Conflicto social y guerrilla urbana en los '70 : Los Montoneros vistos desde las fuerzas armadas norteamericanas

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

"LOS QUE LUCHAN Y LOS QUE LLORAN" : Distintas versiones respecto de los orígenes de la lucha armada de los 60 y 70 en la Argentina

Cuando la sociedad se ha desgarrado en su propio seno, ha existido guerra, represión, y terrorismo de Estado, el presente está perturbado y el pasado es recuperado a través de relatos que se enfrentan, se corrigen, entran en conflicto. Las prácticas narrativas establecen relaciones de poder: las que se imponen dan lugar a otras de resistencia, de réplica. En este trabajo abordaremos cómo entran en conflicto las distintas versiones en torno a los orígenes de la guerrilla en la Argentina, a partir de la interpretación de los hechos ocurridos durante la experiencia del Ejército Guerrillero del Pueblo, a fines de 1963 e inicios de 1964

Articulaciones literatura/política en el campo intelectual de los 70. Abordajes de la cultura popular en la revista Crisis (1973-1976)

Profundizaremos en algunos aspectos de la relación literatura/política en el campo intelectual y literario argentino de la década del setenta a través del análisis de un caso particular: los modos de aproximación a la cultura popular y de masas por parte de intelectuales y artistas vinculados a la revista Crisis primera época (1973-1976). Sin perder de vista los debates que atravesaron el campo intelectual del período y los procesos históricos críticos con que estos se vincularon, intentaremos avanzar en la identificación y caracterización de las formas que asumió la crítica cultural en la revista

Paleomagnetic, stable oxygen isotope ratios, and U/Th activities of ODP Site 172-1062

Geomagnetic excursions are recognized as intrinsic features of the Earth's magnetic field. High-resolution records of field behaviour, captured in marine sedimentary cores, present an opportunity to determine the temporal and geometric character of the field during geomagnetic excursions and provide constraints on the mechanisms producing field variability. We present here the highest resolution record yet published of the Blake geomagnetic excursion (~125 ka) measured in three cores from Ocean Drilling Program (ODP) Site 1062 on the Blake-Bahama Outer Ridge. The Blake excursion has a controversial structure and timing but these cores have a sufficiently high sedimentation rate (~10cm/ka) to allow detailed reconstruction of the field behaviour at this site during the excursion. Palaeomagnetic measurements of the cores reveal rapid transitions (<500 yr) between the contemporary stable normal polarity and a completely reversed state of long duration which spans a stratigraphic interval of 0.7 m. We determine the duration of the reversed state during the Blake excursion using oxygen isotope stratigraphy, combined with 230Th excess measurements to assess variations in the sedimentation rates through the sections of interest. This provides an age and duration for the Blake excursion with greater accuracy and with constrained uncertainty. We date the directional excursion as falling between 129 and 122 ka with a duration for the deviation of 6.5±1.3 kyr. The long duration of this interval and the fully reversed field suggest the existence of a pseudo-stable, reversed dipole field component during the excursion and challenge the idea that excursions are always of short duration.

Problemas conceptuales relativos a un momento histórico : Representaciones de la violencia política de los años '70 en el marco social actual (2003-2013)

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

Planktonic foraminifera oxygen isotope and trace metal data ODP Hole 172-1056A, 46-54 ka BP

Salinity increase in the subtropical gyre system may have pre-conditioned the North Atlantic Ocean for a rapid return to stronger overturning circulation and high-latitude warming following meltwater events during the Last Glacial period. Here we investigate the Gulf Stream - subtropical gyre system properties over Dansgaard-Oeschger (DO) cycles 14 to 12, including Heinrich ice-rafting event 5. During the Holocene and Last Glacial Maximum a positive gradient in surface dwelling planktonic foraminifera d18O (Globigerinoides ruber) can be observed between the Gulf Stream and subtropical gyre, due to decreasing temperature, increasing salinity, and a change from summer to year-round occurrence of G. ruber. We assess whether this gradient was a common feature during stadial-interstadial climate oscillations of Marine Isotope Stage 3, by comparing existing G. ruber d18O from ODP Site 1060 (subtropical gyre location) and new data from ODP Site 1056 (Gulf Stream location) between 54 and 46 ka. Our results suggest that this gradient was largely absent during the period studied. During the major warm DO interstadials 14 and 12 we infer a more zonal and wider Gulf Stream, influencing both ODP Sites 1056 and 1060. A Gulf Stream presence during these major interstadials is also suggested by the large vertical d18O gradient between shallow dwelling planktonic foraminifera species, especially G. ruber, and the deep dwelling species Globorotalia inflata at site 1056, which we associate with strong summer stratification and Gulf Stream presence. A major reduction in this vertical d18O gradient from 51 ka until the end of Heinrich event 5 at 48.5 ka suggests site 1056 was situated within the subtropical gyre in this mainly cold period, from which we infer a migration of the Gulf Stream to a position nearer to the continental shelf, indicative of a narrower Gulf Stream with possibly reduced transport.