Distribution of ostracoda in the lower Cretaceous succession of ODP Hole 80-549 (Figure 3)

Site 549 recovered a Lower Cretaceous succession which has been shown to include parts of the Barremian and Albian stages. Forty-four species of Ostracoda are illustrated and their stratigraphic distribution used to recognise three major facies units. An high diversity inner shelf facies earlier in the Barremian gives way to a low diversity, outer shelf facies, higher in the succession. The early Albian appears to indicate a return to an inner shelf fauna. The faunas recovered have been compared to similar faunas elsewhere in N. W. Europe.

Lithofacies, chronostratigraphy, minerals and diagenetic silica facies at DSDP Leg 80 Holes

X-ray powder diffraction and optical and scanning-electron microscope analyses of sediment samples taken from four sites drilled in the Goban Spur area of the northeast Atlantic show variable diagenetic silicification of sediments at several stratigraphic horizons. The results are as follows: 1. The silicified sediments are middle Eocene at Site 548, Paleocene to lower Albian at Site 549, upper to lower Paleocene at Site 550, and lower Turanian at Site 551. 2. There are three types of these silicified sediments: nodular type in carbonate-rich host sediments, bedded type in clayey host sediments, and a type transitional between the other two. 3. Silica diagenesis is considered to progress as follows: dissolution of siliceous fossils; precipitation of opal CT in pore spaces and transformation of biogenic silica (opal A) to opal CT, development of opal CT cement; chalcedonic quartz precipitation in pore spaces and replacement of foraminiferal tests by chalcedonic quartz; and finally, transformation of opal CT to quartz, and cementation. But the strong influence of host-sediment types on diagenetic silica fades is recognized. Bedded-type silicified sediments in a clayey environment indicate a lower grade of silica diagenesis. Only very weak chalcedonic quartz formation is recognized, and there is no opal CT cementation, even in Lower Cretaceous bedded-type clayey silicified sediments. 4. The rf(101) spacing of opal CT shows two distinct trends of ordering or decrease with burial depth; one is a rapid change, in the case of nodular silicified sediments, and the other is a more gentle shift, found in bedded silicified sediments. 5. Diagenetic silica facies of the nodular type develop as irregular concentric zones around some nodule nuclei. Also, quartz-chert nodule formation occurs at rather shallower horizons, and is discordant with the trend of decreasing d(101) spacing in opal CT. 6. Silicified sediments at Site 551 are shallower than at the other sites. The diagenetic silica facies suggest the probable erosion of 300 m or more of sediment at this site. 7. The zeolites clinoptilolite and phillipsite were found in the sediment samples recovered on Leg 80. Clinoptilolite occurs from the shallower levels to the deepest horizons of diagenetically silicified zones, suggesting that clinoptilolite formation is related to diagenesis of biogenic silica. Phillipsite at Site 551 (Section 551-5-2) may originate from volcanogenie material.

Imágenes de locura y psiquiatría en el cine argentino de los años '70 y '80

El siguiente articulo trata las formas de representación de la psiquiatría y locura en cinco películas argentinas, rodadas entre 1972 y 1993. Estos veinte anos estan caracterizados por las dos dictaduras bajo Onganía y Videla y la nueva democracia a partir de 1983. Al mismo tiempo este periodo esta marcado por el debate del movimiento anti-psiquiátrico, que exigió la abertura de los centros de psiquiátricos y un cambio en el tratamiento de la "Otredad". Partiendo de los estudios de Michel Foucault sobre el lugar heterotopico, la psiquiatría, y las estructuras de poder, iluminamos/analizamos la construcción de imágenes del hospital neuropsiquiátrico, del cuerpo medico y la función del loco en el filme argentino. El articulo demuestra, en que medida las imágenes de la psiquiatría ofician como espejo de la sociedad y la realidad política. También se va a comparar las investigaciones sobre técnicas de representación de la psiquiatría en el cine mundial (especialmente el norteamericano y el europeo) con el cine argentino, para posicionarlo y realzar consensos/analogias y diferencias. Acá el articulo se concentrara especialmente en la función política de la película psiquiátrica. La supuesta despolitización del filme psiquiátrico en el cine mundial no se puede verificar para las películas argentinas. Mas bien siguen funcionando también en los anos ?80 como medio de echar una mirada exterior a irregularidades políticas y injusticias sociales. A través de las figuras, que gozan de libertad de expresión, se abren discursos que operan con la ambigüedad bajo el pretexto de la locura. Ese parece ser, sobre todo durante los periodos políticamente precarios, un modo de atacar a través de metáforas las practicas de poder