Neoproterozoic sedimentary deposits of the Tucuruí Group – Araguaia Belt, Northestern of Pará state
The Tucuruí Group of Neoproterozoic age outcrops in Tucuruí region, northeastern of Pará state, along with the transition between the Amazonian Craton and Araguaia Belt. The group is defined by a volcano-sedimentary sequence containing basaltic flows and diabase sill intrusions interbedded with si...
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doaj-8414121457d54f03bdda47fce11b0fed2020-11-25T03:01:07ZengUniversidade de São PauloGeologia USP. Série Científica1519-874X1519-874X2014-03-01141213610.5327/Z1519-874X201400010002Neoproterozoic sedimentary deposits of the Tucuruí Group – Araguaia Belt, Northestern of Pará state Alessandra de Cássia dos Santos Dutra0Paulo Sergio de Sousa Gorayeb1Afonso César Rodrigues Nogueira2Programa de Pós-graduação em Geologia e Geoquímica, Instituto de Geociências, Universidade Federal do Pará - UFPA, Belém, PA, BRPrograma de Pós-graduação em Geologia e Geoquímica, Instituto de Geociências, Universidade Federal do Pará - UFPA, Belém, PA, BRPrograma de Pós-graduação em Geologia e Geoquímica, Instituto de Geociências, Universidade Federal do Pará - UFPA, Belém, PA, BRThe Tucuruí Group of Neoproterozoic age outcrops in Tucuruí region, northeastern of Pará state, along with the transition between the Amazonian Craton and Araguaia Belt. The group is defined by a volcano-sedimentary sequence containing basaltic flows and diabase sill intrusions interbedded with siliciclastics deposits. The Tucuruí thrust fault override these sets rocky westward resulting in shearing, fracturing and fluid percolation in these rocks. The siliciclastic deposits consist of amalgamated subarkoses and siltstones, whose layers are oriented NNE-SSW direction with low dip to SE. In addition presenting coarsening and thickening upward. In this investigation were recognized two sedimentary facies associations: Deposits of Shoreface and Coastal Tempestites Face. This association suggests easy transport processes and sedimentation linked to a shallow marine environment, following the foreshore zone to zone shoreface under influence of wave storm. The petrographic analysis revealed the compositional and textural immaturity of arkosean sandstone and siltstone indicating nearby source area of provenance of mafic to intermediate igneous rocks. The sequence was subject to the mesodiagenetic sedimentary conditions. Thus, the siliciclastic deposits of Tucuruí Group represent the portion of a preserved segment influenced by coastal storm waves in a rift basin or foreland with nearby source area, composed of igneous rocks with strong relief, and marked predominantly by physical weathering. Basaltic volcanic flows occurred during the evolution of this basin.http://ppegeo.igc.usp.br/pdf/guspsc/v14n1/a02v14n1.pdfSedimentary environmentsTucuruí GroupNeoproterozoicAraguaia Belt |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Alessandra de Cássia dos Santos Dutra Paulo Sergio de Sousa Gorayeb Afonso César Rodrigues Nogueira |
spellingShingle |
Alessandra de Cássia dos Santos Dutra Paulo Sergio de Sousa Gorayeb Afonso César Rodrigues Nogueira Neoproterozoic sedimentary deposits of the Tucuruí Group – Araguaia Belt, Northestern of Pará state Geologia USP. Série Científica Sedimentary environments Tucuruí Group Neoproterozoic Araguaia Belt |
author_facet |
Alessandra de Cássia dos Santos Dutra Paulo Sergio de Sousa Gorayeb Afonso César Rodrigues Nogueira |
author_sort |
Alessandra de Cássia dos Santos Dutra |
title |
Neoproterozoic sedimentary deposits of the Tucuruí Group – Araguaia Belt, Northestern of Pará state |
title_short |
Neoproterozoic sedimentary deposits of the Tucuruí Group – Araguaia Belt, Northestern of Pará state |
title_full |
Neoproterozoic sedimentary deposits of the Tucuruí Group – Araguaia Belt, Northestern of Pará state |
title_fullStr |
Neoproterozoic sedimentary deposits of the Tucuruí Group – Araguaia Belt, Northestern of Pará state |
title_full_unstemmed |
Neoproterozoic sedimentary deposits of the Tucuruí Group – Araguaia Belt, Northestern of Pará state |
title_sort |
neoproterozoic sedimentary deposits of the tucuruí group – araguaia belt, northestern of pará state |
publisher |
Universidade de São Paulo |
series |
Geologia USP. Série Científica |
issn |
1519-874X 1519-874X |
publishDate |
2014-03-01 |
description |
The Tucuruí Group of Neoproterozoic age outcrops in Tucuruí region, northeastern of Pará state, along with the transition
between the Amazonian Craton and Araguaia Belt. The group is defined by a volcano-sedimentary sequence containing
basaltic flows and diabase sill intrusions interbedded with siliciclastics deposits. The Tucuruí thrust fault override these
sets rocky westward resulting in shearing, fracturing and fluid percolation in these rocks. The siliciclastic deposits consist
of amalgamated subarkoses and siltstones, whose layers are oriented NNE-SSW direction with low dip to SE. In addition
presenting coarsening and thickening upward. In this investigation were recognized two sedimentary facies associations:
Deposits of Shoreface and Coastal Tempestites Face. This association suggests easy transport processes and sedimentation linked to a shallow marine environment, following the foreshore zone to zone shoreface under influence of wave storm. The petrographic analysis revealed the compositional and textural immaturity of arkosean sandstone and siltstone indicating
nearby source area of provenance of mafic to intermediate igneous rocks. The sequence was subject to the mesodiagenetic
sedimentary conditions. Thus, the siliciclastic deposits of Tucuruí Group represent the portion of a preserved segment influenced by coastal storm waves in a rift basin or foreland with nearby source area, composed of igneous rocks with strong relief, and marked predominantly by physical weathering. Basaltic volcanic flows occurred during the evolution of this basin. |
topic |
Sedimentary environments Tucuruí Group Neoproterozoic Araguaia Belt |
url |
http://ppegeo.igc.usp.br/pdf/guspsc/v14n1/a02v14n1.pdf |
work_keys_str_mv |
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