Cross-strata palaeocurrent analysis using virtual outcrops

Autor: Larissa Natsumi Tamura, Renato Paes de Almeida, Bernardo Tavares Freitas, Cristiano Padalino Galeazzi, Felipe Torres Figueiredo, Mario Luis Assine, Leonardo Henrique Silva, Liliane Janikian, Heitor G. Figueiredo
Přispěvatelé: Universidade Estadual de Campinas (UNICAMP), Universidade de São Paulo (USP), São Paulo Federal University, Universidade Federal de Sergipe (UFS), Universidade Estadual Paulista (Unesp)
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: Scopus
Repositório Institucional da UNESP
Universidade Estadual Paulista (UNESP)
instacron:UNESP
Popis: Made available in DSpace on 2021-06-25T10:57:53Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-01-01 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. Geology Lab School of Technology University of Campinas, Rua Paschoal Marmo, 1888, Jardim Nova Itália Institute of Geosciences University of São Paulo, Rua do Lago, 562, Cidade Universitária Institute of Marine Science São Paulo Federal University, Rua Carvalho de Mendonça, 144, Encruzilhada Departamento de Geologia (DGEOL) / Programa de Pós-graduação em Geociências e Análise de Bacias Universidade Federal de Sergipe, Marechal Rondon Ave., Geology Bldg., Multi-user Complex, Rosa Elze Departamento de Geologia Aplicada Instituto de Geociências e Ciências Exatas Universidade Estadual Paulista/UNESP, Avenida 24-A, Bela Vista, 178 Departamento de Geologia Aplicada Instituto de Geociências e Ciências Exatas Universidade Estadual Paulista/UNESP, Avenida 24-A, Bela Vista, 178
Databáze: OpenAIRE
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