Stratigraphy of the Iguapé-Cananéia lagoonal region sedimentary deposits, São Paulo State, Brazil: part I: field observations and grain size analysis

Relação solo-relevo-substrato geológico nas restingas da planície costeira do estado de São Paulo

“…Nessa sequência, algumas inconsistências cronológicas foram observadas entre as idades obtidas e aquelas utilizadas para definir os eventos transgressivo-regressivos do litoral paulista por Suguio & Martin (1978a). Por outro lado, as idades geológicas (TL e LOE) da sequência da Ilha de Cananeia (Figura 3) aproximam-se daquelas sugeridas por Suguio & Petri (1973), Suguio & Martin (1978a,b) e Watanabe et al (1997) Considerando as idades 14 C obtidas para os horizontes orstein e a premissa de que o tempo de residência médio (TRM) da matéria orgânica corresponde, aproximadamente, à metade do intervalo desde que sua acumulação se iniciou (De Coninck, 1980;Schwartz, 1988), pode-se inferir que as acumulações desse material nos horizontes B espódicos (orstein) iniciaram-se há cerca de 18.500, 9.600 e 4.260 anos A.P., respectivamente para os pedons P30, P03 e P10 (Quadro 1). Essas idades coincidem com os registros de variações do NRM na costa paulista: no Pleistoceno Superior, durante o último máximo glacial, ocorrido há aproximadamente 17.000-18.000 anos A.P., o NRM encontrava-se em profundidades próximas às atuais isóbatas de -110 m a -130 m (Suguio & Martin, 1976, 1978a.…”

The Southern Brazilian shelf: general characteristics, quaternary evolution and sediment distribution

“…Evidences of sealevel changes have been cited by several authors since the 19 th century (HARTT, 1870;BRANNER;1904), but initially these changes were studied from a geomorphological point of view and assumed to be Tertiary in age. Only after the 1960´s and, more frequently during the 1970´s and 1980´s, with systematic studies undertaken from the coast of Rio Grande do Sul (S Brazil) to Alagoas (NE Brazil), and with thousands of radiocarbon datings have the Holocene relative sea-level change curves for different sectors of the Brazilian coast been determined (SUGUIO et al, 1985;ANGULO et al, 2006).…”

“…The stratigraphy of the Quaternary sedimentary deposits of the Cananéia-Iguape coastal plain (SE Brazil) was first described by Suguio (1971, 1973) and Suguio and Petri (1973) and may be taken as a reliable model for the Late Pleistocene evolution of the Southern Brazilian coast. Those researches were based their findings mainly on field observations and borehole data.…”

“…The most recent high sea-levels have been defined by virtue of numerous reconstructions of recent sea-levels in space and time, carried out using more than 700 radiocarbon datings (SUGUIO et al, 1985;SUGUIO, 1995). Moreover, the positions of some shell-middens, together with a comparison of the radiocarbon ages and δ 13 C values of mollusk shells, have supplied very interesting additional information on relative sea-level fluctuations during the last 6,000 years .…”

Is there a true delta at the Ribeira de Iguape river mouth, São Paulo State?

“…The coastal plain adjacent to its mouth extends for more than 1,500 km 2 , with the shape of a large erosion amphitheatre filled by the Cananeia Formation (Suguio and Petri, 1973) pleistocene sediments and the Ilha Comprida Formation (Suguio and Martin, 1994) holocene deposits of shallow marine environments, which are mapped in a reconnaissance scale, by Suguio andMartin (1978a, 1978b), and in a regional map of Instituto de Pesquisas Tecnológicas -IPT (1981), as seen in Figure 1.…”