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• W2067246586 abstract "A 1000-km-long positive gravity anomaly occupies the axis of the Amazon Basin and has been taken to indicate the presence of an underlying intracontinental rift. The oldest known sediments in the basin form the Trombetas formation of Late Ordovician and Silurian age (450 to 410 Ma). This unit can be interpreted as a product of thermal subsidence, suggesting that the underlying rift may have originated in Cambrian time (about 510 Ma). Overlying younger sediments and intrusives in the basin reveal a history that can be linked to the Phanerozoic evolution of the Andes and include a Devonian sequence (about 390 Ma), perhaps related to a Patagonian collision, and a thick Carbo-Permian sequence (320 to 260 Ma) deposited at the time of collision between Gondwanaland and Laurentia. Renewed rifting and a thick sedimentary sequence near the Amazon mouth records the opening of the South Atlantic at about 130 Ma and later South Atlantic continental margin history. We suggest that the Sub-Amazonal Rift originated as a result of continental collision along the margin of the West African Craton. The West African Craton was involved in arc and continental collisions along its entire periphery during latest Precambrian and Cambrian times between 700 and 500 Ma. This activity culminated latest and was most intense in an area near the site of the present mouth of the Amazon River, where the suture zone marking final continental collision is cryptic for a distance of 1500 km between Ghana and Sierra Leone. This cryptic suture zone includes the entire Sao Luis province boundary in Brazil. The coincidence in time between rift formation and continental collision, location of the rift at the site of the most intense tectonism, and its trend at a high angle to the collisional suture zone lead us to conclude that the Sub-Amazonal Rift originated as a result of the Pan-African collision. This conclusion adds one more to the growing list of intracontinental rift systems that have been attributed to local modification of within-plate stress as a result of continental collision. Rifts of this origin, which have been called impactogens, include those of the active Rhine, Baikal, and Shanxi systems, as well as those of the 1.0 Ga Mid-Continental rift system of North America." @default.
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• W2067246586 date "1993-10-01" @default.
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• W2067246586 title "Origin of the Rift Under the Amazon Basin as a Result of Continental Collision During Pan- African Time" @default.
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• W2067246586 doi "https://doi.org/10.1080/00206819309465563" @default.
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