Linked variations in sediment accumulation rates and sea-level in Guanabara Bay, Brazil, over the last 6000years

Figueiredo, Alberto G.; Toledo, Mauro Bevilacqua de; Cordeiro, R. C.; Godoy, José Marcus; Silva, Fabiano T. da; Vasconcelos, Sérgio Cadena de; Santos, Ricardo Álvares dos

doi:10.1016/j.palaeo.2014.08.027

Cited by 39 publications

(21 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This is also supported by the significant positive correlations between TOC and sedimentary fine fraction. These results of surface sediments well agree with data obtained from sediment cores presented in this work and also that performed by Figueiredo Jr. et al (2014).…”

Section: Surface Sedimentssupporting

confidence: 92%

“…The distribution of gas acoustic signatures when correlated with bathymetry, it is associated with higher topographic gradient area (E/NE). This margin receives the influence of most significant drainage from the basin of the Guanabara Bay (Figueiredo Jr. et al, 2014). The bottom sediments at the gas occurrence area are classified as coarse silt to very coarse silt and in this zone the organic matter content can reach 10-20% (Galvão, 2014).…”

Section: Distribution Of Gas and Core Sediment Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

High-Resolution Acoustic Mapping of Gas Charged Sediments and Living Benthic Foraminifera Assemblages From the Ne Region of the Guanabara Bay (Rj, Brazil)

et al. 2016

View full text Add to dashboard Cite

. High-resolution acoustic mapping of gas charged sediments and living benthic foraminifera assemblages from the NE region of the Guanabara Bay (RJ, Brazil). Journal of Sedimentary Environments, 1 (3): 360-384. AbstractThis work was performed in the NE region of the Guanabara Bay, a highly impacted Brazilian coastal system, located in Rio de Janeiro State. It aimed to: i) identify and map the areas with occurrence of gas in the sediment, as well as its acoustic signature; ii) characterize the physical properties of the sediments and; iii) document the response of microbenthic organisms (living benthic foraminifera) to changes in quantity and quality of organic matter. Seismic surveys at the frequency of 12 kHz identified a large area with about 50% gas charged sediments in the study area.The main acoustic signatures of the shallow gas were black shadow and gas blanket. In addition, features related to gas seepages to the water column (acoustic plumes and pockmarks) and gas percolation within the sediments (intrasedimentary plumes, turbidity pinnacles) were also identified. The gas has a biogenic origin and results from the high acumulation rate between 0.03 to 0.9 cm.year -1 and from the decomposition of large amount of organic matter (10-20%). Vertical distribution of gas ranges from few centimeters to 9 m below the water-sediments interface. These occurrences are related to both gas migration from lower sedimentary layers to Holocene muds above, and to recent generation in near-surface sediments as the area display favorable conditions for gas production. Cores ranging from 150-240 cm in length have predominantly muddy sediments and variations in the P-wave velocity followed the changes in sediment density, controlled mainly by the presence of gas in sediments, bioclasts accumulation, textural variation and percentage of organic matter. Journal of Sedimentary Environments

show abstract

Section: Surface Sedimentssupporting

confidence: 92%

Section: Distribution Of Gas and Core Sediment Propertiesmentioning

confidence: 99%

High-Resolution Acoustic Mapping of Gas Charged Sediments and Living Benthic Foraminifera Assemblages From the Ne Region of the Guanabara Bay (Rj, Brazil)

et al. 2016

View full text Add to dashboard Cite

show abstract

“…years BP are probably the result of abundant sediment discharge due to significant climate change and sea level elevation, as shown by Kirchner et al (2015) andFigueiredo Jr. et al (2014). Facies analysis and radiocarbon dating on core T4 indicate that the transgressive infilling of the outer part of the bay started before 8200 cal.…”

Section: Discussionmentioning

confidence: 99%

“…In large protected coastal bays, such as Guanabara Bay in Rio de Janeiro, sedimentation and accumulation of silt-clay particles are enhanced by estuarine processes, specially under microtidal conditions (Kjerfve et al, 1997;Figueiredo Jr. et al, 2014;Murray-Wallace and Woodroffe, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Given the depth (over 50 meters) of the channel (Kjerfve et al, 1997) that connects the bay to the ocean and eustatic sea level observed elsewhere (Lambeck and Chappell, 2001;Muhs et al, 2003;Rabineau et al, 2006), that estimative is consistent. Sediment accumulation and supply to Guanabara Bay throughout the Holocene are quite complex and yet not fully understood (Figueiredo Jr. et al, 2014;Kirchner et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Northeast Guanabara Bay and Coastal Plain Holocene Sedimentary Evolution (Brazil): A Contribution

et al. 2017

View full text Add to dashboard Cite

Sedimentological and radiocarbon investigations are part of an ongoing research on the Bay-head delta of northeast Guanabara Bay, Rio de Janeiro State. Sediment accumulation indicates that the Holocene infill of the bay-head delta started around 8.2 kyr BP and was not in pace with the eustatic sea-level rise. Sediment accumulation was faster during the transgressive phase (0.56 cm.yr -1 ). However, during the regressive phase, progradation driven by baselevel fall was predominant over vertical sediment accumulation (0.02 cm.yr -1 ). Based on coring, three sedimentary units were defined: fluvial sands (U1), estuarine deposits (U2) and fluvial mud (U3).

show abstract

Brazilian Estuaries: A Geomorphologic and Oceanographic Perspective

Lessa

Santos

Filho

et al. 2018

Brazilian Marine Biodiversity

View full text Add to dashboard Cite

Linked variations in sediment accumulation rates and sea-level in Guanabara Bay, Brazil, over the last 6000years

Cited by 39 publications

References 13 publications

High-Resolution Acoustic Mapping of Gas Charged Sediments and Living Benthic Foraminifera Assemblages From the Ne Region of the Guanabara Bay (Rj, Brazil)

High-Resolution Acoustic Mapping of Gas Charged Sediments and Living Benthic Foraminifera Assemblages From the Ne Region of the Guanabara Bay (Rj, Brazil)

Northeast Guanabara Bay and Coastal Plain Holocene Sedimentary Evolution (Brazil): A Contribution

Brazilian Estuaries: A Geomorphologic and Oceanographic Perspective

Contact Info

Product

Resources

About