7 documents found, page 1 of 1
Late Holocene intensification of colds fronts in southern Brazil as indicated b...
Zular, André; Sawakuchi, André O.; Guedes, Carlos C. F.; Mendes, Vinícius R.; Nascimento Júnior, Daniel Rodrigues do; Giannini, Paulo C. F.Holocene coastal barriers from southern Brazil present great geomorphological changes during their late stages of development. In this study, we investigate the Holocene evolution of the São Francisco do Sul (SFS) barrier through geomorphological, heavy minerals and grain size analyses constrained by Optically Stimulated Luminescence (OSL) dating. The SFS barrier stands out among the southern Brazilian barriers...
Determination of controls on Holocene barrier progradation through application ...
Guedes, C. C. F.; Giannini, P. C. F.; Sawakuchi, A. O.; DeWitt, R.; Nascimento Júnior, Daniel Rodrigues do; Aguiar, V. A. P.; Rossi, M. G.Barrier development during the Holocene is studied using the example of the Ilha Comprida, Southeastern Brazil. Aerial photos, facies analysis, and optically stimulated luminescence dating are used to define the barrier emergence and evolution. Optically stimulated luminescence ages and facies successions indicate that the Ilha Comprida probably began as a Holocene transgressive barrier island 6000 years ago, j...
Controls of heavy minerals and grain size in a holocene regressive barrier (Ilh...
Guedes, C. C. F.; Giannini, P. C. F.; Nascimento Júnior, Daniel Rodrigues do; Sawakuchi, A. O.; Tanaka, A. P. B.; Rossi, M. G.Ilha Comprida is a regressive barrier island located in southeastern Brazil that was formed essentially by Quaternary sandy sediments. Ilha Comprida sediments were analyzed to assess heavy mineral indices and grain size variables. The spatial variation of heavy minerals and grain size was interpreted in terms of the present barrier dynamics and the barrier’s evolution since the Middle Holocene. These analyses a...
The development of blowouts and foredunes in the Ilha Comprida barrier (Southea...
Sawakuchi, A. O.; Kalchgruber, R.; Giannini, P. C. F.; Nascimento Júnior, Daniel Rodrigues do; Guedes, C. C. F.; Umisedo, N. K.Middle to Late Holocene barriers are conspicuous landforms in southeastern and southern Brazilian regions. The barriers in the coastal zones of northern Santa Catarina, Parana´ and Sa˜o Paulo states (27190– 24000S) are formed mainly by beach ridge alignments and many barriers present foredune and blowout alignments in their seaward portion. The development of these eolian landforms appears to record a regional ...
Sequence stratigraphy and organic geochemistry: An integrated approach to under...
Souza, Ana Clara B. de; Nascimento Júnior, Daniel Rodrigues do; Nepomuceno Filho, Francisco; Batezelli, Alessandro; Santos, Felipe H. dosAn organic geochemical investigation combined with sequence stratigraphy was performed in the Ceara´ Basin, an offshore basin located in Northeastern Brazil. The information available from 30 well logs (gamma-ray, resistivity, density), besides geochemical (TOC, and pyrolysis indexes) and isotopic (δ13C) data, aided the preparation of a dataset for this study. The application of sequence-stratigraphic methods h...
Chemical and mineral comparison of fossil insect cuticles from Crato Konservat ...
Bezerra, Francisco Irineudo; Silva, João H. da; Miguel, Emílio de Castro; Paschoal, Alexandre Rocha; Nascimento Júnior, Daniel Rodrigues doThe Crato Formation palaeoentomofauna from the Lower Cretaceous (Aptian) of northeast Brazil is extremely well preserved. Crato insects are often complete with abdomen, thorax, head, legs, wings articulated and fragile cuticle details observed at the macro and micro scale. The Crato Formation stands out for the high diversity of fossil insects with at least 386 described species, so far. We investigate the pres...
Mudanças morfológicas da extremidade NE da Ilha Comprida (SP) nos últimos dois ...
Nascimento Júnior, Daniel Rodrigues do; Giannini, Paulo Cesar Fonseca; Tanaka, Ana Paula Burgoa; Guedes, Carlos Conforti FerreiraIlha Comprida, a Holocene barrier built by alignments of littoral ridges, underwent intense morphologic changes in the past 200 years, mainly in its NE extremity. These changes includes northward shifting of the Icapara inlet, local variation of the width of the island, the formation of a small transgressive dunefield, an increase in the width of the Valo Grande artificial channel, and appearance and disappeara...