Cuando el narrador escucha. Sobre la presencia de la música en los textos críticos y narrativos de Marcelo Cohen (1973-2008)

Fil: Chiani, Miriam Neri. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

Censura a los libros en la ciudad de La Plata durante la última dictadura militar (1976-1983) : Una experiencia de investigación

Con el advenimiento de la democracia, en el año 1983, las investigaciones sobre el pasado reciente se multiplicaron. Sin embargo, la urgencia por saber qué pasó con los desaparecidos, hizo que los trabajos sobre memoricidios y otras experiencias en los ámbitos educativo y cultural se vieran relegadas (salvo excepciones e investigaciones aisladas). En el año 2006, la conmemoración de los treinta años del golpe cívico militar, invitó a la reflexión profunda, ampliando el campo de estudio más allá de los desaparecidos, las torturas, los campos de concentración. En el convencimiento de que los bibliotecarios somos actores fundamentales para el cumplimiento del artículo 19 de la Declaración Universal de los Derechos Humanos, la intención al realizar esta tesina fue brindar un espacio de reflexión basado fundamentalmente en los relatos y experiencias de actores educativos y culturales relacionados con el ámbito del libro en la ciudad de La Plata. En esta exposición se comentarán las experiencias durante el proceso investigativo, las dificultades que supone trabajar con el pasado reciente, las metodologías implementadas y los resultados obtenidos a partir de la realización de esta investigación.

Petrography and geochemistry of organic matter in Triassic and Cretaceous sediments from the Wombat and Exmouth Plateau

Triassic (Carnian-Rhaetian) continental margin sediments from the Wombat Plateau off northwest Australia (Sites 759, 760, 761, and 764) contain mainly detrital organic matter of terrestrial higher plant origin. Although deposited in a nearshore deltaic environment, little liptinitic material was preserved. The dominant vitrinites and inertinites are hydrogen-lean, and the small quantities of extractable bitumen contain w-alkanes and bacterial hopanoid hydrocarbons as the most dominant single gas-chromatography-amenable compounds. Lower Cretaceous sediments on the central Exmouth Plateau (Sites 762 and 763) farther south in general have an organic matter composition similar to that in the Wombat Plateau sediments with the exception of a smaller particle size of vitrinites and inertinites, indicating more distal transport and probably deposition in deeper water. Nevertheless, organic matter preservation is slightly better than in the Triassic sediments. Long-chain fatty acids, as well as aliphatic ketones and alcohols, are common constituents in the Lower Cretaceous sediments in addition to n-alkanes and hopanoid hydrocarbons. Thin, black shale layers at the Cenomanian/Turonian boundary, although present at several sites (Sites 762 and 763 on the Exmouth Plateau, Site 765 in the Argo Abyssal Plain, and Site 766 on the continental margin of the Gascoyne Abyssal Plain), are particularly enriched in organic matter only at Site 763 (up to 26%). These organic-matter-rich layers contain mainly bituminite of probable fecal-pellet origin. Considering the high organic carbon content, the moderate hydrogen indices of 350-450 milligrams of hydrocarbon-type material per gram of Corg, the maceral composition, and the low sedimentation rates in the middle Cretaceous, we suggest that these black shales were accumulated in an area of oxygen-depleted bottom-water mass (oceanwide reduced circulation?) underlying an oxygen-rich water column (in which most of the primary biomass other than fecal pellets is destroyed) and a zone of relatively high bioproductivity. Differences in organic matter accumulation at the Cenomanian/Turonian boundary at different sites off northwest Australia are ascribed to regional variations in primary bioproductivity.

Late Triassic palynology of the Wombat Plateau, northwestern Australia

Cores from Leg 122, Sites 759, 760, 761, and 764, were sampled at intervals of one sample per 1.5-m section in the Upper Triassic sequences. Spores, pollen, acritarchs, freshwater algae, and dinoflagellate cysts were studied to establish a palynostratigraphic framework for the Late Triassic. The palynological sequence is interpreted in terms of Australian spore-pollen zones: the Carman Samaropollenites speciosus Zone, the Norian Minutosaccus crenulatus Zone, and the Rhaetian Ashmoripollis reducta Zone. The Samaropollenites speciosus Zone-Minutosaccus crenulatus Zone boundary is marked by the change of pollen abundance and has a gradual character. Therefore, a transitional uppermost Carnian to Norian Samaropollenites speciosus/Minutosaccus crenulatus Zone is used. Age-determining dinoflagellate cysts are present in the Norian and Rhaetian sediments.