Jurassic Uplift Along the Huincul Arch and Its Consequences in the Stratigraphy of the Cuyo and Lotena Groups. Neuquén Basin, Argentina

Zavala, Carlos; Arcuri, Mariano; Meglio, Mariano Di; Zorzano, Agustin; Otharán, Germán

doi:10.1007/978-3-030-29680-3_3

Cited by 10 publications

(29 citation statements)

References 8 publications

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“…In the light of measured paleocurrent directions in both areas having northward to north northwestward sediment transport direction (Gugliotta et al, 2015; Olariu et al, 2020), it is likely that La Jardinera was slightly more proximal and lay slightly closer to the basin margin than Bajada de los Molles. We suggest therefore that the basal Lajas formation at Bajada de los Molles is likely to be early Aalenian, consistent with dating of Zavala (Zavala, 1996a, 1996b) and with McIlroy et al (2005). The sedimentology of Lajas Formation has probably been researched more often around Bajada de Los Molles than at any other location in the Neuquén Basin.…”

Section: Analysis Of Lajas Formation In Five Study Areassupporting

confidence: 89%

“…The Lajas Formation is a Lower‐Middle Jurassic, post‐rift interval developed in a back‐arc basin, <500 m thick (Gulisano et al, 1984; Legarreta & Uliana, 1996; Veiga et al, 2013; Vergani et al, 1995; Zavala, 1993, 1996a) but with local depocenters up to 1000 m thick (e.g., southern flank of Huincul Arch, Kim et al, 2014). The Lajas Formation, representing the topsets of Cuyo Group basin‐margin clinoforms (Figure 1a), consists of fluvial, marginal marine, shallow‐marine and shelf‐edge deposits (Olariu et al, 2020; Paim et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

“…The large‐scale progradation of this system shows a broad aggradational to progradational trajectory (see dotted black line in Figure 1a) (Brinkworth et al, 2017; Gómez et al, 2018; Loss et al, 2018). There are also likely hiata in the succession as the shorelines passed northward across the active Huincul Arch (Zavala et al, 2020; Zavala & Gonzalez, 2001).…”

Section: Introductionmentioning

confidence: 99%

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Prograding early to middle Jurassic margin, Neuquén Basin: Topset process stratigraphy and morphodynamic sediment partitioning

et al. 2023

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Section: Analysis Of Lajas Formation In Five Study Areassupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Prograding early to middle Jurassic margin, Neuquén Basin: Topset process stratigraphy and morphodynamic sediment partitioning

et al. 2023

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“…According to Zavala et al (2006), periods of marine disconnection are usually associated with regional unconformities defined by sharp lithologic contacts between continental and marine deposits. Locally, angular unconformities can be recognized at the boundary between major sequences, thus suggesting some tectonic overprint (Zavala et al 2020). Groeber (1946) recognized three main transgressive-regressive sedimentary cycles: Jurásico, Ándico, and Riográndico.…”

Section: The Neuquén Basinmentioning

confidence: 99%

“…The Cuyo Group starts with offshore to prodeltaic marine shales and turbidites of the Los Molles Formation (Weaver 1931), a thick, organic-rich unit (1-5% TOC, Chebli et al 2011) originally interpreted as deposited in a deep-marine environment characterized by euxinic bottom waters. More recently, Zavala et al (2014Zavala et al ( , 2020, based on facies analysis, reinterpreted these deposits as a complete suite of offshore to prodelta deposits, which are in part the result of muddy hyperpycnal flows. The Los Molles Formation is transitionally overlain by a thick succession of shelfal to shallow-marine sandstones and conglomerates of the Lajas Formation (Weaver 1931).…”

Section: The Neuquén Basinmentioning

confidence: 99%

New contributions to the palaeoenvironmental framework of the Los Molles Formation (Early-to-Middle Jurassic), Neuquén Basin, based on palynological data

Olivera

Martínez

Zavala

et al. 2020

Facies

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Being the main oil-bearing basin of Argentina, the Neuquén Basin contains a well-documented stratigraphic record of continental and marine sedimentation during the Jurassic and Cretaceous in the western margin of Gondwana. Marine sedimentation started in the Early Jurassic with the deposition of the offshore to prodelta shales of the Los Molles Formation, the basal unit of the Cuyo Group. A palynological study of outcrop samples of the Los Molles Formation at two localities, Puente Picún Leufú, southern Neuquén Basin, and Cordillera del Viento, central basin area, is presented. The palynological evidence allows inferring two different palaeoceanographic contexts during the deposition of the Los Molles Fm. At Puente Picún Leufú and the lower part of the Cordillera del Viento localities, the record of acritarchs and prasinophytes suggests a stratified water column, suboxic-to-anoxic bottom conditions, and a reduced salinity within the photic zone, associated with a marginal marine environment under restricted oceanic circulation. These conditions would have last at least until the Early Bajocian. Conversely, at the middle and mainly the upper part of Cordillera del Viento locality, the predominance of dinocysts in the assemblages indicates a hydrographically unstable shelf (non-stratified water mass column) with welloxygenated bottom waters developed under open-marine settings with non-restricted oceanic circulation. The abundance and diversity of dinocyst assemblages are comparable with those observed in the Late Callovian Lotena Formation. These evidences suggest an open oceanic circulation due to the establishment of different seaways in the Neuquén Basin, during the final accumulation of the Los Molles Formation (Early Callovian).

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Deltas: New paradigms

Zavala,

Arcuri,

Zorzano

et al. 2024

The Depositional Record

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Deltas are deposits directly accumulated by land‐generated gravity flows in a standing body of water. The paradigm of deltaic sedimentation has dramatically changed during recent years, from the popular very simplified ternary models of marine littoral deltas towards more realistic and comprehensive models, considering the importance of sediment‐laden river discharges. Ternary delta models were designed for clean rivers, where a stream flow drags the sediments. Depending on the basin dynamics, these littoral deposits can be modified, forming tidal‐dominated, wave‐dominated or fluvial‐dominated littoral deltas. In recent years, a new classification of delta systems was proposed, based on contrasting the salinity of the receiving water body with the bulk density of the incoming fluvial discharge. Rivers are highly dynamic systems, and their discharges can be very variable in terms of flow duration and sediment concentration. Additionally, the salinity of the receiving water body can exhibit significant variability, especially in closed lakes and epicontinental seas, ranging from freshwater to brines. This scenario allows the distinction of three major delta categories (hypopycnal, homopycnal and hyperpycnal deltas) which can be in turn subdivided, defining seven delta types. Hypopycnal deltas form when the bulk density of the incoming flow is lower than the density of the water in the basin, allowing the definition of three delta types, corresponding to hypersaline littoral deltas, marine littoral deltas and brackish littoral deltas. Homopycnal deltas form when the bulk density of the incoming flow is similar to the density of the water in the basin, defining a delta type termed homopycnal littoral deltas. Hyperpycnal deltas form when the bulk density of the incoming flow is higher than the density of the water in the basin, allowing the definition of three categories termed hyperpycnal littoral deltas, hyperpycnal subaqueous deltas and hyperpycnal fan deltas.

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Jurassic Uplift Along the Huincul Arch and Its Consequences in the Stratigraphy of the Cuyo and Lotena Groups. Neuquén Basin, Argentina

Cited by 10 publications

References 8 publications

Prograding early to middle Jurassic margin, Neuquén Basin: Topset process stratigraphy and morphodynamic sediment partitioning

Prograding early to middle Jurassic margin, Neuquén Basin: Topset process stratigraphy and morphodynamic sediment partitioning

New contributions to the palaeoenvironmental framework of the Los Molles Formation (Early-to-Middle Jurassic), Neuquén Basin, based on palynological data

Deltas: New paradigms

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