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In geology, a supercontinent is the assembly of most or all of Earth's continental blocks or cratons to form a single large landmass. [ 1 ] [ 2 ] [ 3 ] However, some geologists use a different definition, "a grouping of formerly dispersed continents", which leaves room for interpretation and is easier to apply to Precambrian times. [ 4 ]
The supercontinent cycle is the quasi-periodic aggregation and dispersal of Earth's continental crust. There are varying opinions as to whether the amount of continental crust is increasing, decreasing, or staying about the same, but it is agreed that the Earth's crust is constantly being reconfigured.
The supercontinent Columbia about 1.6 billion years ago Columbia , also known as Nuna or Hudsonland , is a hypothetical ancient supercontinent . It was first proposed by John J.W. Rogers and M. Santosh in 2002 [ 1 ] and is thought to have existed approximately 2,500 to 1,500 million years ago (Ma), in the Paleoproterozoic era.
Pangaea is the most recent supercontinent reconstructed from the geologic record and therefore is by far the best understood. The formation of supercontinents and their breakup appears to be cyclical through Earth's history.
Rodinia formed at c. 1.23 Ga by accretion and collision of fragments produced by breakup of an older supercontinent, Columbia, assembled by global-scale 2.0–1.8 Ga collisional events. [7] Rodinia broke up in the Neoproterozoic, with its continental fragments reassembled to form Pannotia 633–573 Ma.
The first concept of the Nena supercontinent originated with the southern regions of proto-Laurentia and the western regions proto-Baltica merging throughout the Proterozoic eon. [3] This concept would eventually be developed to the modern day conceptualization of the Nena supercontinent which includes additions of the Angara, Antarctica, and ...
Supercontinent cycle This page was last edited on 11 June 2022, at 07:42 (UTC). Text is ... This page was last edited on 11 June 2022, at 07:42 (UTC).
Amasia, 100 million years in the future [citation needed]. Amasia is a possible future supercontinent which could be formed by the merger of Asia and the Americas.The prediction relies mostly on the fact that the Pacific plate is already subducting under Eurasia and the Americas, a process which if continued will eventually cause the Pacific to close. [1]