992 resultados para ogt 719


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Fil: Gavilán, Mirta Graciela. Universidad Nacional de La Plata. Facultad de Psicología; Argentina.

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The carbonate cements found in Sites 717-719 of ODP Leg 116 correspond to the precipitation of inorganic calcite due to circulation of hot fluid associated with intraplate deformation in the central Indian Ocean. A first burst of hydrothermal activity may have occurred 7.5-9 Ma and a second burst less than 0.5 Ma. These fluids were probably derived from the basaltic basement and the immediately overlying sediments.

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Fil: Jumar, Fernando. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

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Ocean Drilling Program (ODP) Leg 116 cored the distal part of the Bengal Fan at three closely spaced sites (717-719). The recovered sediments consisted dominantly of turbidites that varied in thickness between a few centimeters and 2 m or more. A number of different facies have been identified in the sequence and are described by Stow et al. (1990, doi:10.2973/odp.proc.sr.116.110.1990). Representative examples of these facies types were selected and sampled for grain-size analysis. The results of these analyses are tabulated in this data report.

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Este trabajo intenta abordar el interrogante que refiere a la dinámica que asume la lucha de la clase obrera en la Argentina de la década del noventa. Es decir, se propone observar las respuestas de la clase trabajadora -ocupada y desocupada- a las condiciones que presenta la ofensiva capitalista y la reestructuración social, en relación al modo de acumulación neoliberal y a las configuraciones particulares que asume el Estado en ese período histórico. Ahora bien, estas respuestas han sido objeto de observación desde una variada producción intelectual sobre la cual este trabajo se centrará. De esta manera, intentamos recuperar críticamente las categorías analíticas sobre dichos procesos que algunos de los investigadores más importantes del campo han desarrollado. En este sentido, es necesario analizar la acumulación capitalista, la forma que adopta el Estado y la dinámica de las luchas obreras, como dimensiones de unas mismas relaciones sociales capitalistas. Este trabajo intentará aproximarse a la determinación histórica específica que estos conceptos expresan analizándolos en el caso argentino en la década del noventa en particular. Y esta relación no es posible pensarla escindida de la relación básica de funcionamiento del capitalismo, la relación capital-trabajo

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Fil: Jumar, Fernando. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

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Nineteen trace elements, including seven rare earth elements (REE's), and 10 major and minor elements in 76 sediment samples from Sites 798 (Oki Ridge) and 799 (Yamato Trough) were determined by means of instrumental neutron activation analysis and X-ray fluorescence spectrometry. Most REE patterns (chondrite-normalized) of the sediments from both sites were nearly identical to the patterns of terrigenous materials. The cerium anomaly (slightly positive) frequently appeared in REE patterns of the sediments (200-750 mbsf) from Site 799. Cerium may be selectively incorporated into the sediments with hydrogenous manganese precipitation. However, the degree of the anomaly was not well correlated with manganese content, suggesting that cerium may behave as a trivalent REE (like the other REE's) during diagenesis while manganese is transported in the sediment column accompanied by reduction to a lower oxidation state. The Th/Sc ratio of the sediments from Sites 798 and 799 tended to decrease with penetration depth. Such a depth profile may indicate a decrease in basic volcanism activities from the Pliocene (Site 798) and Miocene (Site 799). The La/Yb ratio and degree of europium anomaly also varied with depth, which may imply that two or more components with different REE patterns were supplied throughout sedimentation at sites in the Japan Sea.