Mirada metacrítica al género crónica : La construcción de su tradición crítica como puesta en valor

La ponencia propone el análisis de las relecturas críticas que contribuyeron a la construcción del valor literario de formas narrativas hasta los años '80 consideradas periféricas y problemáticas por la crítica literaria latinoamericana: la crónica y el testimonio. Nuestra indagación focaliza en llamado "boom de la crónica" de los años noventa y dos mil en el Cono Sur latinoamericano, a partir de la puesta en marcha de una lectura metacrítica que establece un cruce necesario entre las trasformaciones que tuvieron lugar en el campo de la crítica y la teoría latinoamericana durante los años noventa (haciendo un hincapié en el impacto particular de los Estudios de Género y los Estudios Poscoloniales), y la emergencia de una nueva crónica urbana/gay como discurso habilitado para dar cauce a una serie de problemáticas de índole estética, literaria y política

Bacteriohopanepolyol data of sediment cores GeoB3918-2 and GeoB1514-6 from the Amazon River

We have investigated the delivery of terrestrial organic carbon (OC) to the Amazon shelf and deep sea fan based on soil marker bacteriohopanepolyols (BHPs; adenosylhopane and related compounds) and branched glycerol dialkyl glycerol tetraethers (GDGTs), as well as on 14C dating of bulk organic matter. The microbial biomarker records show persistent burial of terrestrial OC, evidenced by almost constant and high BIT values (0.6) and soil marker BHP concentration [80-230 µg/g TOC (total OC)] on the late Holocene shelf and even higher BIT values (0.8-0.9), but lower and more variable soil-marker BHP concentration (40-100 µg/g TOC), on the past glacial deep sea fan. Radiocarbon data show that OC on the shelf is 3-4 kyr older than corresponding bivalve shells, emphasizing the presence of old carbon in this setting. We observe comparable and unexpectedly invariant BHP composition in both marine sediment records, with a remarkably high relative abundance of C-35 amino BHPs including compounds specific for aerobic methane oxidation on the shelf (avg. 50% of all BHPs) and the fan (avg. 40%). Notably, these marine BHP signatures are strikingly similar to those of a methane-producing floodplain area in one of the Amazonian wetland (várzea) regions. The observation indicates that BHPs in the marine sediments may have initially been produced within wetland regions of the Amazon basin and may therefore document persistent export from terrestrial wetland regions, with subsequent re-working in the marine environment, both during recent and past glacial climate conditions.