The Ordovician-Silurian tectono-stratigraphic evolution and paleogeography of eastern Parnaiba Basin, NE Brazil

Assis, André Pereira de; Porto, Amanda; Schmitt, Renata da Silva; Linol, Bastien; Medeiros, Sílvia Regina de; Martins, F. Correa; Silva, D.S.

doi:10.1016/j.jsames.2019.102241

Cited by 17 publications

(19 citation statements)

References 45 publications

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“…Time and cost are respectively represented by one to three clock faces ( ) and dollar signs ($), from lower to higher values. Assis et al, 2019;Barrera et al, 2020;Fig. 2).…”

Section: Study Areasmentioning

confidence: 99%

“…The Agisoft Metashape (former PhotoScan; Agisoft, 2019) is one such software commonly used in virtual outcrop workflows (e.g. Tavani et al, 2014;Viana et al, 2016;Barbasiewicz et al, 2018) because of its high-quality results and low-cost academic licenses. For discussions on advantages and disadvantages of different SfM-MVS-based software the reader is referred to Micheletti et al (2015), Smith et al (2016), Schwind & Starek (2017), Barbasiewicz et al (2018) and Fleming & Pavlis (2018).…”

Section: Processing Of Virtual Outcropsmentioning

confidence: 99%

“…Location of studied outcrops (A) – Parnaíba (B) and Tucano (C) basins in Brazil. (B) Geological sketch map of the north‐eastern part of the Parnaíba Basin (after Assis et al., 2019) with positions of outcrops PC01, PC02, PC03, LL01 and LL02 (for coordinates, see Files to ). Sketch map scale does not permit representation of the lithostratigraphic units exposed at each outcrop.…”

Section: Study Areasmentioning

confidence: 99%

“…The studied deposits represent the Ordovician to Silurian Serra Grande Group, the basal succession in north‐eastern Parnaíba Basin, and the Early Cretaceous São Sebastião and Marizal formations in the Tucano Basin. The <200 m thick Serra Grande Group is subdivided, from base to top, into the glacio‐fluvial Ipu Formation, the transgressive Tianguá Formation and the fluvial Jaicós Formation (Caputo & Lima, 1984; Vaz et al., 2007; Assis et al., 2019; Barrera et al., 2020; Fig. 2).…”

Section: Study Areasmentioning

confidence: 99%

“…Tavani et al, 2014;Viana et al, 2016;Barbasiewicz et al, 2018) because of its high-quality results and low-cost academic licenses. For discussions on advantages and disadvantages of different SfM-MVS-based software the reader is referred to Micheletti et al (2015), Smith et al (2016), Schwind & Starek (2017), Barbasiewicz et al (2018) and Fleming & Pavlis (2018). For details of the processes and algorithms involved in the construction of 3D digital models, the reader is referred to Brown & Lowe (2005); James & Robson (2012) and Viana et al (2018).…”

Section: Processing Of Virtual Outcropsmentioning

confidence: 99%

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Cross‐strata palaeocurrent analysis using virtual outcrops

et al. 2021

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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.

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“…Time and cost are respectively represented by one to three clock faces ( ) and dollar signs ($), from lower to higher values. Assis et al, 2019;Barrera et al, 2020;Fig. 2).…”

Section: Study Areasmentioning

confidence: 99%