Amazonia Craton
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The Amazonia Craton is a significant geological feature in South America, representing a core part of the continent's Precambrian foundation. It is one of five major cratons that form the ancient heart of South America, with rocks dating back to the Archean Eon, some as old as 3.4 billion years.12
The Amazonia Craton was shaped by two major Precambrian cycles of crustal deformation: the Trans-Amazonian cycle (approximately 2.2 to 1.8 billion years ago) and the Brazilian cycle (about 900 to 570 million years ago). These cycles involved the amalgamation and dispersal of continental crust, contributing to the formation of supercontinents like Gondwana and Pangea. The craton's geological history includes the development of mountain chains, the deposition of sedimentary rocks, and the emplacement of igneous intrusions.12
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South AmericaThe Precambrianā¦old) are known in the Amazonia, Luis Alves, and SĆ£o Francisco cratons, although precisely dated rock samples are scarce. Ages older than 3 billion years have been reported in the Imataca Complex of Venezuela and in the Xingu area of Brazil, both in the Amazonia craton. The oldest rocks foundā¦
Read Moreā¦old) are known in the Amazonia, Luis Alves, and SĆ£o Francisco cratons, although precisely dated rock samples are scarce. Ages older than 3 billion years have been reported in the Imataca Complex of Venezuela and in the Xingu area of Brazil, both in the Amazonia craton. The oldest rocks foundā¦
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Andes MountainsGeologyā¦as sediments eroded from the Amazonia craton (or Brazilian shield)āthe ancient granitic continental fragment that constitutes much of Brazilāand deposited between about 450 and 250 million years ago on the cratonās western flank. The weight of these deposits forced a subsidence (downwarping) of the crust, and the resulting pressure andā¦
Read Moreā¦as sediments eroded from the Amazonia craton (or Brazilian shield)āthe ancient granitic continental fragment that constitutes much of Brazilāand deposited between about 450 and 250 million years ago on the cratonās western flank. The weight of these deposits forced a subsidence (downwarping) of the crust, and the resulting pressure andā¦
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