Hauts niveaux marins Pleistocenes du littoral bresilien

Martin, Louis; Suguío, Kenitiro; Flexor, Jean-Marie

doi:10.1016/0031-0182(88)90042-9

Cited by 50 publications

(45 citation statements)

References 5 publications

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“…2). The oldest high phase occurred in the Last Interglacial period (approximately 120 kyr BP) when the RSL reached 8±2 m above the present sea level (MARTIN et al, 1988). The oldest low phase occurred during the Last Glacial Maximum (approximately 18 kyr BP) when the RSL was approximately 130 m below the present level (CORRÊA, 1996).…”

Section: Past Oceanographic Conditionsmentioning

confidence: 98%

Paleoproductivity changes during the Late Quaternary in the southeastern Brazilian upper continental margin of the Southwestern Atlantic

et al. 2010

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A B S T R A C TChanges in the Brazilian continental margin's oceanic productivity and circulation over the last 27,000 years were reconstructed based on sedimentological and microfaunal analyses. Our results suggest that oceanic paleoproductivity and the supply of terrigenous sediments to the Brazilian continental margin were higher during the Last Glacial Maximum (LGM) than during the Holocene. These changes may have been primarily influenced by significant sea level fluctuations that have occurred since the late Pleistocene. During the LGM, the lower sea level, higher productivity and lower sea-surface paleotemperatures may have been the result of the offshore displacement of the main flow of the Brazil Current. However, during the Holocene, the warm waters of the Brazil Current were displaced toward the coast. This displacement contributed to the increase in water temperature and prevented an increase in oceanic productivity. The decrease in terrigenous supply since the LGM could be related to the increase of the extension of the continental shelf and/or drier climatic conditions. R E S U M OMudanças na produtividade e circulação oceânica da margem continental Brasileira foram reconstituídas a partir de análises sedimentológicas e microfaunísticas realizadas em sedimentos de um testemunho representativo dos últimos 27 000 anos. Nossos dados sugerem maior produtividade oceânica e suprimento de sedimento terrígeno na área de estudo no Último Máximo Glacial (UMG) do que no Holoceno. Estas mudanças foram principalmente influenciadas por flutuações do nível relativo do mar. Durante o UMG, num cenário de nível relativo do mar mais baixo, a maior produtividade oceânica e menor temperatura da superfície do mar, podem ter sido produtos do deslocamento para o largo da Corrente do Brasil. No Holoceno, o deslocamento para a costa das águas quentes da Corrente do Brasil contribuiu para o aumento na temperatura da água e menor produtividade oceânica. A diminuição do aporte de sedimentos terrígenos desde o UMG pode estar relacionado ao aumento da extensão da plataforma continental e/ou a condições climáticas mais secas no continente.

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Section: Past Oceanographic Conditionsmentioning

confidence: 98%

Paleoproductivity changes during the Late Quaternary in the southeastern Brazilian upper continental margin of the Southwestern Atlantic

et al. 2010

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“…On the other hand, along the states of Santa Catarina (SC), Paraná (PR), and Rio Grande do Sul (RS) (Fig. 1), marine terraces with a minimum height of 13 m asl were found by Martin et al (1988). They are older than the barrierislands/lagoon system III found in the state of Rio Grande do Sul and probably record the transgressiveregressive episode of the barrier-islands/lagoon system II.…”

Section: Late Pleistocene Sea-level Highstands In Brazilmentioning

confidence: 99%

“…The deposits were named Cananéia Formation (Suguio and Petri 1973), and the related event was named Cananéia Transgression (Suguio and Martin 1978) or Penultimate Transgression (Bittencourt et al 1979, Martin et al 1988. Relative sea level during this event reached ∼8 ± 2 m asl.…”

Section: Late Pleistocene Sea-level Highstands In Brazilmentioning

confidence: 99%

Luminescence dated Late Pleistocene wave-built terraces in northeastern Brazil

Suguío

Bezerra

Barreto

2011

An. Acad. Bras. Ciênc.

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This study presents field and chronological investigations along the coast of northeastern Brazil from ∼4 • S to 9 • S latitude, which corresponds to ∼700 km of coastline under a semi-diurnal mesotidal regime. We investigated wave-built terrace deposits and dated sediments using the optically stimulated luminescence and thermoluminescence methods on quartz grains. The wave-built terraces yielded two main age groups: 200-230 ka and 100-130 ka, which we interpreted as depositional ages. We correlated these age groups with oxygen-isotope stages 7c and 5e, respectively. These events correspond to the antepenultimate and penultimate transgressions along the Brazilian coast. The deposits occur mainly in patches on low-lying flat plateaus along the littoral zone and incision valleys that cut across coastal tablelands. The altitude of the base of the 200-230 ka terraces ranges from 10 m above mean sea level (asl) to -2m asl, whereas the base of the 100-130 ka varies from 12 m asl to -2 m asl. Both terraces were deposited in the foreshore and upper shoreface zones. We noted a coincidence between sea-level highstand chronologies in northeastern Brazil and those in the Bahamas and Bermuda.

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“…The younger being the Last Transgression with a maximum at 5.1 ka when sea level rose 5 m above that of today. Sea-level lowered thereafter under high frequency oscillations up to a recent standstill and today's slight rise [29][30][31][32].…”

Section: Geomorphology and Evolutionmentioning

confidence: 99%