The Cariri Velhos belt is a belt of rocks in Brazil that were deformed and metamorphosed in the Early Neoproterozoic. The belt runs from the Atlantic more than 700 kilometres (430 mi) inland in a SWW direction. The width of the belt varies from 100 to 50 kilometres (62 to 31 mi).
The Cariri Velhos belt lies intercalated in a mosaic with various Brasiliano cycle belts in the Borborema Province, a geologic province in Northeastern Brazil. The belt includes a series of orthogneisses, metavolcanic and metasedimentary rocks. It is not known if the plate tectonic events that led to the formation of the belts are related to the assembly of the supercontinent Rodinia.
References
- ^ dos Santos, Edilton José; Van Schmus, William Randall; Kozuch, Marianne; de Brito Neves, Benjamim Bley (2010). "The Cariris Velhos tectonic event in Northeast Brazil". Journal of South American Earth Sciences. 29 (1): 61–76. Bibcode:2010JSAES..29...61D. doi:10.1016/j.jsames.2009.07.003.
- Pinho Guimarães, Ignez; Van Schmus, William R.; de Brito Neves, Benjamin B.; Bretas Bittar, Sheila M.; Silva Filho, Adejardo F.; Armstrong, Richard (2012). "U–Pb zircon ages of orthogneisses and supracrustal rocks of the Cariris Velhos belt: Onset of Neoproterozoic rifting in the Borborema Province, NE Brazil". Precambrian Research. 192–195: 192–195. Bibcode:2012PreR..192...52G. doi:10.1016/j.precamres.2011.10.008.
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| Volcanism |
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