A proveniência dos sedimentos e cinzas vulcânicas dos sedimentos permianos da bacia do Paraná : implicações para a história geológica do sul-sudoeste de Gondwana

Content Provider	Semantic Scholar
Author	Costa, Lindaray Sousa Da
Copyright Year	2016
Abstract	The southwestern margin of Gondwana was marked by major tectonic and environmental changes during the Permian, such as the development of a major subduction and accretion zone along the Southern Panthalassan margin. This event may have affected drainage pattern and sediment source areas in southwestern Gondwana intracratonic basins, such as the Paraná basin. The Serra do Rio do Rastro, southeastern Brazil, features outcrops of a Permian succession of sedimentary rocks that may have recorded these tectonic changes that affected southwestern Gondwana. We present U-Pb and Lu-Hf detrital zircon data and whole rock Sm-Nd isotope data from samples across this succession, known as the White Column after an American geologist that studied these rocks in the last century. The zircon U-Pb data from the lower to middle part of the Permian (Rio Bonito Formation Grupo Guatá Group) indicate a dominance of Palaeoproterozoic (2.5 to 1.7 Ga) grains, followed by Mesoproterozoic (1.5 to 1.0 Ga) and Neoproterozoic (992 to 550 Ma) grains. In contrast, the sediments from the Rio Rasto Formation (Passa Dois Group) present a dominance of Neoproterozoic (935 to 545 Ma) grains, followed by Palaeozoic, including Permo-
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://repositorio.unb.br/bitstream/10482/21000/1/2016_LindaraySousadaCosta.pdf
Alternate Webpage(s)	https://doi.org/10.26512/2016.01.T.21000
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article