Fluvial-eolian deposits of the Tacuarembó formation (Norte Basin – Uruguay): Depositional models and stratigraphic succession

Amarante, Francyne Bochi do; Scherer, Claiton Marlon dos Santos; Aguilar, César Alejandro Goso; Reis, Adriano Domingos dos; Mesa, Valeria; Soto, Matías

doi:10.1016/j.jsames.2018.12.024

Cited by 33 publications

(19 citation statements)

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“…The study area is located along the southern margin of the Paraná Basin, in Rio Grande do Sul State (Brazil) and Central Uruguay. In Uruguay, the Botucatu Formation is equivalent to the Rivera Member of the Tacuarembó Formation (Amarante et al ., ). The Botucatu Formation also has equivalent units in Argentina (San Cristobal Formation), Paraguay (Missiones Formation), Bolivia (Ichoa Formation) and Namibia (Twyfelfontain Formation) (Scherer & Goldberg, ).…”

Section: Geological Contextmentioning

confidence: 97%

“…In the study area, the Botucatu Formation overlies three distinct units of the Gondwana I and II supersequences of the Paraná Basin‐fill: (i) the Jurassic Guará Formation and Batovi Member of Tacuarembó Formation (Uruguay) in the west; (ii) the Triassic Caturrita Formation in the central region; and (iii) the Permian to Jurassic Pirambóia Formation in the east. The Guará Formation (Batovi Member) is an Upper Jurassic fluvial–aeolian unit, comprising a south/south‐west directed distributive fluvial system and small to medium size dunes (Scherer & Lavina, ; Amarante et al ., ). The Triassic Caturrita Formation comprises amalgamated sandstones intercalated with siltstones that represent high energy, low sinuosity river deposits (Zerfass et al ., ; Jenisch et al ., ).…”

Section: Geological Contextmentioning

confidence: 97%

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Controls on Early Cretaceous desert sediment provenance in south‐west Gondwana, Botucatu Formation (Brazil and Uruguay)

et al. 2020

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The Lower Cretaceous Botucatu Formation records the development of widespread dry–aeolian desert sedimentation throughout the Paraná Basin in south‐west Gondwana. To reconstruct the provenance of the aeolian sediment, petrography, granulometric analysis, U‐Pb detrital zircon ages have been determined from along the southern basin margin in Rio Grande do Sul state (southern Brazil) and Uruguay (Tacuarembó region). The dataset reveals a mean composition Qt89F8L3, comprising very fine to medium‐grained quartozose and feldspatho‐quartzose framework. Heavy mineral analysis reveals an overall dominance of zircon, tourmaline and rutile grains (mean ZTR0.84) with sporadic garnet, epidote and pyrolusite occurrences. The detrital zircon U‐Pb ages are dominated by Cambrian to Neoproterozoic (515 to 650 Ma), Tonian to Stenian (900 to 1250 Ma) and Orosirian to Rhyacian (1.8 to 2.2 Ga) material. The detrital zircon dataset demonstrates a significant lateral variation in sediment provenance: Cambrian to Neoproterozoic detrital zircons dominate in the east, while Tonian to Stenian and Orosirian to Rhyacian ages predominate in the west of the study area. Sandstones are quartz‐rich with dominantly durable zircon, tourmaline and rutile heavy mineral suite, with subtle but statistically significant along‐strike differences in heavy mineral populations and detrital mineralogy which are thought to record local sediment input points into the aeolian system. The similar age spectra of Botucatu desert with proximal Paraná Basin units, the predominance of quartzose, and zircon, tourmaline and rutile components, suggests that recycling is the mechanism responsible for the erg feeding.

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Section: Geological Contextmentioning

confidence: 97%

Section: Geological Contextmentioning

confidence: 97%

Controls on Early Cretaceous desert sediment provenance in south‐west Gondwana, Botucatu Formation (Brazil and Uruguay)

et al. 2020

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“…1), is used as a field case study, because it comprises the preserved deposits of an ephemeral fluvial system with minor perennial influxes and interactions with deposits of an aeolian system. Comparisons can be drawn with modern dryland systems [for example, the Luni River (Carling & Leclair, 2019)], ancient systems [for example, the Tacuaremb o Formation (Amarante et al, 2019)] and the Kayenta can be considered analogous to several North Sea reservoirs [for example, the Leman Sandstone (Glennie & Provan, 1990)]. Consequently, the study has the potential to illustrate generic concepts in the understanding of ephemeral fluvio-aeolian systems.…”

Section: Introductionmentioning

confidence: 99%

The sedimentology of an ephemeral fluvial–aeolian succession

Priddy

Clarke

2020

Sedimentology

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Ephemeral fluvial systems are commonly associated with arid to semi‐arid climates. Although their complex sedimentology and depositional settings have been described in much detail, depositional models depicting detailed lateral and vertical relationships, and interactions with coeval depositional environments, are lacking compared to well‐recognized meandering and braided fluvial systems. This study critically evaluates the applicability of current models for ephemeral fluvial systems to an ancient arid fluvial example of the Lower Jurassic Kayenta Formation of the Colorado Plateau, USA. The study employs detailed sedimentary logging, palaeocurrent analysis and photogrammetric panels across the regional extent of the Kayenta. A generic model that accounts for the detailed sedimentology of a sandy arid ephemeral fluvial system (drawing upon both ancient and geomorphological studies) is developed, along with analysis of the spatial and temporal interactions with the aeolian setting. Results show that the ephemeral system is dominated by laterally and vertically amalgamated, poorly channelized to sheet‐like elements, with abundant upper flow regime flat beds and high sediment load structures formed between periods of lower flow regime conditions. Through interaction with a coeval aeolian system, most of the fluvial deposits are dominated by sand‐grade sediment, unlike many modern ephemeral fluvial systems that contain a high proportion of conglomeratic and/or finer grained mudstone and siltstone deposits. During dominantly fluvial deposition, high width to thickness ratios are observed for channelized and sheet‐like elements. However, with increasing aridity, the aeolian environment becomes dominant and fluvial deposition is restricted to interdune corridors, resulting in lower width to thickness ratio channels dominated by flash‐flood and debris‐flow facies. The data presented here, coupled with modern examples of ephemeral systems and flood regimes, suggest that ephemeral flow produces and preserves distinctive sedimentological traits that can not only be recognized in outcrops, but also within core.

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“…In the last years, different studies have identified Upper Jurassic fluvial-aeolian deposits in the southern portion of Paraná Basin, encompassed in the Guará (southern Brazil) and Tacuarembó (Uruguay) Formations Lavina, 2005, 2006;Perea et al, 2009;Reis, 2016;Amarante et al, 2019;Francischini et al 2015). These formations represent the distal portion of a big distributive fluvial system that flowed to the southwest (Amarante et al, 2019).…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

“…The Lower Cretaceous Botucatu Formation is considered a record of a palaeodesert that covered an area of more than 1,500,000 km² (Bigarella and Salamuni, 1961;Scherer and Goldberg, 2007), cropping out in the edges of Paraná Basin in Brazil, Uruguay, Argentina, Paraguay, and has correlative deposits in Namibia (e.g. Twyfelfontein Formation; Stanistreet and Stollhoffen, 1999; Fig.…”

Section: Geological Settingmentioning

confidence: 99%

Sedimentology of the proximal portion of a large-scale, Upper Jurassic fluvial-aeolian system in Paraná Basin, southwestern Gondwana

Reis

Scherer

Amarante

et al. 2019

Journal of South American Earth Sciences

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Fluvial-eolian deposits of the Tacuarembó formation (Norte Basin – Uruguay): Depositional models and stratigraphic succession

Cited by 33 publications

References 34 publications

Controls on Early Cretaceous desert sediment provenance in south‐west Gondwana, Botucatu Formation (Brazil and Uruguay)

Controls on Early Cretaceous desert sediment provenance in south‐west Gondwana, Botucatu Formation (Brazil and Uruguay)

The sedimentology of an ephemeral fluvial–aeolian succession

Sedimentology of the proximal portion of a large-scale, Upper Jurassic fluvial-aeolian system in Paraná Basin, southwestern Gondwana

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