Cross-strata palaeocurrent analysis using virtual outcrops

Autor(es)

Freitas, Bernardo T. ^[1] ; Silva, Leonardo H. G. ^[1] ; Almeida, Renato P. ^[2] ; Galeazzi, Cristiano P. ^[2] ; Figueiredo, Heitor G. ^[2] ; Tamura, Larissa N. ^[2] ; Janikian, Liliane ^[3] ; Figueiredo, Felipe T. ^[4] ; Assine, Mario L. ^[5]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Sch Technol, Geol Lab, Rua Paschoal Marmo 1888, BR-13484332 Limeira, SP - Brazil

^[2] Univ Sao Paulo, Inst Geosci, Rua Lago 562, Cidade Univ, BR-05508080 Sao Paulo, SP - Brazil

^[3] Sao Paulo Fed Univ, Inst Marine Sci, Rua Carvalho Mendonca 144, BR-11070100 Santos, SP - Brazil

^[4] Univ Fed Sergipe, Programa Posgrad Geociencias & Anal Bacias, Dept Geol DGEOL, Marechal Rondon Ave, Geol Bldg, Multiuser Complex, BR-49100000 Sao Cristavelo, SE - Brazil

^[5] Univ Estadual Paulista UNESP, Inst Geociencias & Ciencias Exatas, Dept Geol Aplicada, Ave 24-A, Bela Vista 178, BR-13506900 Rio Claro, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SEDIMENTOLOGY; v. 68, n. 6, p. 2397-2421, OCT 2021.
• Citações Web of Science: 1

Resumo

Although virtual outcrops or digital outcrop model applications in geological studies are becoming increasingly common, virtually no attention has been given to acquisition of palaeocurrent data from cross-strata. Palaeocurrent indicators are abundant in the sedimentary record, mainly as cross-strata, and present compelling implications for basin analysis, plate tectonics and palaeoenvironmental reconstructions, as well as for sediment transport systems. Palaeocurrents from cross-strata also comprise a quantifiable parameter in sedimentary successions that can be used in quantitative modelling of depositional architecture with implications for reservoir characterization through outcrop analogue studies. A common obstacle in obtaining large cross-strata orientation datasets is the limited access to steep and high outcrop faces, as well as financial and time restrictions on field work. To overcome these issues, the simplest workflow for drone-based acquisition, photogrammetric processing and analysis of virtual outcrops aiming at the attainment of palaeocurrent data from cross-strata is appraised here. The results show that orientations of cross-beds measured on virtual outcrops, with and without ground control points, and using two different levels of resolution downsampling, are comparable to field measurements using analogue and electronic devices. Time and financial resources can thus be saved by using the straightforward method presented here to supplement palaeocurrent mapping across wide areas and distinct stratigraphic intervals. (AU)

• 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
• Processo FAPESP: 14/00519-9 - Centralidades do lazer noturno na cidade de São Carlos-SP e as relações de interface
• Beneficiário: Tiago Ferreira Lopes Machado
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 16/19736-5 - Abordagens quantitativas de depósitos fluviais de grande porte: geologia de campo integrada a modelos 3D de afloramentos obtidos por fotogrametria
• Beneficiário: Bernardo Tavares Freitas
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• 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