Distinct expressions of the BSR using various frequencies offshore Uruguay and its correspondence with the gas hydrate stability zone

At the Uruguayan continental margin, seismic evidence for the occurrence of gas hydrate has been identified based on the presence of BSRs in densely spaced 2D reflection seismic sections from different surveys. Mapping of BSRs based on 2D seismic data acquired in 2007 and 2008 suggested the presence of gas hydrates in areas that were not previously identified; hence hydrate occurrence offshore Uruguay is more widespread than previously thought. Recently ANCAP has digitized offshore seismic data acquired between 1970 and 1982. Being able to work on this data using interpretation software, and integrating results with the latest interpretations performed on the seismic collected in 2007 and 2008, the BSR extends over an area of approximately 25.000 km2. It is present in water depths greater than 500 m and has high continuity in Pelotas Basin but is more discontinuous at Punta del Este Basin and southern part of Oriental del Plata Basin. In offshore basins around the world the base of GHSZ can have different seismic expressions such as continuous, segmented, and high-relief BSRs depending on the stratigraphic, fluid and geothermal setting. Here, we present examples of the influence of the acquisition parameters on the acoustic expression of the BSR, comparing commercial seismic sections acquired for hydrocarbon exploration and high resolution seismic sections acquired during the R/V Meteor Cruise M49/2 in 2001 and R/V Meteor Cruise M78/3a (May - June 2009) using different sources and streamer system. For the different data sets the BSR presents differences regarding its continuity and amplitude strength. In high resolution seismic, enhanced amplitudes and phase reversals are observed for several reflectors while deep penetration seismic shows only one single continuous reflector. This comparison may help to visualize the complexity of the free gas, gas hydrate and stratigraphic system behind the BSR, which is usually masked on low-frequency deep penetration seismic data

Meso-cenozoic depocenters and tectonic features of the Rio de la Plata crystalline basement (Argentina and Uruguay)

En el presente trabajo se describen las características morfotectónicas de los registros sedimentarios meso-cenozoicos dispuestos sobre el basamento del Río de la Plata, localizado entre Argentina y Uruguay. Para su caracterización se interpreta información de subsuelo y se describe la prolongación austral de la cuenca Santa Lucía de Uruguay y su conexión con la cuenca del Salado de Argentina a través de la Fosa de Quilmes. Además, se describe a partir de datos de subsuelo un nuevo depocentro meso-cenozoico denominado Fosa Recalada dispuesto subparalelamente al anterior. Estos volúmenes sedimentarios son muy poco conocidos y están ocultos debajo de una cubierta cuaternaria y de las mismas aguas del Río de la Plata. Para su estudio se realiza un análisis de las correlaciones tecnoestratigráficas de los sectores mejor reconocidos de las cuencas adyacentes Santa Lucía y Salado a partir de la información geofísica regional sísmica y gravimétrica disponible e interpretaciones estructurales dentro del contexto extensional mesozoico relacionado con la apertura atlántica. Se destaca la importancia de estos volúmenes sedimentarios como potenciales reservorios de fluídos (hidrocarburos y aguas subterráneas por su localización estratégica próxima a los grandes conglomerados poblacionales de Buenos Aires y Montevideo.In the present work the morphothectonic characteristics of the Mesozoic to Cenozoic sedimentary records overlying on the Río de la Plata basement, located between Argentina and Uruguay, are described. This characterization is based on the interpretation of subsurface data in the context of the southern extension of the Santa Lucía basin of Uruguay and its connection with the Salado basin of Argentina through the Quilmes trough. In addition, a new Mesozoic to Cenozoic depocenter called Recalada trough oriented subparallel to the previous one is described on the basis of subsurface data. These sedimentary volumes are very little known and are hidden under a quaternary cover and the waters of the Río de la Plata. For their study, atectono stratigraphic correlation analysis of the best recognized sectors of the adjacent Santa Lucia and Salado basins is made supported by available regional seismic and gravimetric geophysical information as well as structural interpretations within the mesozoic extensional tectonic context related to the Atlantic opening. The importance of these sedimentary volumes as potentialreservoirs of fluids (hydocarbons and groundwater) is high lighted because of their strategic location close to large population conglomerates of Buenos Aires and Montevideo

Aula invertida como herramienta para el logro de aprendizaje autónomo en estudiantes universitarios

The research aimed to determine the influence of the flipped classroom as a tool for the achievement of autonomous learning in university students. The type of study that was used was applied and the experimental design of a quasi-experimental sub type. The sample consisted of 73 students distributed in 2 groups of which one was the controlgroup (37) and the other theexperimental group (36), students of both sexes, for which an intentional Non-Probabilistic sampling was used. In relation to the technique, this was the survey as instruments the questionnaire that was applied virtually whichwent through two phases before being applied to the study sample (validity and reliability), in relation to the reliability a value was obtained of 0.864according to KR20.The pre-test results in relation to autonomous learning 38.9% and 43.2% of the students in the control group (CG) andexperimental group (EG) maintain a low level, likewise, 58.3% and 43, 2% present a medium level, for their part, 2.8% of the control group and 13.6% of the experimental group were at the high level. It was concluded thatthe flipped classroom allowsthe student to learn autonomously, incorporating TICas an innovative element in the transformation of the acquisition of new learning in a responsible manner.La investigación tuvo como objetivo determinar la influencia del aula invertida como herramienta para el logro de aprendizaje autónomo en estudiantes universitarios. El tipo de estudio fue aplicada y el diseño experimental de sub tipo cuasi experimental. La muestra estuvo conformada por 73 estudiantes distribuidos en 2 grupos  de los cuales uno fue el grupo control (37) y el otro el grupo experimental (36), estudiantes de ambos sexos, para lo cual se utilizó un muestreo No Probabilístico de tipo intencional. Con relación a la técnica, ésta fue la encuesta como instrumentos el cuestionario que fue aplicado de manera virtual el cual pasó por dos fases antes de ser aplicado a la muestra de estudio (validez y confiabilidad), con relación a la confiabilidad se obtuvo un valor de 0,864 según KR20. Los resultados del pretest en relación con el aprendizaje autónomo un 37,6% y 41,2% de los estudiantes del grupo control (GC) y grupo experimental (GE) mantienen un nivel bajo, asimismo, un 57,1% y 41,5% presentan un nivel medio, por su parte, el 5,3% del grupo control y el 17,3% del grupo experimental se situó en el nivel alto. Se llegó a la conclusión que el aula invertida, permite al estudiante aprender de manera autónoma incorporando las TIC como elemento innovador en la trasformación de la adquisición de los nuevos aprendizajes de manera responsable

Aula invertida como herramienta para el logro de aprendizaje autónomo en estudiantes universitarios

La investigación tuvo como objetivo determinar la influencia del aula invertida como herramienta para el logro de aprendizaje autónomo en estudiantes universitarios. El tipo de estudio fue aplicada y el diseño experimental de sub tipo cuasi experimental. La muestra estuvo conformada por 73 estudiantes distribuidos en 2 grupos  de los cuales uno fue el grupo control (37) y el otro el grupo experimental (36), estudiantes de ambos sexos, para lo cual se utilizó un muestreo No Probabilístico de tipo intencional. Con relación a la técnica, ésta fue la encuesta como instrumentos el cuestionario que fue aplicado de manera virtual el cual pasó por dos fases antes de ser aplicado a la muestra de estudio (validez y confiabilidad), con relación a la confiabilidad se obtuvo un valor de 0,864 según KR20. Los resultados del pretest en relación con el aprendizaje autónomo un 37,6% y 41,2% de los estudiantes del grupo control (GC) y grupo experimental (GE) mantienen un nivel bajo, asimismo, un 57,1% y 41,5% presentan un nivel medio, por su parte, el 5,3% del grupo control y el 17,3% del grupo experimental se situó en el nivel alto. Se llegó a la conclusión que el aula invertida, permite al estudiante aprender de manera autónoma incorporando las TIC como elemento innovador en la trasformación de la adquisición de los nuevos aprendizajes de manera responsable

Análise tectono-estratigráfica das sequências permotriassica e jurocretácea da bacia Chacoparanense Uruguaia (Cuenca Norte)

A Bacia Norte ou Chacoparanense Uruguaia situa-se na região norte do territorio uruguaio e abrange uma área de aproximadamente 90.000 km2. A partir de uma análise estratigrafica e estrutural baseada em dados de superfície e subsuperfície, propõe-se uma coluna estratigráfica de acordo com as novas idades e definições litoestratigráficas, e um novo modelo de evolução tectonossedimentar dessa bacia. O registro Neopaleozóico e Eomesozóico da bacia é composto por duas seqüências estratigráficas limitadas por discordâncias regionais, que constituem dois superciclos de segunda ordem: a Tectonosseqüência Permo-Triássica (Asseliano-Scytiano) e a Tectonosseqüência Juro-Cretácea (Jurássico Médio-Neocomiano). Foi proposta uma nova litoestratigrafia para toda a bacia, redefinindo-se as formações San Gregorio, Tres Islas, Frayle Muerto, Mangrullo, Paso Aguiar, Yaguarí, Buena Vista e Tacuarembó; e definidas três novas unidades litoestratigráficas: as formações Cerro Pelado, Gaspar e Itacumbú. Para cada uma das tectonosseqüências foi definida a evolução do preenchimiento sedimentar, as associações de fácies e os sistemas deposicionais. No Permo-Triássico foram caracterizados quatro ciclos: o ciclo glaciogênico Asseliano-Kunguriano, materializado pelos sistemas Rio Negro e Cuchilla de Guazunambí; o ciclo marinho-deltaico Kunguriano, integrado pelo Sistema Cuchilla de Melo Este; o ciclo transicional-marinho Kazaniano, materializado pelos Sistemas Cañada del Barón e Cuchilla de Matamoros-Mangrullo; e o ciclo flúvio-eólico, do Tatariano-Scythiano, definido pelo Sistema Cuchilla Grande Norte. No superciclo Juro-Cretáceo foram caracterizados dois ciclos vulcanossedimentares de natureza continental: o ciclo flúvio-lacustre, materializado pelo Sistema Itacumbú (Jurássico Médio); e o ciclo lacustre-flúvio-éolico, do Jurássico Superior-Cretáceo Inferior...The Norte or Uruguayan Chacoparanense Basin is placed in the northern region of Uruguay and encloses an area o approximately 90,000 km2. From stratigraphic and structural analyses, based in both surface and subsurface data, a new stratigraphic column according to new concepts and lithostratigraphic definitions is proposed. A new model of tectonic-sedimentary evolution for this basin is also proposed. The Late-Paleozoic and Early- Mesozoic records of the basin is composed by two stratigraphic sequences limited by regional unconformities that represent two supercycles of second order: the Permian - Triassic (Asselian-Scytian) and the Jurassic-Cretaceous (Middle Jurassic -Neocomian) tectosequences. A new lithostratigraphy is proposed for all the basin, where the San Gregorio, Tres Islas, Frayle Muerto, Mangrullo, Paso Aguiar, Yaguarí, Buena Vista and Tacuarembó formations were redefined. Three new lithostratigraphic units were defined as well: Cerro Pelado, Gaspar and Itacumbú formations. For each one of the tectosequences, the evolution of the sedimentary filling, the facies relationship and depositional systems were determined. In the Permian-Triassic one, four cycles had been characterized: the glaciogenic Asselian-Kungurian cycle, materialized by the Rio Negro and Cuchilla de Guazunambí systems; the marine-deltaic Kungurian cycle, integrated by the Cuchilla de Melo Este System; the transitional-marine Kazanian cycle represented by the Cañada del Barón and Cuchilla de Matamoros-Mangrullo systems; and the fluvio-eolian cycle of Tatarian-Scythian age defined by the Cuchilla Grande Norte System. In the supercycle Jurassic- Cretaceous supercycle, two continental volcanic-sedimentary cycles had been characterized: the fluvial-lacustrine Middle Jurassic cycle materialized by the Itacumbú System; and the fluvial-eolian-lacustrine... (Complete abstract, access undermentioned electronic address

Meso-cenozoic depocenters and tectonic features of the Rio de la Plata crystalline basement (Argentina and Uruguay)

En el presente trabajo se describen las características morfotectónicas de los registros sedimentarios meso-cenozoicos dispuestos sobre el basamento del Río de la Plata, localizado entre Argentina y Uruguay. Para su caracterización se interpreta información de subsuelo y se describe la prolongación austral de la cuenca Santa Lucía de Uruguay y su conexión con la cuenca del Salado de Argentina a través de la Fosa de Quilmes. Además, se describe a partir de datos de subsuelo un nuevo depocentro meso-cenozoicodenominadoFosa Recalada dispuesto subparalelamente al anterior. Estos volúmenes sedimentarios son muy poco conocidos y están ocultos debajo de una cubierta cuaternaria y de las mismas aguas del Río de la Plata. Para su estudio se realiza un análisis de las correlaciones tectonoestratigráficas de los sectores mejor reconocidos de las cuencas adyacentes Santa Lucía y Salado a partir de la información geofísica regional sísmica y gravimétrica disponible e interpretaciones estructurales dentro del contexto extensional mesozoico relacionado con la apertura Atlántica. Se destaca la importancia de estos volúmenes sedimentarios como potenciales reservorios de fluidos (hidrocarburos y aguas subterráneas) por su localización estratégica próxima a los grandes conglomerados poblacionales de Buenos Aires y Montevideo.In the present work the morphothectonic characteristics of the Mesozoic to Cenozoic sedimentary records overlying on the Río de la Plata basement, located between Argentina and Uruguay, are described. This characterization is based on the interpretation of subsurface data in the context of the southern extension of the Santa Lucía basin of Uruguay and its connection with the Salado basin of Argentina through the Quilmes trough. In addition, a new Mesozoic to Cenozoic depocenter called Recalada trough oriented subparallel to the previous one is described on the basis of subsurface data. These sedimentary volumes are very little known and are hidden under a quaternary cover and the waters of the Río de la Plata. For their study, atectono stratigraphic correlation analysis of the best recognized sectors of the adjacent Santa Lucia and Salado basins is made supported by available regional seismic and gravimetric geophysical information as well as structural interpretations within the mesozoic extensional tectonic context related to the Atlantic opening. The importance of these sedimentary volumes as potential reservoirs of fluids (hydrocarbons and groundwater) is high lighted because of their strategic location close to large population conglomerates of Buenos Aires and Montevideo.Fil: Rossello, Eduardo Antonio. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Veroslavsky, Gerardo. Universidad de la República; UruguayFil: de Santa Ana, Héctor. Administración Nacional de Combustibles; UruguayFil: Rodríguez, Pablo. Administración Nacional de Combustibles; Urugua

Late Paleozoic tectono-sedimentary evolution of eastern Chaco-Parana Basin (Uruguay, Brazil, Argentina and Paraguay)

Recent surface and subsurface information from the Chaco-Paraná Basin in Argentina, Brazil, Paraguay and Uruguay south of the Asunción Rio Grande Arch allowed proposing a regional tectonic-sedimentary evolution for the Late Paleozoic megasequences. A new stratigraphic column for the Chaco-Paraná Basin is proposed based on the integration of outcrop and well data and 2D seismic surveys. We present updated isopach maps of each of the megasequences. The basin fill can be divided into three megasequences: Devonian (Pragian-Emsian), Late Carboniferous, and Permian (Asselian-Wuchiapingian). These megasequences were deposited under similar paleogeographic conditions, with predominantly marine siliciclastic sedimentation. The provenance areas were located to the east, while the marine domain was located to the west. The Devonian megasequence (~300 m total thickness) is subdivided into three units: the Cerrezuelo, Cordobés and La Paloma formations. Its presence had only been confirmed in the southern region of the study area, but new geophysical data suggest its extension into the western sector. The Late Carboniferous megasequence consists of fluvial and glaciomarine rocks, and includes the San Gregorio and Cerro Pelado formations in Uruguay, and the coeval Itararé Group in Brazil. These units thicken towards the west, where they reach up to 250 m. The Permian megasequence (~1200 m total thickness) is composed, from base to top, of the Tres Islas, Fraile Muerto, Mangrullo, Paso Aguiar, Yaguarí and Buena Vista formations, and correlatable units in the Brazilian sector of the Paraná Basin. Both Devonian and Permian sedimentary successions include marine black shales with high organic matter content. These shales are considered regional potential hydrocarbon sources. The provenance areas of the basin are the Proterozoic and Neoproterozoic-Cambrian basement, associated with the Plata High to the south and the Dom Feliciano High to the east and north, respectively. The basement configuration strongly influenced the distribution, thickness and lithological characteristics of the Late Paleozoic megasequence, as well as the connection between the Chaco-Paraná and Paraná basins. A NNE-SSW fault-bounded depocenter, here named the Central Paranaense Trough, is a remarkable tectonic feature 600 km long, bounded by the NE-SW Lancinha, Taxaquara and Jacutinga dextral strike slip fault zones in the Paraná BasinFil: Veroslavsky, Gerardo. Universidad de la República. Facultad de Ciencias; Uruguay. Programa de Desarrollo de Ciencias Básicas; UruguayFil: Rossello, Eduardo Antonio. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; ArgentinaFil: Lopez Gamundi, Oscar. P1C Consultants; Estados UnidosFil: De Santa Ana, Héctor. Programa de Desarrollo de Ciencias Básicas; Uruguay. Administración Nacional de Combustibles; UruguayFil: Assine, Mario L.. Universidade Estadual Paulista Julio de Mesquita Filho. Faculdade de Engenharia; BrasilFil: Marmisolle, Josefina. Administración Nacional de Combustibles; UruguayFil: Perinotto, Alexandre. Universidade do Sao Paulo. Instituto de Astronomia, Geofísica e Ciências Atmosféricas; Brasi