El sistema lacustre de la Formación Mollar en el depocentro triásico de Santa Clara (provincia de Mendoza, Argentina)

Spalletti, Luis Antonio; Zavattieri, Ana Marı́a

doi:10.4067/s0718-71062009000200004

Cited by 3 publications

(4 citation statements)

References 43 publications

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“…The Santa Clara Abajo Formation belongs to the El Peñasco Group (Spalletti & Zavattieri 2009) and represents part of the infilling in the northern area of the Triassic Cuyana rift Basin. The deposits of the succession represent a fluvial–deltaic–lacustrine system.…”

Section: Geological Settingmentioning

confidence: 99%

“…1). All continental Triassic units that crop out in the area (Stappenbeck 1910; Stipanicic 1947; Groeber & Stipanicic 1953; Spalletti 2001) are part of the El Peñasco Group (Cortés et al 2003; Spalletti & Zavattieri 2009), composed of five sedimentary units, named from base to top: Cielo, Mollar, Montaña, Santa Clara Abajo and Santa Clara Arriba formations (Zavattieri 2002; Spalletti & Zavattieri 2009). Unfortunately, so far, this Group lacks chronostratigraphical resolution.…”

Section: Geological Settingmentioning

confidence: 99%

“…The Mollar Formation is formed by fine‐grained, stratified to massive sandstones alternating with carbon‐rich black mudstones (Harrington 1971). This unit has been interpreted as a lacustrine system with small‐scale cycles representing lake expansion and contraction (Spalletti & Zavattieri 2009). The Montaña Formation presents coarse‐grained stratified sandstones interbedded with finely stratified siltstones (Harrington 1971).…”

Section: Geological Settingmentioning

confidence: 99%

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Palaeolimnology of the Santa Clara Abajo Formation, Triassic of the Cuyana Basin Argentina, inferred from fish taphonomy

Benavente

Giordano

Mancuso

2021

LET

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The Santa Clara Abajo Formation in the north of Mendoza Province, Argentina, is part of the Triassic Cuyana rift Basin infill and consists of fluvial, deltaic and lacustrine units. The combination of progradational to aggradational stacking pattern plus the identification of a fluctuating profundal facies association suggests the Santa Clara Abajo palaeolake was a balanced-fill lake system. Lake-centre sediments (finely laminated mudrock facies) preserve pseudobeaconiid actinopterygian fish represented primarily by bones and scales, generally undeformed and concordant with bedding planes. We propose that variation of articulation degree of these fish combined with sediment features provides insights into palaeolimnological changes in this single lake system over time, primarily water temperature. The fish fossils are sorted into three taphonomic modes: Mode A, isolated and dispersed scales; Mode B, associated but dispersed scales, loosely to well sorted, and low to moderate density; and Mode C, scale patches and articulated fishes. We conclude these modes represent, respectively, warm, fluctuating warm-cold and cold water conditions. Stratigraphical analysis of the taphonomic modes for the balanced-fill lake model revealed an up-section pattern of fluctuating water temperatures (cold and warm), to a stable-cold pattern, to a stable-warm pattern and to fluctuating thermal conditions (cold and warm) again. This pattern is linked to lake-level fluctuations resulting in lacustrine intervals that reflect hydrological closure to opening to closure again. □ Actinopterygii, lake-basin-type model, Mendoza, Santa Clara sub-basin, Triassic.

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Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

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Palaeolimnology of the Santa Clara Abajo Formation, Triassic of the Cuyana Basin Argentina, inferred from fish taphonomy

Benavente

Giordano

Mancuso

2021

LET

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“…1). It has been thoroughly explored due to its rich fossiliferous content, mostly plant remains which have allowed to describe plant communities and to infer the paleoclimate (Spalletti, 2001;Bodnar et al, 2019;Ottone et al, 2019;Drovandi, 2020). The rocks of the Sorocayense Group are the main infill of the sub-basin, and despite the many structural, stratigraphical and sedimentological analysis of the area, the status of the Sorocayense Group units remains controversial (Baraldo and Guerstein, 1984;Abarzúa, 2016;Bodnar et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Diagenesis of continental carbonates linked to the evolution of the flexural margin of the Triassic Sorocayense-Hilario rift sub-basin, Argentina

Benavente

Matheos

Barredo³

et al. 2023

andgeo

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The lithostratigraphic units that conform the Sorocayense Group and fill the Sorocayense-Hilario sub-basin represent an alluvial-fluvial-lacustrine succession with significant volcanic supply during its deposition. They are namely the Cerro Colorado del Cementerio, Agua de los Pajaritos, Monina, Hilario and El Alcázar formations and present several carbonate levels. The genesis, diagenesis, and main controlling factors on continental carbonates present a means to understand basin evolution through the study of their petrography and chemical elemental composition through cathodoluminescence techniques. We have identified six microfacies: a) homogeneous micrite, b) bioclastic micrite, c) dolomicrite, d) laminated micrite, e) oncolitic packstone, and f) sparitic carbonate. Among these microfacies, six cementation and alteration phases have been identified: a) micritization, b) mechanical compaction, c) calcitic cementation, d) sparitic cementation, e) microsparitic cementation, and f) chemical compaction. This analysis allowed establishing a chronology of the diagenetic modifications undergone by the carbonates. Results support diagenesis was controlled mainly by tectonics showing major impact in carbonate facies identified at the flexural margin of the rift. The effect would have been linked to exertion of a paleohydrological effect favoring lateral meteoric water migration through faulting. The presence of dolomite in some of the microfacies is linked to the presence of montmorillonite as the dominant Mg-rich-phyllosilicate in clay assemblages most likely acting as the potential source. In turn, Mg is more likely to be replaced by Mn leading to luminescent carbonate microfacies.

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Macro- And Micromorphology of Scales from an Endemic South American Actinopterygian Family (Pseudobeaconiidae, Triassic, Cuyana Basin)

Giordano

Benavente²,

Davi

2023

Ameghiniana

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Pseudobeaconiidae is a South American endemic actinopterygian family recorded in the Middle-Late Triassic Cuyana and the Ischigualasto-Villa Unión rift basins. This family has been studied for more than seven decades by several authors. In spite of that, the morphological information about their scales is not complete, especially the one related to micromorphology, which has remained unknown until now.The main goal of this contribution is to provide new macro-and micromorphological information of scales from new material of Pseudobeaconiidae, including a brief revision of the scales of the family based on our own observations from material collections. The new studied specimens were recovered from the center lake facies of the Santa Clara Abajo Formation with detailed stratigraphic control Macromorphology of isolated scales confirms a peg-and-socket articulation in this new studied material.New features described also include the squamation general pattern including the scales of the lateral line, the ventral margin, that is characterized by round or angular scales and the presence of ganoine ornamentations covering preanal and postanal scutes.Regarding micromorphology, paleohistology shows lepidosteoid-type ganoid scales and; also, possible transitional ganoid scales between lepidosteoid and palaeoniscoidtype. Detailed morphological studies on Triassic faunas are necessary to obtain clearer patterns that contribute to the understanding of the evolution of Actinopterygii from Gondwana.

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El sistema lacustre de la Formación Mollar en el depocentro triásico de Santa Clara (provincia de Mendoza, Argentina)

Cited by 3 publications

References 43 publications

Palaeolimnology of the Santa Clara Abajo Formation, Triassic of the Cuyana Basin Argentina, inferred from fish taphonomy

Palaeolimnology of the Santa Clara Abajo Formation, Triassic of the Cuyana Basin Argentina, inferred from fish taphonomy

Diagenesis of continental carbonates linked to the evolution of the flexural margin of the Triassic Sorocayense-Hilario rift sub-basin, Argentina

Macro- And Micromorphology of Scales from an Endemic South American Actinopterygian Family (Pseudobeaconiidae, Triassic, Cuyana Basin)

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