Geomorphological and stratigraphic evolution of a fluvial incision in the coastal plain and inner continental shelf in southern Brazil

Barboza, Eduardo Guimarães; Dillenburg, Sérgio Rebello; Lopes, Renato Pereira; Rosa, Marcelo Prado Amaral; Caron, Felipe; Abreu, Vitor; Manzolli, Rogério Portantiolo; Nunes, José Carlos; Weschenfelder, Jair; Tomazelli, Luiz J.

doi:10.1016/j.margeo.2021.106514

Cited by 25 publications

(17 citation statements)

References 57 publications

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“…The trace analysis was done, and a dielectric constant of 10 for wet sand was used to convert travel time to depth, which represents a velocity of 0.09 m/ns [33][34][35]. This constant was validated using lithological data obtained from SPT drill holes [9,36,37].…”

Section: Ground Penetrating Radar (Gpr) Profilementioning

confidence: 99%

Holocene Sea-Level Changes in Southern Brazil Based on High-Resolution Radar Stratigraphy

et al. 2021

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This paper focuses on high-resolution coastal stratigraphy data, which were revealed by the Ground Penetrating Radar (GPR) system. Surveys performed with GPR on the surface of prograded barriers reveal patterns of reflections that allow the interpretation of the geometry and stratigraphy of coastal deposits in a continuous mode. At the Curumim prograded barrier in southern Brazil (29°30′ S–49°53′ W), a two-dimensional transverse GPR survey revealed, with high precision, a serial of contacts between aeolian deposits of relict foredunes and relict beach deposits that have a strong correlation with sea level. In a 4 km GPR profile, a total of 24 of these contacts were identified. The high accurate spatial positioning of the contacts combined with Optical Stimulated Luminescence dating resulted in the first confident sea-level curve that tells the history of sea-level changes during the last 7 ka on the southernmost sector of the Brazilian coast. The curve shows that sea-level was still rising before 6 ka BP, with a maximum level of 1.9 m reached close to 5 ka BP; after that, sea-level started to falling slowly until around 4 ka BP when fall accelerated.

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Section: Ground Penetrating Radar (Gpr) Profilementioning

confidence: 99%

Holocene Sea-Level Changes in Southern Brazil Based on High-Resolution Radar Stratigraphy

et al. 2021

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“…During the time in which Fell points were used, the sea level was 60/70m below its present position (Barboza et al . 2021: fig. 2) and the area of the Last Glacial Maximum continental shelf decreased by approximately one half.…”

Section: Discussionmentioning

confidence: 99%

Fell points from Merín Lagoon, Uruguay: new data and their relevance to the peopling of south-eastern South America

Nami

2022

Antiquity

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The dating and routes by which humans colonised South America continue to be debated. Recent research in Uruguay has yielded new Palaeoindian lithic finds from the southern shores of the coastal Merín Lagoon. The author's analysis of a group of Fell points—comparable to other regional examples—shows that this widespread artefact was produced using locally available materials and that they were repeatedly resharpened and repaired until no longer functional. The finds from the Merín Lagoon permit consideration of changing sea levels and their influence on colonisation routes, resource exploitation and archaeological preservation. The Atlantic coastline may have been one possible route of entry for early colonisers of South America.

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“…The Pelotas Basin is located in the southern portion of the Brazilian continental margin, and its filling began after the fragmentation of the Gondwana supercontinent (Dias et al, 1994;Bueno et al, 2007;Barboza et al, 2021). The subaerial portion of this basin consists of a > 700 km-long, 20 to 80 km-wide coastal plain.…”

Section: Study Areamentioning

confidence: 99%

Paleoecological characterization of ostracods in beachrocks from the Northern sector of the Rio Grande do Sul Coastal Plain, Brazil

Bergue¹,

Lopes²,

Caron³

et al. 2022

Rev. bras. paleontol.

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A micropaleontological analysis on 15 beachrock samples from the Northern sector of Rio Grande do Sul Coastal Plain (RSCP ), southern Brazil , revealed a relatively diverse and well-preserved ostracod assemblage composed of 16 species , including Cyprideis multidentata Hartmann, Callistocythere nucleoperiscum Whatley et al., Cytheretta punctata Sanguinetti, Caudites ohmerti Coimbra & Ornellas , and Argenticytheretta levipunctata Sanguinetti et al. Eleven ostracod species are left in open nomenclature or tentatively identified . Besides ostracods , some foraminifers , echinoderm spines, and fish remains (teeth) were also recovered ; however , the scarcity of specimens or poor preservation precluded identification at species level. Based on the Ostracoda taxonomic composition it is proposed that the beachrocks characterize environmentally condensed assemblages . This preliminary study reveals the importance and potentiality of micropaleontology for understanding the processes involved in the formation of beachrocks. Keywords: Pelotas Basin, Quaternary, coastal environments, micropaleontology, taphonomy.

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Geomorphological and stratigraphic evolution of a fluvial incision in the coastal plain and inner continental shelf in southern Brazil

Cited by 25 publications

References 57 publications

Holocene Sea-Level Changes in Southern Brazil Based on High-Resolution Radar Stratigraphy

Holocene Sea-Level Changes in Southern Brazil Based on High-Resolution Radar Stratigraphy

Fell points from Merín Lagoon, Uruguay: new data and their relevance to the peopling of south-eastern South America

Paleoecological characterization of ostracods in beachrocks from the Northern sector of the Rio Grande do Sul Coastal Plain, Brazil

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