The Araguaia Belt, Brazil: Part Of A Neoproterozoic Continental-Scale Strike-Slip Fault System

Journal of The Virtual Explorer Pub Date : 1900-01-01 DOI:10.3809/JVIRTEX.2004.00107

M. A. Fonseca, Claudinei Gouveia de Oliveira, H. Evangelista

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引用次数: 15

Abstract

The Araguaia Belt is part of the Tocantins Orogen, a Neoproterozoic orogen that formed during the collision between the Amazonia, Sao Francisco/Congo and West African Paleo-Continents. This collision contributed to the assembly of West Gondwana. We mapped parts of the Araguaia Belt in its south and central portions in northern Brazil. Our mapping suggests two phases of deformation. The first resulted in the development of N-S trending amphibolite-facies transpresssional structures with a reverse-sinistral movement with ver- gence towards the Amazonian Craton on the west. The age of this deformation phase is possibly Paleoproterozoic. The second phase generated N-S dextral strike-slip faults that cross-cut older structures. This phase was accompanied by retrograde metamorphism. We propose that these strike-slip faults connect with the east-west trending dextral strike-slip faults in the Borborema Orogen on the northern margin of the Sao Francisco Craton. Move- ment on faults fringing the Amazonian Craton combined with that of the Araguaia-Borbor- ema strike-slip system, accommodated lateral escape of terranes wedged between the Amazonian and Sao Francisco-Congo Cratons during the Neoproterozoic. http://virtualexplorer.com.au/

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巴西阿拉瓜亚带:新元古代大陆尺度走滑断裂系统的一部分

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Journal of The Virtual Explorer

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