First occurrence of charophyte algae from a Triassic Paleolake in Argentina and their paleoenvironmental context

Benavente, Cecilia Andrea; Mancuso, Adriana Cecilia; Cabaleri, Nora Graciela

doi:10.1016/j.palaeo.2012.09.016

Cited by 14 publications

(7 citation statements)

References 47 publications

(71 reference statements)

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“…These alternating conditions are characteristic of palustrine/wetland systems that are seasonally flooded and seasonally exposed to vadose eodiagenesis and/or pedogenesis substrates (Platt and Wright, 1992;Verrecchia, 2007;Alonso-Zarza and Wright, 2009). This interpretation differs from previous work that suggested lacustrine and shallow lacustrine environments (López-Gamundí and Astini, 2004;Mancuso, 2009;Benavente et al, 2012) for this facies association and agrees with the recent interpretation by Benavente et al (2015), who characterized palustrine carbonates for this succession.…”

Section: Palustrine Facies Associationsupporting

confidence: 87%

“…From a historical viewpoint, they help understand the evolution of the western margin of Gondwana during its breakup (Uliana and Biddle, 1988;Ramos and Kay, 1991;Charrier et al, 2007). Although limited work has been published on the stratigraphy and paleoenvironments within this back-arc trending rifts (Kokogián and Mancilla, 1989;Kokogián et al, 1993;López-Gamundí and Astini, 2004;Barredo and Ramos, 2010), paleontological work (Spalletti, 1999;Stipanicic, 2002;Benavente et al, 2012) and recent radiometric dating (Ávila et al, 2006;Spalletti et al, 2008;Mancuso et al, 2010;Barredo et al, 2012) have allowed reasonable time-space framework and stratigraphic correlations to be carried out (Spalletti, 1999;Benavente et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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Source-to-sink analysis of continental rift sedimentation: Triassic Cuyo basin, Precordillera Argentina

Teixeira

Astini

Gómez

et al. 2018

Sedimentary Geology

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The northernmost outcrops of the Triassic extensional Cuyo basin in western Argentina reveal a basal coarse conglomerate overlain by a thinning-fining upward siliciclastic red-bedded section with subordinated tuffs and microbial-rich carbonates (Cerro Puntudo Formation), unconformably covered by a second coarse conglomerate (El Relincho Formation), which were previously interpreted as two rifting events. An integrated analysis of facies associations, stacking patterns, paleocurrent and provenance was carried out in order to reveal the rift sedimentation using a source-to-sink approach. Besides the traditional controls in continental basins (e.g., sedimentation, tectonics and climate), this study considers possible drainage pattern evolution in order to differentiate isolated versus integrated depocenter stages. U-Pb zircon data corroborate our analysis and reveal a volcanic basement source of 256.8 ± 3.5 Ma (Permian/Lopingian) and a sedimentation age of 249.8 ± 2.5 Ma (Early Triassic) for a tuff interbedded within the Cerro Puntudo Formation, complementing previous age of 243.8 ± 1.9 Ma (Middle Triassic) at the top of this unit. Stratigraphic stacking allows the interpretation of three evolutionary stages. A first stage, represented by thick massive boulder-volcanic-rich conglomerates characterizing alluvial fan deposition, indicates strong tectonic activity of border faults (first rifting event). These features suggest high surface gradient and high available space controlling accommodation and dispersal of gravity and debris-flow deposits. Paleocurrents to the east reveal largely north-south normal faults located to the west and sediment supply from a proximal volcanic source area. A second stage, represented by a notable fining-thinning upward facies, including fluvial and palustrine (stromatolites with pedogenetic features) deposits, indicates a transition to tectonic quiescence. These facies associations developed in a context of low sedimentation rate, limited tectonic relief and low accommodation space. A third stage is represented by greenish well-rounded coarse-grained polymictic conglomerates of El Relincho Formation that unconformably truncate the Cerro Puntudo Formation. These conglomerates are interpreted as perennial braided fluvial systems (with paleocurrents to the northwest) indicating drainage reorganization primarily influenced by climate change and combined tectonic reactivation, previously considered the second rifting event. Climate change affected sediment delivery and allowed regionally connectivity and overfilling of the depocenters. In this last stage, northwest axial transport from variable sources within the Precordillera (to the southeast) is inferred from provenance analysis indicating open linkeddepocenters. This study suggests a new stratigraphic correlation for the northern part of the Cuyo basin, implying that during the first rifting event a semi-arid climate prevailed with development of isolated and independent depocenters (first and second stages), whereas above the unconform...

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Section: Palustrine Facies Associationsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Source-to-sink analysis of continental rift sedimentation: Triassic Cuyo basin, Precordillera Argentina

Teixeira

Astini

Gómez

et al. 2018

Sedimentary Geology

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“…Interpretation: Oncolites of this facies were generated by carbonate precipitation upon charophyte thalli and gyrogonites. The tubules observed in the oncolites and coatings are filamentous algae remains (Benavente et al ., ); these algae induced carbonate precipitation (Platt & Wright, ; Shiraishi et al ., ; Dupraz et al ., ). Similar associations between charophytes and filamentous epiphytes have been described previously (Martín‐Closas, ; Arp et al ., ).…”

Section: Resultsmentioning

confidence: 99%

Comparison of lacustrine successions and their palaeohydrological implications in two sub‐basins of the Triassic Cuyana rift, Argentina

et al. 2015

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Continental carbonates are rich in palaeoclimatic, palaeoenvironmental and palaeontological information. While carbonate accumulation mechanisms have been described for many types of continental environments, especially in extensional basins, there are still uncertainties that existing facies models fail to address. The Triassic Cerro de las Cabras and Cerro Puntudo formations are alluvial-fluvial-lacustrine sequences that represent a part of the sedimentary infill of two sub-basins of the Cuyana Basin during the early stages of the Triassic rift in west-central Argentina. Previous work has provided absolute dates, confirming that these deposits are coeval (Anisian) allowing a comparative study of carbonate sedimentation in an extensional tectonic context. The description and origin of freshwater carbonate deposits and their surrounding siliciclastic sediments in specific areas of the Cuyana rift, gives insight into the major factors that control carbonate precipitation in all rift basins, including the characterization of the palaeohydrology and the importance of provenance. The Cerro de las Cabras Formation represents an ephemeral, playa-lake depositional system with subaerial exposure and pedogenesis. Its aggradational succession corresponds to the evaporative facies association lake type, diagnostic of underfilled lake basins where persistently closed surface hydrology can lead to thick evaporites. However, this formation lacks thick evaporites and has microbialitic limestones, pointing to an open groundwater supply. The Cerro Puntudo Formation represents an alkaline playa-lake system fed by groundwater and ephemeral surface-water input. The unit is an aggradational-minor progradational succession, pointing to a fluctuating profundal facies association, suggesting a balanced-filled lake type. These two synchronous, lacustrine depositional systems were influenced by tectonics and climate. Provenance and hydrology are key controls in carbonate accumulation in continental rift basins that must be included in future facies models for continental carbonates. Comparison with other rift basins suggests that application of lake-type characterizations coupled with palaeohydrology and provenance patterns will aid in developing new sedimentation models for freshwater limestones in extensional settings.

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“…Nevertheless, the systems record an overall positive hydrologic balance (Benavente et al, 2019). This means that despite the arid seasonal conditions, groundwater input maintained a permanent water body at least at the Cerro Puntudo sub-basin, in which sedimentology reveals no desiccation features for lacustrine facies associations (Benavente et al 2012(Benavente et al , 2015. Even though the lacustrine systems cover a the entire northern area of the Cuyana Basin, the arid seasonal conditions interpreted for these localities may in part reflect a possible rain shadow effect caused by the highlands to the west of the basin (tectonic control) and not simply a regional paleoclimate pattern (Benavente et al, 2015).…”

Section: Cuyana Basinmentioning

confidence: 98%

The paleoclimatic context for South American Triassic vertebrate evolution

Mancuso

Horn

Benavente

et al. 2021

Journal of South American Earth Sciences

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First occurrence of charophyte algae from a Triassic Paleolake in Argentina and their paleoenvironmental context

Cited by 14 publications

References 47 publications

Source-to-sink analysis of continental rift sedimentation: Triassic Cuyo basin, Precordillera Argentina

Source-to-sink analysis of continental rift sedimentation: Triassic Cuyo basin, Precordillera Argentina

Comparison of lacustrine successions and their palaeohydrological implications in two sub‐basins of the Triassic Cuyana rift, Argentina

The paleoclimatic context for South American Triassic vertebrate evolution

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