Variability of fluvial architecture in a poorly vegetated Earth: Silurian sheet-braided and meandering ancestor river deposits recorded in northeastern Brazil

Autor(es)

Janikian, Liliane ^[1] ; de Almeida, Renato Paes ^[2] ; Galeazzi, Cristiano Padalino ^[2] ; Tamura, Larissa Natsumi ^[2] ; Ardito, Julio Cesar ^[2] ; Carrari Chamani, Marley Antonio ^[2]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Paulo, Inst Mar, Santos, SP - Brazil

^[2] Univ Sao Paulo, Inst Geociencias, Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: TERRA NOVA; v. 32, n. 3 DEC 2019.
• Citações Web of Science: 0

Resumo

Rivers with little to no influence of vegetation and their implications for the architecture of Early Paleozoic and Precambrian fluvial deposits are an important topic of investigation for both clastic sedimentology and Earth System evolution perspectives. Despite the long-held concept of a dominant style of wide, shallow sheet-braided sandy channels, growing evidence for a great variability of architectural elements in pre-vegetation settings point to the predictable occurrence of other fluvial styles, which are possibly related to areas of low-slope alluvial plains. The present work brings sedimentological descriptions and fluvial style interpretations of Silurian fluvial successions of the Serra Grande Group in northeastern Brazil, developed in a glaciated basin margin (therefore with little to no effect of vegetation). The comparison of the resulting channel body architectures integrated to paleocurrent data and a diffusion-based numerical model enabled the evaluation of the controls on fluvial architecture variability in unvegetated alluvial plains. (AU)

• Processo FAPESP: 17/06874-3 - Dinâmica fluvial e depósitos sedimentares no Rio Amazonas: providenciando ferramentas para decifrar a evolução paleogeográfica da Amazônia e depósitos de grandes rios no registro rochoso
• Beneficiário: Cristiano Padalino Galeazzi
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 16/03091-5 - Caracterização das heterogeneidades e modelagem de análogos de reservatórios em depósitos fluviais e eólicos
• Beneficiário: Liliane Janikian Paes de Almeida
• Modalidade de apoio: Auxílio à Pesquisa - Regular