Journal of Sedimentary Environments
type: channel
description: Journal of Sedimentary Environments (JSE) is an open access online international journal that provides online publication of original research work, review and views in all areas related to Sedimentology and Environment and related subjects from all over the world. The JSE is being published by the Palaeontology and Stratigraphy Department of University of State of Rio de Janeiro with an objective to promote speedy publication of research work fulfilling the general criteria of significance and scientific excellence. All articles published in JSE are rigorously peer-reviewed. The Journal is published four-annually (four numbers per year). JSE accepts works related with present and past sedimentary environments, based on a multiproxy and/or a multidisciplinary perspective. The integration of scientific knowledge in the field of Earth and Life Sciences, its relationship with other sciences and areas of knowledge and technological tools and devices developed for the study of sedimentary environments and prospection of natural resources is encouraged. The whole process of submission and article evaluation is done electronically. JSE offers the following advantages: Variable-length articles, compatible with the interests of the subject and its needs; Permanent online access to the full manuscripts and published data bases; Color publication of photos and figures on the web version; Online inclusion of additional material (data, color pictures, animations and maps); Quick editing; JSE doesn’t apply fees to submission and works publication; Manuscripts for JSE can be submitted in Portuguese, Spanish or English but are only published in English. e-ISSN: 2447-9462 | Creation year: 2016 | Knowledge area: Geosciencies | Evaluated by CAPES Qualis for: Geosciences; Environmental Sciences; Anthropology/Archeology; Engineers II; Geography; Urban and Regional Planning/Demography
publisher: Universidade do Estado do Rio de Janeiro
language: en-US
publication name: Journal of Sedimentary Environments
issn: 2447-9462
copyright: The copyright of articles published in Journal of Sedimentary Environments (JSE) belong to their respective authors with rights to first publication conceded to the journal. Every time that the article is cited and reproduced in institutional repositories or personal and professional web pages the link to the journal web page must be provided. Journal of Sedimentary Environments (JSE) is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 4.0 International License.
items: EVALUATION OF THE BEST-FIT PROBABILITY OF DISTRIBUTION AND RETURN PERIODS OF RIVER DISCHARGE PEAKS. CASE STUDY: AWETU RIVER, JIMMA, ETHIOPIA
items: FORAMINIFERAL STUDY OF NKPORO SHALE EXPOSURES, CALABAR FLANK (SE NIGERIA): AGE AND DEPOSITIONAL ENVIRONMENT
items: SOIL EROSION RISK ASSESSMENT DUE TO LAND USE/LAND COVER CHANGES (LULC) IN HANGAR RIVER WATERSHED, NORTHWEST ETHIOPIA
items: EVALUATION OF CONTAMINATION BY POTENTIALLY TOXIC ELEMENTS (PTE) OF SEDIMENTS AROUND THE PETROLEUM TERMINAL PIPELINE “DUTOS E TERMINAIS DO CENTRO SUL (DTCS)”, SP, BRAZIL
items: THE IMPRINT OF THE GEOLOGICAL INHERITANCE AND PRESENT DYNAMICS ON URUGUAYAN INNER SHELF SEDIMENTS (SOUTH-WESTERN ATLANTIC)
items: STUDY OF THE KARST PROCESS DYNAMICS IN KHÓZUÈ: CALCAREOUS MASSIF OF CHERINGOMA PLATEAU (MOZAMBIQUE)
items: SPATIAL DISTRIBUTION OF SOIL LOSS IN UPPER DIDESSA WATERSHED, ETHIOPIA
items: INFLUENCE OF SOIL TYPE IN STREAM FLOW AND RUNOFF MODELED FOR THE UPPER DIDESSA CATCHMENT SOUTHWEST ETHIOPIA USING SWAT MODEL
items: INFLUENCE OF PHOSPHORUS-CONTAMINATED SEDIMENTS IN THE ABUNDANCE OF POTENTIALLY TOXIC PHYTOPLANKTON ALONG THE SFAX COASTS (GULF OF GABES, TUNISIA)
items: UNRAVELING MAGMATIC ACTIVITY IN SEDIMENTARY BASINS: SILLS AND RELATED BRITTLE STRUCTURES AFFECTING CAMPOS BASIN PETROLEUM SYSTEM (SE BRAZIL)
items: IMPACT OF EUTROPHICATION ON BENTHIC FORAMINIFERA IN SEPETIBA BAY (RIO DE JANEIRO STATE, SE BRAZIL)
items: LITHOSTRATIGRAPHIC CONTROL OF THE CANGAS-POCONÉ LINEAMENT AURIFEROUS DEPOSITS (PARAGUAY BELT): IMPLICATIONS FOR REGIONAL EXPLORATION
items: MARINE TRANSGRESSION RECORDS IN THE SEPETIBA BAY REGION (RJ-BRAZIL) BY GPR AND GROUND MAGNETIC SURVEY

EVALUATION OF THE BEST-FIT PROBABILITY OF DISTRIBUTION AND RETURN PERIODS OF RIVER DISCHARGE PEAKS. CASE STUDY: AWETU RIVER, JIMMA, ETHIOPIA
type: item
description: The identification of the best distribution function is essential to estimate a river peak discharge or magnitude of river floods for management of watershed and ecosystems. However, inadequate estimation of the river peak discharge and floods magnitude may decrease the efficiency of water-resources management, resulting in soil erosion, landslides, environmental damage and ecosystem degradation. To overcome this problem in hydrology, different methods have been employed, applying a probability distribution. In this study to determine the suitable probability of distribution for estimating the annual discharge series with different return periods, the annual mean and peak discharges of the Awetu River (Jimma, Ethiopia) over a 24 years’ time period have been collected and used. After the homogeneity and consistency test, data were analyzed to predict extreme values and were applied in seven different probability distribution functions by using L-moment and easy fit methods. Then, three goodness of fit tests, Anderson-Darling (AD), Kolmogorov-Smirnov (KS), and Chi-Squared (x2) tests, were used to select the best probability distribution function for the study area. The obtained results indicate that, Log-normal distribution function is the best-fit distribution to estimate the peak discharge recurrence of the Awetu River. The 5-year, 10-year, 25-year, 50-year, 100-year and 1000-year return periods of discharge were calculated for this river. The results of this study are useful for the development of more accurate models of flooding inundation and hazard analysis. AVALIAÇÃO DA MELHOR PROBABILIDADE DE AJUSTE DE DISTRIBUIÇÃO E PERÍODOS DE RETORNO DOS PICOS DE DESCARGA FLUVIAL. ESTUDO DE CASO: AWETU RIVER, JIMMA, ETIÓPIA Resumo Avaliação da melhor função de probabilidade de distribuição e de períodos de retorno de picos de descarga de rio. Estudo de caso: Rio Awetu, Jimma, Etiópia. A identificação da melhor função de distribuição é essencial para estimar um pico de desca…
creator: Tolera Abdisa Feyissa
creator: Nasir Gebi Tukura
rights: Copyright (c) 2019 Journal of Sedimentary Environments
date: 2019-10-25
publication date: 2019-10-25
starting page: 361
ending page: 368
doi: 10.12957/jse.2019.46128

FORAMINIFERAL STUDY OF NKPORO SHALE EXPOSURES, CALABAR FLANK (SE NIGERIA): AGE AND DEPOSITIONAL ENVIRONMENT
type: item
description: Foraminiferal analysis of the sedimentary deposits of Nkporo shale exposed at PAMOL along Calabar/Odukpani Road, in the Calabar Flank, Southeastern Nigeria, was investigated in order to determine its geological age and paleoenvironmental conditions. The lithology is predominantly composed by shale with traces of siltstone and sandstone. Shale is generally light to dark grey, occasionally light brown, sub-fissile to fissile, moderately hard, carbonaceous, and slightly ferruginous. Results of foraminiferal analysis showed that the samples consist predominantly of arenaceous/agglutinated benthic foraminifera. Calcareous planktic foraminifera are absence and calcareous benthic taxa are almost absence of calcareous. The occurrence of the following foraminifera taxa Ammobaculite sp., Haplophragmoides sahariense, Haplophragmoides talokaense, Trochammina sp., Trochammina dustuna, Ammobaculites amabensis and Bolivina sp. suggest that sediments in the study area were deposited during the Maastrichtian age. The paleo-depositional-environment should occur in transitional marine settings, probably a marsh/lagoon. In the study area, calm hydrodynamic conditions prevailed. They favored the accumulation of fine-grained sediment and organic matter which gave rise to oxygen scarcity. The environment would be stressful for benthic foraminifera not only because of oxygen scarcity but also due to the variability of water salinity (hypo to hypersaline). ESTUDO DE FORAMINÍFEROS DOS FOLHELHOS DE NKORHO, CALABAR FLANK (SE DA NIGERIA): IDADE E AMBIENTE DEPOSICIONAL Resumo A análise de foraminíferos dos depósitos sedimentares do folhelho Nkporo expostos em PAMOL ao longo da estrada de Calabar/Odukpani, em Calabar Flank, sudeste da Nigéria, foi estudada tendo em vista determinar sua idade relativa e condições paleoambientais. A litologia é predominantemente composta por folhelho com camadas de siltito e arenito. O folhelho é, em geral, cinza claro a escuro, ocasionalmente marrom claro, sub-fís…
creator: Asukwo Essien Itam
creator: Victoria Inyang Emeka
creator: Chimezie Ndunagum Emeka
rights: Copyright (c) 2019 Journal of Sedimentary Environments
date: 2019-10-25
publication date: 2019-10-25
starting page: 369
ending page: 378
doi: 10.12957/jse.2019.46129

SOIL EROSION RISK ASSESSMENT DUE TO LAND USE/LAND COVER CHANGES (LULC) IN HANGAR RIVER WATERSHED, NORTHWEST ETHIOPIA
type: item
description: Soil erosion is a major environmental and economic concern affecting all continents around the world. Soil loss facilitates land degradation, threatening both agricultural and natural environments. This problem is severe in Ethiopia due to its topographic features. To evaluate the effect of land use and land cover changes on soil erosion, we studied land use changes of the Hanger River watershed, NW Ethiopia, from 2005 to 2017, using remote sensing and estimating soil erosion using the Revised Universal Soil Loss Equation. The results of land-cover changes have revealed a decrease in open forest areas, grazing land, shrub land and grass land by 33.16%, 9.20 %, 3.22 %, and 7.62 %, respectively in a fourteen years period. In the same period, there was an increase in agricultural areas by 48.73 % and dense forest by 4.74 %. The estimated mean soil erosion potential in Hanger River watershed, between 2005 and 2017, was about 55.5 and 70.5 t ha-1 year-1, respectively. For the High and Very high classes, the values increased from 33.40% to 35.74% and 6.36% to 12.81%, respectively from 2005 to 2017. Therefore, it can be concluded that there is an increasing tendency for soil erosion in the area due to changes in land cover, particularly deforestation due to agricultural land expansion. This trend should receive attention aiming to keep the stability and sustainability of this ecosystem in the future. Management interventions are necessary to improve the status and utilization of watershed resources by applying sustainable land management practices for sustainable livelihood of the local people. AVALIAÇÃO DE RISCOS DE EROSÃO DO SOLO DEVIDO A ALTERAÇÕES DO USO DO SOLO/ COBERTURA DO SOLO (LULC), NA BACIA DO RIO HANGAR, NOROESTE DA ETIÓPIA Resumo A erosão do solo suscita uma grande preocupação ambiental e econômica e afeta todos os continentes. A perda de solo facilita a degradação da terra, ameaçando ambientes agrícolas e naturais. Este problema é grave na Etiópia devido às s…
creator: Nasir Gebi Tukura
creator: Mahmud Mustefa Akalu
rights: Copyright (c) 2019 Journal of Sedimentary Environments
date: 2010-11-08
publication date: 2010-11-08
starting page: 379
ending page: 386
doi: 10.12957/jse.2019.46538

EVALUATION OF CONTAMINATION BY POTENTIALLY TOXIC ELEMENTS (PTE) OF SEDIMENTS AROUND THE PETROLEUM TERMINAL PIPELINE “DUTOS E TERMINAIS DO CENTRO SUL (DTCS)”, SP, BRAZIL
type: item
description: The Petroleum Terminal Pipeline “Dutos e Terminais do Centro Sul (DTCS)” is one of the largest petroleum terminals in Brazil. To assess wastewater treatment efficiency of the DTCS and to evaluate the contamination by potentially toxic elements (PTE) of sediments, ten sampling points were studied near the riser output of the submarine outfall in the summer of 2005, 2006 and 2007, and ten sampling points were studied along the São Sebastião Channel (CSS). All data were above the standards required by the Brazilian salt water/brackish Water Directives (CONAMA Resolution 454/2012). However, the sediments near the submarine outfall were enriched by As and Cu, with concentrations exceeding the threshold effect level (TEL). In 2005 and 2006, the concentrations of Ba, Sr, Ni and Pb exceeded the values established by TEL in some places. Concentrations of As were 69 times higher than that measured in the background station. In 2007, all the analyzed metals almost doubled the concentrations of that found in 2005. High concentrations of PTE in the sediments, namely Ba and As, are a source of contamination that should be considered for the water quality management planning of the DTCS system. Avaliação da Contaminação por Elementos Químicos Potencialmente Tóxicos (PTE) dos Sedimentos da Região do Terminal Petrolífero “Dutos e Terminais do Centro Sul (DTCS)”, SP, Brasil Resumo O Terminal Petrolífero “Dutos e Terminais do Centro Sul (DTCS)”, SP, Brasil é um dos maiores terminais de petróleo do Brasil. Para avaliar a eficiência do tratamento de águas residuais do DTCS e estimar a contaminação por elementos potencialmente tóxicos (PTE) dos sedimentos, foram estudados dez pontos de amostragem perto da saída do ducto submarino no verão de 2005, 2006 e 2007 e dez pontos de amostragem ao longo do Canal de São Sebastião (CSS). Todos os dados estavam acima dos padrões exigidos pelas Diretrizes Brasileiras para Águas Salgadas/Salobras (Resolução CONAMA 454/2012). No entanto, os sedimentos …
creator: Wânia Duleba
creator: Silas Gubitoso
creator: Maria Virgínia Alves Martins
creator: Andreia Cristiane Teodoro
creator: Leonardo Antonio Pregnolato
creator: Silvio Miranda Prada
rights: Copyright (c) 2019 Journal of Sedimentary Environments
date: 2019-11-08
publication date: 2019-11-08
starting page: 387
ending page: 402
doi: 10.12957/jse.2019.46539

THE IMPRINT OF THE GEOLOGICAL INHERITANCE AND PRESENT DYNAMICS ON URUGUAYAN INNER SHELF SEDIMENTS (SOUTH-WESTERN ATLANTIC)
type: item
description: The Uruguayan continental shelf is characterised by a unique hydrographic system, composed of the Río de la Plata buoyant plume (RdlP-BP), and by water masses of contrasting thermohaline characteristics. Below the RdlP-BP the southward-flowing Subtropical Shelf Water and the northward-flowing Subantarctic Shelf Water converge at the Subtropical Shelf Front, which is the shelf extension of the Brazil-Malvinas Confluence. Three main sedimentary environments can be described associated with; I) “Atlantic coastal sands” (i.e. onshore from the palaeovalley); II) the SW-NE running “RdlP palaeovalley” and; III) “Relict sands” (i.e., offshore of the RdlP palaeovalley). Three exposed sedimentary units (U1 to U3) identified from acoustic profiles and sediment cores (sedimentary characteristics of stratigraphic units) almost entirely restricted to the palaeovalley. The transect here studied intersects these three environments contributing thus with the description of the morphological setting and sedimentary coverture. Physical and geochemical data were integrated and used to characterise the sedimentary facies previously described in the inner shelf and to understand environmental control on the development of these facies. Sediments from U1 show the terrestrial imprint of the RdlP and drier regional conditions, while sediments that characterised U3 indicate a sandy facies (quartz and bioclasts: whole and fragmented shells and polychaetes tubes) corresponding to an ancient coast. This last (with approximately 11 m height), is probably related to sea-level stabilization, between 20 and 25 m occurring during the Upper Pleistocene and Holocene for the South-Western Atlantic. The sediment from U3 reflects the colder and drier conditions prevailing in the region during the formation of this facies (13.7 and 9.7 cal ka BP). Eroded sediments (e.g., from U3; ancient coast) are deposited inside the palaeovalley and on the onshore region (between the palaeovalley and coastal sands). Al…
creator: Leticia Burone
creator: Paula Franco-Fraguas
creator: Michel Michaelovitch de Mahiques
creator: Nuria Lahuerta
creator: Jorge Rey Diaz de Rada
creator: Matilde Rodríguez
creator: Marcia Caruso Bícego
creator: Yamandú Marín
creator: Mónica Gómez-Erache
creator: Leonardo Ortega
rights: Copyright (c) 2019 Journal of Sedimentary Environments
date: 2019-12-01
publication date: 2019-12-01
starting page: 403
ending page: 420
doi: 10.12957/jse.2019.47021

STUDY OF THE KARST PROCESS DYNAMICS IN KHÓZUÈ: CALCAREOUS MASSIF OF CHERINGOMA PLATEAU (MOZAMBIQUE)
type: item
description: The present research was developed aiming to study macroscopically the effects of karstification that, over the time, affected significantly the carbonated massif in Khózuè, Cheringoma Plateau (Mozambique). The research was carried out from a field study (collecting samples and photos) for a period of one week, in May of 2017, in Khózuè. During the field work, evidences found in nature were recorded as well as, the mode of occurrence of several structures (caves, dolines and speleothems). The karstification in the study area that occurs in the Cheringoma Formation (from Middle Eocene) was greatly conditioned by fractures which influenced the process and formation of caves and dolines. These structures tended to follow morphological patterns depending on guide fractures orientation allied to their genesis and creating, in certain cases, dolines with a cross morphology. In addition to caves and dolines, karstic activity in the Cheringoma Formation massif also created other structures, especially speleothems, which are not widespread, and also preservation/fossilization of plant remains by mineralization. Chemical weathering chemical weathering, but especially internal geodynamic phenomena transformed the Khózuè massif one karst region with peculiar characteristics. Resumo Este trabalho foi desenvolvido com o objetivo de estudar macroscopicamente os efeitos da carstificação que, com o tempo, afetaram significativamente o maciço carbonatado de Khózuè, no platô de Cheringoma (Moçambique). A pesquisa foi realizada a partir de um estudo de campo (coleta de amostras e fotografias), em 2017, em Khózuè. Durante as atividades de campo, foram analisadas as estruturas encontradas na área de estudo, tal como a ocorrência de falhas, cavernas, dolinas e espeleotemas. A carstificação na área de estudo, associada á Formação Cheringoma (do Eoceno Médio), foi muito influenciada por falhas. Estas favoreceram a formação de cavernas e dolinas. Essas estruturas tenderam a assumir padrões m…
creator: Assane Luís Pena
creator: Manuel Jossias Waene
creator: Maria Virginia Alves Martins
rights: Copyright (c) 2019 Journal of Sedimentary Environments
date: 2019-12-01
publication date: 2019-12-01
starting page: 421
ending page: 433
doi: 10.12957/jse.2019.47026

SPATIAL DISTRIBUTION OF SOIL LOSS IN UPPER DIDESSA WATERSHED, ETHIOPIA
type: item
description: Soil erosion is dramatically increasing and accelerating in developing countries like Ethiopia. It has worrisome economic and environmental impacts and causes nutrient loss on agricultural land, sedimentation in rivers and reservoirs, clogged canals and other water supply systems. Determination of spatial distribution of soil loss rate in upper Didessa watershed is an important priority for prioritizing the area for watershed management practices in order to reduce soil erosion. The Revised Universal Soil Loss Equation (RUSLE) framed with geographical information system and remote sensing technique was used to estimate the mean annual soil loss in Upper Didessa Watershed, Ethiopia. Digital elevation model (DEM) with 30mx30m resolution was collected from Ministry of Water, Irrigation and Energy and used to delineate the watershed. Soil loss factors of the watershed like length and slope factor (LS), soil erodibility factor (K), cover management factor (C), support practicing factor (P) and rain fall erosivity factor (R) were evaluated and integrated in GIS to compute the annual soil loss rate of the watershed. The results of this work reveal that the annual rate of soil loss in the watershed is 5.23 t / ha / year. They also show that the central part of the watershed is an area prone to soil erosion. DISTRIBUIÇÃO ESPACIAL DA PERDA DO SOLO NA BACIA HIDROGRÁFICA SUPERIOR DIDESSA, ETIÓPIA Resumo A erosão do solo está aumentando e acelerando dramaticamente em países em desenvolvimento como a Etiópia. Tem impactos econômicos e ambientais preocupantes e causa perda de nutrientes em terras agrícolas, sedimentação em rios e reservatórios, entupimento de canais e outros sistemas de fornecimento de água. A determinação da distribuição espacial da taxa de perda de solo na bacia hidrográfica superior do Rio Didessa é uma prioridade importante para priorizar a área para práticas de manejo de bacias hidrográficas a fim de reduzir a erosão do solo. A Equação Universal de Perda de S…
creator: Fayera Gudu Tufa
creator: Tolera Abdissa Feyissa
rights: Copyright (c) 2019 Journal of Sedimentary Environments
date: 2019-12-13
publication date: 2019-12-13
starting page: 434
ending page: 443
doi: 10.12957/jse.2019.47285

INFLUENCE OF SOIL TYPE IN STREAM FLOW AND RUNOFF MODELED FOR THE UPPER DIDESSA CATCHMENT SOUTHWEST ETHIOPIA USING SWAT MODEL
type: item
description: This study aimed to model the flow of streams and identify the sub-basins responsible for the high flow in the Didessa watershed, southwest Ethiopia, considering the regional soils types. Soil and Water Assessment Tool (SWAT) model was used to simulate stream flow and quantify surface runoff. The input data used were Digital Elevation Model (DEM), land use/land cover map, soil map and metrological data. The data were obtained from Ministry of Water, Irrigation and Electricity and National Meteorology Agency of Ethiopia. Simulation of SWAT was used to identify the most vulnerable sub-basins to the hydrological process. The model was calibrated and validated using the stream flow data. The simulated stream flow was calibrated by the SWAT-CUP2012 calibration sub-model of SWAT-CUP SUFI2. Sensitivity analysis showed that curve numbers (CN2), ALPHA-BNK and CH-K2 are the most sensitive top three parameters. The R2 and Nash-Sutcliffe Efficiency (NSE) values were used to examine the model performance. The results indicate 0.84 and 0.80 for R2 and 0.65 and 0.54 for NSE during calibration and validation, respectively. The average annual surface runoff in the delineated catchment was 774.13 mm. Changes in precipitation explained 89% of the variation in surface runoff, as more than 89% of precipitation from the catchment converted to surface runoff. The most three annual surface runoffs contributing were the 11, 23 and 5 sub-basins. INFLUÊNCIA DO TIPO DE SOLO NO FLUXO DE CÓRREGOS PARA A BACIA SUPERIOR DO RIO DIDESSA, SUDOESTE DA ETIÓPIA UTILIZANDO O MODELO SWAT Resumo Este estudo teve como objetivo modelar o fluxo de córregos e identificar as sub-bacias responsáveis pelo alto fluxo na bacia hidrográfica do Rio Didessa, sudoeste da Etiópia, considerando os tipos de solos regionais. O modelo SWAT (Solo and Water Assessment Tool) foi utilizado para simular o fluxo da corrente e quantificar o escoamento superficial. Os dados de entrada utilizados foram o Modelo Digital de Elevação (…
creator: Adisu Befekadu Kebede
rights: Copyright (c) 2019 Journal of Sedimentary Environments
date: 2019-12-15
publication date: 2019-12-15
starting page: 444
ending page: 457
doi: 10.12957/jse.2019.47322

INFLUENCE OF PHOSPHORUS-CONTAMINATED SEDIMENTS IN THE ABUNDANCE OF POTENTIALLY TOXIC PHYTOPLANKTON ALONG THE SFAX COASTS (GULF OF GABES, TUNISIA)
type: item
description: This is the first work performed in the shellfish production area located along the Sfax coasts (southern Tunisia) on the spatial and temporal patterns of toxic phytoplankton. It relates the excessive introduction of phosphorus in coastal waters from sediments contaminated with that nutrient. A multivariate approach was applyed using data derived from the National Phytoplankton Monitoring Program (REPHY) (2006-2009). We also examine if there is a direct relationship between the abundance of toxic phytoplankton and physical and chemical parameters. This study is based on phytoplankton composition and abundance, as well as physical and chemical data to evaluate the ecological status of the Sfax coasts, at shellfish farms. A total of 13 taxa included in the Intergovernmental Oceanographic Commission (IOC) toxic algae checklist and well-known bloom formers were identified in REPHY. Higher nutrient spring samples were distinguished from those of lower nutrient summer waters. The Redundancy Analysis (RDA) separated the toxic species into two groups related to nutrients availability. The large amounts of phosphorus and organic matter affected the toxic phytoplankton structure, due to the pollution of chemical origin underlining an organic load hardly biodegradable in Sfax coasts. Many of these species recorded in the water column were benthic dinoflagellates, a fact that could be explained by the resuspension of these organisms by hydrodynamics. The knowledge obtained in this study can be used to develop best management practices of the sediment compartment as well as the water column, which is crucial in the framework of any phytoplankton monitoring program. INFLUÊNCIA DE SEDIMENTOS CONTAMINADOS POR FÓSFORO NA ABUNDÂNCIA DE FITOPLANCTÔNPOTENCIALMENTE TÓXICO NAS COSTAS DE SFAX (GOLFO DE GABES, TUNÍSIA) Resumo Este é o primeiro trabalho realizado na área de produção de moluscos, situada ao longo das costas de Sfax (sul da Tunísia) que relaciona os padrões espaciais e tempor…
creator: Wafa Feki-Sahnoun
creator: Hasna Njah
creator: Nouha Barraj
creator: Mabrouka Mahfoudi
creator: Fourat Akrout
creator: Ahmed Rebai
creator: Malika Bel Hassen
creator: Asma Hamza
rights: Copyright (c) 2019 Journal of Sedimentary Environments
date: 2019-12-15
publication date: 2019-12-15
starting page: 458
ending page: 470
doi: 10.12957/jse.2019.47324

UNRAVELING MAGMATIC ACTIVITY IN SEDIMENTARY BASINS: SILLS AND RELATED BRITTLE STRUCTURES AFFECTING CAMPOS BASIN PETROLEUM SYSTEM (SE BRAZIL)
type: item
description: Historically, volcanic basins have been avoided by oil and gas companies for hydrocarbon exploration, due to high rates of unsuccessful cases, mainly when magmatic suites were unexpected. Furthermore, igneous rocks have always been considered harmful to petroleum systems. However, in the past two decades, researches regarding these systems in volcanic basins have shown a number of positive effects, as increasing permeability of tight rocks, and generation of traps. This work aims to investigate the occurrence and impacts of igneous intrusions on sedimentary basins regarding the reservoir and trap elements. For that, we use eight 2D seismic lines and five wells within the Papa-Terra field, southern Campos Basin, Brazil. Applying seismic stratigraphy, nineteen sills were identified, most of them have saucer-shaped geometries, but they are also planar. We have identified some possible joint connections in the NW sill complex, as well as a possible feeder dyke. Five sills are located right below two domal structures in the overburden, which were interpreted as forced-folds. There are fractures interpreted in the sills’ boundaries and in folded sediments. Some of the fractures in the sills boundaries were interpreted as hydrothermal vents that were active until Upper Cretaceous. The contribution of this study is a documentation of an offshore volcanic basin related to a proven petroleum system in the south Atlantic, which has been neglected by Brazilian researchers over the years. ATIVIDADE MAGMÁTICA EM BACIAS SEDIMENTARES: SOLEIRAS E FALHAS ASSOCIADAS QUE AFETAM O SISTEMA PETROLÍFERO DA BACIA DE CAMPOS (SE BRASIL) Resumo Historicamente, as empresas de petróleo e gás evitam efectuar propecção de hidrocarbonetos em bacias afetadas por vulcanismo, devido a elevadas taxas de insucesso, principalmente quando os pacotes magmáticos são inesperados. Além disso, as intrusões de rochas ígneas sempre foram consideradas prejudiciais aos sistemas petrolíferos. No entanto, nas última…
creator: Gabriela de Oliveira Avellar
creator: Egberto Pereira
rights: Copyright (c) 2019 Journal of Sedimentary Environments
date: 2019-12-15
publication date: 2019-12-15
starting page: 471
ending page: 479
doi: 10.12957/jse.2019.47326

IMPACT OF EUTROPHICATION ON BENTHIC FORAMINIFERA IN SEPETIBA BAY (RIO DE JANEIRO STATE, SE BRAZIL)
type: item
description: The main objective of this work is to analyze the consequences of eutrophication in benthic meiofaunal organisms (foraminifera) in an internal area of Sepetiba Bay (State of Rio de Janeiro, SE, Brazil). This study is interesting because, at the studied site, the sediments corresponding to the period of greatest accumulation of organic matter were not contaminated by metals, although Sepetiba Bay has areas known to be polluted by this type of contaminants. Thus, in this study, it was possible to consider only the impact caused by eutrophication. In the SP6 core, collected in the Sepetiba Bay internal area and studied in this work, textural, geochemical (concentration of chemical elements; 210Pb and 137Cs; radiocarbon data) and foraminifera were analyzed in a muddy section, with a few intercalations of sandy layers. The sediments of the analyzed section were deposited in the last ≈2,350 BP years. The concentrations of Al, Cd, Co, Fe, Mn, Ni, Pb, Sn, Ti, V and Zn are higher at the base of the core and decrease towards the top. The contents of TOC, P and Zr have inverse paterns. The ratios of these elements to their background value have similar patterns. However, previous studies have recognized that during the twentieth century Cd, Zn, Cr and Pb concentrations increased in several areas of Sepetiba Bay, mainly due to industrial activity. The area where this core was collected may have been dredged. Radiocarbon ages suggest a loss of ≈2000 years of sedimentary registration, marked by an unconformity at a depth of 126 cm, probably caused by dredging. A new sedimentary sequence unpolluted by metals but highly enriched in organic matter was deposited on the surface of that discontinuity. Foraminifera were quite abundants in the lower section (240-126 cm; between ≈2,400-2,090 years BP, execept in the sandy layers), corresponding to sediment deposition before dredging. After dredging, the accumulation of very fine-grained sediments rich in organic matter generated eutrophic…
creator: Maria Virgínia Alves Martins
creator: Egberto Pereira
creator: Rubens Cesar Lopes Figueira
creator: Thales Oliveira
creator: Anita Fernandes Souza Pinto Simon
creator: Denise Terroso
creator: José Carlos Martins Ramalho
creator: Layla Silva
creator: Carolina Ferreira
creator: Mauro César Geraldes
creator: Wania Duleba
creator: Fernando Rocha
creator: Maria Antonieta Rodrigues
rights: Copyright (c) 2019 Journal of Sedimentary Environments
date: 2019-12-15
publication date: 2019-12-15
starting page: 480
ending page: 500
doi: 10.12957/jse.2019.47327

LITHOSTRATIGRAPHIC CONTROL OF THE CANGAS-POCONÉ LINEAMENT AURIFEROUS DEPOSITS (PARAGUAY BELT): IMPLICATIONS FOR REGIONAL EXPLORATION
type: item
description: rocks of the Cuiaba Group, into the inner portion of the Paraguay Belt (Brazil). They occur in a belt (~1200 m) where the host rocks are graphitic phyllites, metadiamictites, metasiltites and sandstones metamorphosed in greenschist facies. In these deposits gold occurs free or included in pyrite related to three types of quartz veins, parallel to Sn (V1), parallel to Sn+1 (V2) and orthogonal (V3) which are rich in gold. The study of outcrops in regional profiles, open mines for gold exploration and drilling holes in the Cangas-Poconé alignment indicate that the preferential location of gold mineralization at (Cangas Facies) is related to the existence of strong lithological control of the mineralizations. The Cangas facies present low permeability of rhythmite, structural arrangement of permeability barriers S0 and S1 at high angle with respect to the fluid migration path and mainly the presence of ferruginous levels acting as geochemical barriers for precipitation of metals in solution in the fluid. The knowledge that gold concentration is related to sedimentary control is important for regional exploration and is a guide for local miners. CONTROLE LITOSTRATIGRÁFICO DOS DEPÓSITOS AURÍFEROS DO LINEAMENTO CANGAS-POCONÉ (CINTURÃO PARAGUAI): IMPLICAÇÕES PARA A EXPLORAÇÃO REGIONAL Resumo Os depósitos de Cangas-Poconé estão hospedados em rochas metassedimentares do Grupo Cuiabá, na porção interna do Cinturão do Paraguai (Brasil). Eles ocorrem em um cinturão (~ 1200 m), onde as rochas hospedeiras são filitos, metadiamictitos, metasiltitos e arenitos grafitados, metamorfoseados em fácies de xisto verde. Nesses depósitos, o ouro ocorre livre ou incluído em pirita relacionada a três tipos de veios de quartzo. O estudo de afloramentos em perfis regionais, minas abertas para exploração de ouro e perfurações no alinhamento Cangas-Poconé indica que a localização preferencial da mineralização de ouro em (Cangas Facies) está relacionada à existência de forte controle litológico. O…
creator: Raíza de Sousa Batalha
creator: Elzio da Silva Barboza
creator: Carlos Humberto
creator: Cláudia do Couto Tokashiki
creator: Francisco Egídio Cavalcante Pinho
creator: Mauro César Geraldes
rights: Copyright (c) 2019 Journal of Sedimentary Environments
date: 2019-12-15
publication date: 2019-12-15
starting page: 501
ending page: 517
doi: 10.12957/jse.2019.47328

MARINE TRANSGRESSION RECORDS IN THE SEPETIBA BAY REGION (RJ-BRAZIL) BY GPR AND GROUND MAGNETIC SURVEY
type: item
description: This work aims to identify sedimentary and basal rocks structures in the Sepetiba Bay Basin (Rio de Janeiro State, SE Brazil) located in the western portion of Guanabara Graben formed during the course of Paleocene tectonic activity. Two distinct geophysical tools were used to investigate the geological records by the integration of geological survey and geophysical data: Ground-penetrating radar (GPR) and Ground Magnetic survey. GPR results allowed to interpret and delimit subsurface layers of the basin. It was observed in the analyzed all sections, that the most superficial layers of the radargrams (about 8 meters; with Radar 100 Mhz) the presence of clay and silty sediment layers, related to a calm depositional environment and below 8 m sandy layers related to more energetic depositional environment were found. These sedimentological changes should be influenced by sea level oscillations and marine transgressions in this area. Magnetic ground survey allowed to identify basement rocks of the Sepetiba Bay Basin and to confirm the event of sea level rise. REGISTROS DE TRANSGRESSÃO MARINHA NA REGIÃO DE SEPETIBA BAY (RJ-BRASIL). PESQUISA COM GPR E MAGNÉTICA EM TERRA Resumo Este trabalho tem como objetivo identificar estruturas de rochas sedimentares e basais na Bacia da Baía de Sepetiba (Estado do Rio de Janeiro, SE Brasil), localizada na porção oeste da Guanabara Graben, formada durante o curso da atividade tectônica do Paleoceno. Duas ferramentas geofísicas distintas foram usadas para investigar os registros geológicos pela integração do levantamento geológico e dos dados geofísicos: GPR e levantamento magnético do solo. Os resultados do GPR permitiram interpretar e delimitar as camadas subterrâneas da bacia. Observou-se nas seções analisadas, que nas camadas mais superficiais dos radargramas (cerca de 8 metros; com Radar 100 Mhz) a presença de camadas de argila e sedimentos sedimentares, relacionadas a um ambiente deposicional calmo e abaixo de 8 m de camadas areno…
creator: Dione Nunes do Nascimento
creator: Marcelo dos Santos Salomão
creator: Miguel Angelo Mane
creator: Mauro Cesar Geraldes
creator: Ciro Appi
creator: Maria Virginia Alves Martins
rights: Copyright (c) 2019 Journal of Sedimentary Environments
date: 2019-12-16
publication date: 2019-12-16
starting page: 518
ending page: 539
doi: 10.12957/jse.2019.47382