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Cratons of South America and Africa during the Triassic Period when the two continents were joined as part of the Pangea supercontinent. A craton (/ ˈ k r eɪ t ɒ n / KRAYT-on, / ˈ k r æ t ɒ n / KRAT-on, or / ˈ k r eɪ t ən / KRAY-tən; [1] [2] [3] from Greek: κράτος kratos "strength") is an old and stable part of the continental lithosphere, which consists of Earth's two topmost ...
Guiana Shield. Guaporé or Central Brazilian Shield. The Angaran Shield of West Siberia. Arabian-Nubian Shield. (Western) Australian Shield. Baltic Shield of Scandinavia and Eastern Europe. Canadian Shield a.k.a. Laurentian Shield. The China-Korean Shield containing the North China Craton.
The North American Craton, also called Laurentia. The Wyoming Craton is a craton in the west-central United States and western Canada – more specifically, in Montana, Wyoming, southern Alberta, southern Saskatchewan, and parts of northern Utah. Also called the Wyoming Province, it is the initial core of the continental crust of North America.
The West African Craton (WAC) is one of the five cratons of the Precambrian basement rock of Africa that make up the African Plate, the others being the Kalahari craton, Congo craton, Saharan Metacraton and Tanzania Craton. [1] Cratons themselves are tectonically inactive, but can occur near active margins, [2] with the WAC extending across 14 ...
East European Craton. The East European Craton (EEC) is the core of the Baltica proto- plate and consists of three crustal regions/segments: Fennoscandia to the northwest, Volgo-Uralia to the east, and Sarmatia to the south. Fennoscandia includes the Baltic Shield (also referred to as the Fennoscandian Shield) and has a diversified accretionary ...
The collision of the 2 cratons first thickened the crust by folding. [32] Eclogite formed in the lower crust, which made the lower crust denser. [32] New shear zones also developed in the lower crust. [32] The asthenosphere convected and seeped into weak points developed in the lower crust shear zones. [32]
The Superior Craton is a stable crustal block covering Quebec, Ontario, and southeast Manitoba in Canada, and northern Minnesota in the United States. It is the biggest craton among those formed during the Archean period. [1] A craton is a large part of the Earth's crust that has been stable and subjected to very little geological changes over ...
The Amazonian Craton is a geologic province located in South America. It occupies a large portion of the central, north and eastern part of the continent and represents one of Earth's largest cratonic regions. [1] The Guiana Shield and Central Brazil Shield (Guaporé Shield) constitute respectively the northern and southern exhumed parts of the ...