continent (Canada and United States)
  • Earth:Insular plate – Ancient oceanic plate
  • Earth:Intermontane plate – Ancient oceanic tectonic plate on the west coast of North America about 195 million years ago
  • Earth:Izanagi plate – Ancient tectonic plate
  • Mexican plate
  • Earth:Nain Province – Part of the North Atlantic Craton in Labrador, Canada (Canada)
  • Newfoundland plate
  • Nova Scotia plate
  • Earth:Rae Craton – Archean craton in northern Canada north of the Superior Craton (Canada)
  • Sask Craton (Canada)
  • Earth:Sclavia Craton – Late Archean supercraton (Canada)
  • Earth:Slave Craton – Area of ancient rocks in northwest Canada (Canada)
  • Earth:Superior Craton – Large crustal block in North America (Canada)

South American plate

See also

Notes and references

Notes

  1. 15,600,000 km2 is the original size before the 2017 split of the Coiba and Malpelo plates.

References

  1. New Map Shows Earth’s Tectonic Plates In Unprecedented Detail
  2. Madaan, About Sonia (2020-08-18). "7 Major Tectonic Plates (Pacific, African, Eurasian, Antarctic and more)". How Many Tectonic Plates Are on Earth?. https://eartheclipse.com/geology/tectonic-plates.html#How_Many_Tectonic_Plates_Are_on_Earth. 
  3. Bird, P. (2003). "An updated digital model of plate boundaries". Geochemistry, Geophysics, Geosystems 4 (3): 1027. doi:10.1029/2001GC000252. http://peterbird.name/publications/2003_PB2002/2003_PB2002.htm.
  4. Hasterok, D., Halpin, J., Collins, A.S., Hand, M., Kreemer, C., Gard, M., and Glorie, S. (2022); New maps of global geological provinces and tectonic plates. Earth Science Reviews, 2022.
  5. van Dijk, J.P. (2023); The New Global Tectonic Map – Analyses and Implications. Terra Nova, 2023, 27 pp. doi:10.1111/TER.12662
  6. Niels Henriksen; A.K. Higgins; Feiko Kalsbeek; T. Christopher R. Pulvertaft (2000). "Greenland from Archaean to Quaternary". Greenland Survey Bulletin (185). http://www.geus.dk/publications/bull-gl/nr185/nr185_p12-24.pdf. 

Bibliography

North Andes plate




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