Shallow geophysical methods for recognition of holocene sedimentary sequences in the southern coastal plain of the Río de la Plata (Argentina)

Cavallotto, José Luis; Bonomo, Néstor; Grünhut, Vivian; Medina, Peter Zabala; Violante, Roberto A.; Onnis, Luciano Emanuel; Osella, A.

doi:10.1016/j.jsames.2020.102662

Cited by 3 publications

(3 citation statements)

References 36 publications

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“…The low‐relief southern coast of the Río de la Plata forms the northern boundary of the Salado Basin (Cavallotto et al ., 2020), where a ca 6 km thick upper Mesozoic to Cenozoic sedimentary succession is capped by Miocene marine bioclastic clay, Pliocene fluvial sand and upper Pliocene–Pleistocene loess‐like deposits (Violante & Parker, 2004).…”

Section: The Argentine Passive Marginmentioning

confidence: 99%

“…A more than 500 km long palaeovalley was incised along the northern side of the modern estuary during late Pleistocene sea-level falls, extending as far as the continental shelf of Uruguay (Urien & Ewing, 1974). During the Holocene, the valley was submerged and filled with up to 40 m of estuarine silty clays, with minor fine bioclastic sand (Cavallotto & Violante, 2005). The marine transgression following the Last Glacial Maximum formed an abrasion surface in the inner shelf to the 30 to 40 m isobath (R ıoplatense Terrace), which is not yet covered entirely by the prograding Holocene coastal wedge but includes relict, semi-consolidated Plio-Pleistocene sands (Punta Piedras-Alto Mar ıtimo and Restinga de los Pescadores; Parker et al, 2008).…”

Section: R ıO De La Plata Estuarymentioning

confidence: 99%

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From Patagonia to Río de la Plata: Multistep long‐distance littoral transport of Andean volcaniclastic sand along the Argentine passive margin

et al. 2021

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Large sediment masses are transferred over many hundreds of kilometres along the coast of passive continental margins worldwide. The relevance of such a phenomenon for source-to-sink studies, environmental issues, and coastal management remains largely unperceived. This study traces the paths of volcaniclastic sand along ca 2170 km of the Argentine coast and documents a 760 km long cell of littoral transport extending from the formerly larger R ıo Colorado delta to the edge of the R ıo de la Plata mouth. During deglaciation stages and humid periods of the Pleistocene, a much greater sediment volume than today was transferred by the Desaguadero and Colorado rivers from the highest-relief tract of the Andean Cordillera to the Atlantic Ocean. Amphibole-rich sand originally supplied by the R ıo Desaguadero is being recycled today from Pampean lowlands to feed the beaches along R ıo de la Plata southern shores, whereas pure quartzose sand of R ıo Paran a is found only adjacent to its prograding delta. Augite-rich sand supplied by the R ıo Colorado is dominant along the coast of the Buenos Aires Province, where it mixes locally with coarser-grained quartz-rich detritus recycled in the urbanized Mar del Plata area. Hypersthene-rich sand of the R ıo Negro is dispersed both north and south of the mouth, where heavy-mineral-rich lag deposits are formed in areas of accelerated erosion and retreating sea cliffs. Changes of mineralogical signatures during long-distance littoral transport are largely ascribed to local supply from coastal erosion or hydrodynamic effects rather than to selective breakdown of labile grains. Whereas the relative abundance of amphibole and pyroxene is largely independent of transport distance, olivine is depleted both in the northern part of the Colorado littoral cell and south of the R ıo Negro mouth, which is chiefly ascribed to dilution by recycling of Neogene sediments that have undergone early intrastratal dissolution rather than to mechanical loss.Keywords Amphibole Color Index, Colorado and Negro rivers, durability of olivine and pyroxene, longshore sand transport, passive-margin sediments, R ıo de la Plata estuary, R ıo Desaguadero, sedimentary petrology, Southern Hemisphere swells.

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Section: The Argentine Passive Marginmentioning

confidence: 99%

Section: R ıO De La Plata Estuarymentioning

confidence: 99%

From Patagonia to Río de la Plata: Multistep long‐distance littoral transport of Andean volcaniclastic sand along the Argentine passive margin

et al. 2021

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“…The left margin displays all the main sedimentary environments (geoforms), whereas the right margin shows the meandering perambulations of the Río Paraná that reworked the recent sedimentary accumulations. Many of these bedforms are related to the sea-level variations of the last 6000 years BP (Prieto et al, 2017) and their fluctuations (few meters) have been studied (Cavallotto et al, 2020;Cellone et al, 2016;Escobar et al, 2004;Isla, 1989;Isla & Espinosa, 2021). The Paraná delta currently progrades (Schuerch et al, 2016) at a rate of 1.52-1.74 cm per day (cm day −1 ).…”

Section: Introductionmentioning

confidence: 99%

Chronology of recent sedimentary infill of the Inner Río de la Plata Estuary, Argentina

et al. 2021

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The Inner Río de la Plata Estuary is a sedimentary depositional system that resulted from fluvial-deltaic activity. Gentle Pliocene–Pleistocene slopes make-up the northern side of the estuary whereas small cliffs of the same age constitute the southern side. A long coastal estuarine barrier developed at about 6000 years BP when the maximum flooding surface occurred. Attached to this barrier, and at a lower elevation, is a large strandplain (covering an area of about 2400 km2) which displays more than 220 beach ridges. In different areas, the dating indicates a periodicity of 13.4–13.7 years for the development of each beach ridge. These data are like the periodicity of the ENSO effects, which could be associated with the variability of Sunspots. These ridges were formed shortly after the maximum flooding surface, which was followed by a gradual fall in sea-level that contributed significantly to the Inner Río de la Plata Estuary sedimentary infill. In addition, ENSO activities were probably instrumental in the distribution of the main geoforms in the Inner Rio de la Plata Estuary. Small deltas, which were generated by other rivers and creeks such as the Nogoyá Arroyo and the Gualeguay River, developed coevally with the coastal estuarine barrier. The Ibicuy Delta grew in the middle of the inner Río de la Plata Estuary when the former Paraná River flowed northwards during the sea-level fall. The upper part of the delta front was reworked, giving rise to a large dunefield. Thereafter, a chenier plain developed along with tidal flats. The current Paraná Delta continues to prograde at a rate of about 56–64 m/year (m year−1). The sedimentary infill of the Inner Río de la Plata Estuary occurred along the Holocene.

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Assessing the earthquake hazard around the Río de la Plata estuary (Argentina and Uruguay): Implications for risk assessment

Baxter

Bettucci

Costa

2021

Journal of South American Earth Sciences

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Shallow geophysical methods for recognition of holocene sedimentary sequences in the southern coastal plain of the Río de la Plata (Argentina)

Cited by 3 publications

References 36 publications

From Patagonia to Río de la Plata: Multistep long‐distance littoral transport of Andean volcaniclastic sand along the Argentine passive margin

From Patagonia to Río de la Plata: Multistep long‐distance littoral transport of Andean volcaniclastic sand along the Argentine passive margin

Chronology of recent sedimentary infill of the Inner Río de la Plata Estuary, Argentina

Assessing the earthquake hazard around the Río de la Plata estuary (Argentina and Uruguay): Implications for risk assessment

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