Mid-Holocene evolution and paleoenvironments of the shoreface–offshore transition, north-eastern Argentina: New evidence based on benthic microfauna

Laprida, Cecilia; Chapori, Natalia Luz García; Violante, Roberto A.; Compagnucci, Rosa Hilda

doi:10.1016/j.margeo.2007.02.001

Cited by 40 publications

(47 citation statements)

References 23 publications

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“…A possible scenario for the sea level highstand at 6 cal kyr BP is that this transgressive event drowned the RdlP estuary and blocked delivery of sediments from cratonic areas, thus restricting the northward transport of this material to the Brazilian continental shelf by the BCC. This change in delivery coincides with the beginning of fluvial input just south of the RdlP estuary as (Behling, 2003), (b) Botuverá Cave (Cruz et al, 2005), (c and d) pollenCambará do Sul (Behling et al, 2004), (e) western South Atlantic, GeoB6211 core (Chiessi et al, 2010), and (f) Ti/Ca, (g) Susceptibility, (h) ARM (%) and (i) ARM/IRM ratio for the core 7610. estimated by Laprida et al (2007) after 5.0 cal kyr BP, and it coincides with the sea level fall at that time. During maximum sea level the sediments that deposited on Brazilian continental shelf were likely derived from the Argentinean continental shelf and were transported to a northward position by the PC.…”

Section: Sea Level Changes In the Southeast Brazil Continental Marginsupporting

confidence: 75%

“…11h,i, respectively), which show that after 4.7 cal kyr BP coarser grains (MD) became progressively more dominant with a peak of relative abundance after 2 cal kyr BP. Laprida et al (2007) recorded RdlP fluvial sedimentation south of the river mouth and attributed it to the drop in sea level after 5 cal kyr BP.…”

Section: Sea Level Changes In the Southeast Brazil Continental Marginmentioning

confidence: 99%

“…Most of the suspended material transported into the RdlP derives from the erosion of Paraná volcanics (e.g. Depetris et al, 2003;Garming et al, 2007;Laprida et al, 2007). The other main source of sediments to the SE Brazilian shelf is the dust transported eastward from the Andes Cordillera and deposited on the Argentinean Pampas in an extensive loess sequence (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic fingerprint of the late Holocene inception of the Río de la Plata plume onto the southeast Brazilian shelf

Mathias¹,

Nagai²,

Trindade³

et al. 2014

Palaeogeography, Palaeoclimatology, Palaeoecology

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Section: Sea Level Changes In the Southeast Brazil Continental Marginsupporting

confidence: 75%

Section: Sea Level Changes In the Southeast Brazil Continental Marginmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Magnetic fingerprint of the late Holocene inception of the Río de la Plata plume onto the southeast Brazilian shelf

Mathias¹,

Nagai²,

Trindade³

et al. 2014

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…This species of Buccella is widely distributed in the Bahía Blanca estuary (Cusminsky et al, 2006(Cusminsky et al, , 2009Calvo-Marcilese et al, 2011). It has also been recorded in Holocene material from Bahía Blanca (see sections N1, PS2B2, CdM, C3B in the Figure 1 of this paper, and Gómez et al, 2005;Cusminsky et al, 2009;Calvo-Marcilese et al, 2011) and from late Holocene deposits along north-and south-eastern Buenos Aires province (Boltovskoy, 1970(Boltovskoy, , 1976Laprida, 1998;Laprida et al, 2007;Ferrero, 2006;Alperin et al, 2011). In present-day Bahía Blanca estuary material, Buccella is widely distributed in subtidal and inner shelf environments but has rarely been recovered from intertidal habitats (Cusminsky et al, 2006;Calvo-Marcilese & Pratolongo, 2009).…”

Section: Biogeographysupporting

confidence: 58%

Ontogenetic morphogenesis and biogeographic patterns: resolving taxonomic incongruences within “species” of Buccella from South American coastal waters

Calvo-Marcilese¹,

Negro

Langer

2012

Rev. bras. paleontol.

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The analysis of ubiquitous material of individual growth stages of the foraminifer Buccella from the Bahía Blanca estuary reveals a wide range of morphogenetic expressions. The observations of morphological changes expressed during ontogeny display a continuous record of transitional stages that are reflected in juvenile, adolescent, and adult test shapes. The morphological features of individual growth stages were found to match specifications that were previously used to delineate individual species of Buccella from around South America. This indicates that juvenile, adolescent, and adult morphotypes of Buccella do not represent end members of individual species, subspecies, forms, or varieties. In fact, they constitute a continuous sequence of ontogenetic stages that ultimately result in the morphotype that was originally described and depicted by d'Orbigny, in the first half of the nineteenth century, under the name Rotalina peruviana (currently known as Buccella peruviana). The morphological expressions of juvenile, adolescent, and adult forms have potential applications for paleoecological studies in South American waters. RESUMO-A análise das diferentes fases de crescimento do foraminífero Buccella, com base em rico material recuperado do Estuário de Bahia Blanca, revelou uma vasta gama de expressões morfogenéticas. As observações de alterações morfológicas durante a ontogenia estão expressas num registo contínuo de estágios transicionais que estão refletidos nas diferentes fases de crescimento, i.e., nos juvenis, adolescentes e adultos. As características morfológicas das fases individuais de crescimento coincidem com as especificações utilizadas anteriormente no delineamento individual das espécies de Buccella originárias da América do Sul. Isto significa que os diferentes morfotipos correspondentes às fases juvenil, adolescente e adulto no gênero Buccella não representam membros finais de espécie, subespécie, forma ou variedade. Na verdade, eles constituem uma sequência contínua de fases ontogénicas que, em última análise, resultam no morfotipo originalmente descrito e retratado por d'Orbigny, na primeira metade do século dezenove, sob o nome Rotalina peruviana (atualmente denominada Buccella peruviana). As expressões morfológicas de formas juvenis, adolescentes e adultas têm aplicações potenciais para estudos paleoecológicos em águas sul-americanas.

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“…The depositional style of the IRPE was controlled by overall Holocene sea-level variation and by changes in the sediment supply of the PUR system (Depetris et al 1996;Piola et al 2008). However, in contrast to the gentle slope depicted by the gradual Holocene sea-level curve (Milne et al 2005), recent data from near the study area in northeastern Argentina (Laprida et al 2007) indicate a marked sea-level fall event in the period 3188-2854 cal 14 C aBP. This may have been related to cold pulses in the middle-Holocene known as Neoglaciation, and would have coincided with rapid climate changes (Mayewski et al 2004;Pedoja et al 2011) and with the Neoglaciation pulses based on the records of glacial fluctuations (Denton & Karlen 1973).…”

Section: Ibicuy Sandy Bodymentioning

confidence: 95%

Río de la Plata inner estuary (Argentina): main forms, sedimentary infill and Holocene evolution

Piñol

Serra

Rivero

2014

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The emerged part of the Río de la Plata estuary is characterized by striking coastal geomorphic features. Aerial and satellite images, field observations of the outcrops, shallow boreholes, radiometric dating of sand and shells and Ground Penetrating Radar surveys were analysed. The main sedimentary features are: a large coastal barrier (up of 220 km long), old coastal lagoons, attached beach ridge (about 210) sets distributed along 170 km, the Ibicuy sand body variously interpreted as a reworked shoal/island or delta, and cheniers. The tidal flats and the modern Paraná Delta are located in the centre and on the right side of the inner estuary. The height of the estuarine coastal barrier represents the maximum flooding surface (MFS) of the last transgression at about 6000 aBP. Other main sedimentary forms developed as a falling stage systems tract (FSST) during the sea-level drop between the aforementioned date and the present. The sea surface was about 5 m above sea-level in the inner part of the estuary during the middle-Holocene. This MFS was subsequently followed by a continuous and slow sea-level fall that controlled the generation of the large sedimentary forms developed in the innermost part of the Río de la Plata Estuary.

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Mid-Holocene evolution and paleoenvironments of the shoreface–offshore transition, north-eastern Argentina: New evidence based on benthic microfauna

Cited by 40 publications

References 23 publications

Magnetic fingerprint of the late Holocene inception of the Río de la Plata plume onto the southeast Brazilian shelf

Magnetic fingerprint of the late Holocene inception of the Río de la Plata plume onto the southeast Brazilian shelf

Ontogenetic morphogenesis and biogeographic patterns: resolving taxonomic incongruences within “species” of Buccella from South American coastal waters

Río de la Plata inner estuary (Argentina): main forms, sedimentary infill and Holocene evolution

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