Mesoproterozoic erg and sand sheet system: Architecture and controlling factors (Galho do Miguel Formation, SE Brazil)

Abrantes, Francisco R.; Basílici, Giorgio; Soares, Marcus Vinícius Theodoro

doi:10.1016/j.precamres.2019.105592

Cited by 13 publications

(8 citation statements)

References 65 publications

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“…However, the zigzag patterns and compound sets of cross-stratification preserved in the Navajo Sandstone in the Zion and Arches regions (Figs. 2c and 3c) resemble the features of longitudinal dunes in other aeolian dune strata (Scherer, 2000;Abrantes et al, 2020). In addition, GPR observations of modern sinuous unidirectional dunes (Fu et al, 2019) indicate bidirectional but relatively thin cross-bed structures compared with those of longitudinal dunes (Bristow et al, 2000(Bristow et al, , 2007Zhou et al, 2012;Telfer and Hesse, 2013;Liu and Baas, 2020).…”

Section: Development Of Nne-ssw-to Nnw-sse-oriented Longitudinal Dunesmentioning

confidence: 75%

Development of longitudinal dunes under Pangaean atmospheric circulation

Shozaki

Hasegawa²

2022

Clim. Past

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Abstract. As a result of the large difference in heat capacity between land and ocean, global climate and atmospheric circulation patterns over the supercontinent of Pangaea were significantly different from those of today. Modelling experiments indicate a seasonal alternation in cross-equatorial flow induced by the seasonal reversal in the direction of the monsoonal circulation; however, there are large discrepancies between model-generated surface wind patterns and the reported palaeowind directions from aeolian dune records. Here, we present the spatial distribution of dune slip-face azimuths recorded in the Lower Jurassic aeolian sandstones over a wide area of the western United States (palaeolatitude: ∼19–27∘ N). The azimuth data for dune slip faces reveal a bidirectional and oblique angular pattern that resembles the internal structures of modern longitudinal dunes. Based on the spatial pattern of slip-face directions and outcrop evidence, we suggest that most Lower Jurassic aeolian sandstones were NNE–SSW- to NNW–SSE-oriented longitudinal dunes, which likely formed as the result of a combination of westerly, northwesterly, and northeasterly palaeowinds. The reconstructed palaeowind pattern at ∼19–27∘ N appears to be consistent with the model-generated surface wind pattern and its seasonal alternation. The reconstructed palaeowind patterns also suggest an influence of orbitally induced changes in atmospheric pressure patterns over Pangaea.

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Section: Development Of Nne-ssw-to Nnw-sse-oriented Longitudinal Dunesmentioning

confidence: 75%

Development of longitudinal dunes under Pangaean atmospheric circulation

Shozaki

Hasegawa²

2022

Clim. Past

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“…From the Mesoproterozoic, continental systems appeared with characteristics similar to those developed from the Phanerozoic to the present time: for instance, large aeolian systems (ergs) are recorded from the end of the Palaeoproterozoic (2.0-1.8 Ga) (Eriksson et al, 2005;Simpson et al, 2013;Abrantes et al, 2020), and high-sinuosity rivers, some with well-developed floodplains, seem to have been present (Ielpi, 2017(Ielpi, , 2018Santos et al 2017;Ielpi et al, 2018).…”

Section: Introductionmentioning

confidence: 84%

Microbial influence on the accumulation of Precambrian aeolian deposits (Neoproterozoic, Venkatpur Sandstone Formation, Southern India)

Basílici

Soares

Mountney

et al. 2020

Precambrian Research

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“…Low-grade metamorphism transformed the original quartzarenites of Galho do Miguel Formation into metaquartzarenite. Cross-stratified sets, 0.1 to 6 m thick, and planar parallel stratification sets, 0.1 to 6.5 m thick, are peculiar characteristics of this unit (Abrantes et al, 2020;Mesquita et al, 2021). The base of the unit is composed of marine deposits that are transgressive on the Sopa Brumadinho Formation (Dossin et al 1987;Santos et al 2013); the top is overlain by coastal and marine deposits (Conseilheiro Mata Group) (Santos et al, 2015).…”

Section: Geological Settingmentioning

confidence: 99%

“…The base of the unit is composed of marine deposits that are transgressive on the Sopa Brumadinho Formation (Dossin et al 1987;Santos et al 2013); the top is overlain by coastal and marine deposits (Conseilheiro Mata Group) (Santos et al, 2015). Based on detailed sedimentological study (Abrantes et al, 2020;Mesquita et al, 2021) the Galho do Miguel Formation was interpreted as the preserved record of a complex aeolian system, characterised by megadunes (draas), simples dunes and sand sheets subjected to climate-driven water-table variations, which caused temporal alternations of aeolian dune fields (ergs) and sands sheets. Based on dip-azimuth measurements of isolated transverse dune foresets, a general palaeowind direction towards E-NE has been tentatively inferred (Abrantes et al, 2020;Mesquita et al, 2021).…”

Section: Geological Settingmentioning

confidence: 99%