Summary of physical properties on cores used for petrofabric analyses triaxial experiments at DSDP Leg 67 Holes

Deformation features within the cores are studied with a view towards elucidating the structure of the Middle America Trench along the transect drilled during Leg 67. Where possible, inferences are made as to the physical environment of deformation. Extensional tectonics prevails in the area of the seaward slope and trench. Fracturing and one well-preserved normal fault are found mostly within the lower Miocene chalks, at the base of the sedimentary section. These chalks have high porosities (40%-60%) and water content (30%-190%, based on % dry wt.). Experimental triaxial compression tests conducted on both dry and water-saturated samples of chalk from Holes 495 and 499B show that only in the saturated samples is more brittle behavior observed. Brittle failure of the chalks is greatly facilitated by pore fluid pressures that lead to low effective pressures. Additional embrittlement (weakening) can take place as a result of the imposed extensional stress resulting from bending of a subducting elastic oceanic plate. The chalks exhibit, in a landward direction, an increase in density and mechanical strength and a decrease in water content. These changes are attributed to mechanical compaction that may have resulted from tectonic horizontal compression. The structure of the landward slope is not well understood because the slope sites had to be abandoned due to the presence of gas hydrate. The relationship of the chaotic, brittle deformation (observed in the cores from Hole 494A) at the base of the landward slope to tectonic processes remains unclear. The deformation observed on the slope sites (Holes 496 and 497) is mostly fracturing and near-vertical sigmoidal veinlets. These are interpreted as being the result of gas/fluid overpressurization due to the decomposition of the gas hydrate, and not due to tectonic loading of accreted sediments. Aside from four small displacement (less than 1cm) reverse faults observed in the lower Miocene chalks (which may be the product of soft-sediment deformation), there is a noticeable absence of structures reflecting a dominance of horizontal (tectonic) compression along the transect drilled. The absence of such features, the lack of continuity of sediment types across the trench-landward slope, and the normal stratigraphic sequence in Hole 494A do not support any known accretionary model.

(Table 2) Concentrations of dissolved Zn, Cd, Pb, and Cu in waters of the Baltic Sea

A method of determination of low concentrations of zinc, cadmium, lead, and copper dissolved in seawater and interstitial water with use of inversion voltammetry with AC solution conditions is described. The optimum conditions for measurements with accumulation on a mercury-film electrode with a silver substrate are presented. Detection limit is 0.2 ?g/l for zinc and 0.05 ?g/l for cadmium, lead, and copper. Large number of determinations can be carried out during expeditions at natural pH of seawater containing these four metals.

Pollen records from two outcrop profiles in the Kakitu Mountain of Tibet

There is a great similarity between pollen types which occur in the early Holocene NE Tibetan pollen spectra and those which are commonly considered to be typical for the Würm Late Glacial period in Central Europe and for the Würm Pleniglacial period in Southern Europe. Evidently, this similarity is due to a remarkable general conformity of plant taxa growing in cold-arid regions of the northern hemisphere. The improvement of the climate and the retreat of the glaciers that commenced at the end of the Würm period had already terminated definitely before 9500 BP. In addition, the climatic situation as well as the vegetation belts must have remained rather constant during the following 3000 yr, i.e. through most parts of the climatic optimum of the Holocene.

Intertextualidad y génesis en los textos mexicanos de Manuel Puig : Novelas, guiones, comedias musicales [1974-1978]

La tesis se inscribe en el marco teórico de la crítica genética, cuyos materiales privilegiados de estudio son los manuscritos modernos o de autor. En base a la consideración del conjunto de los manuscritos de Manuel Puig, establecí un recorte espacio-temporal en un momento y una geografía que constituyeron un punto de viraje en el proyecto creador de Puig. La tesis, con un total de 496 páginas, se presenta en dos partes. Parte I (220pp.): El desarrollo argumentativo se resume en las Conclusiones, que copio. Esta parte se completa con tres documentos, dos inéditos: Un reportaje realizado por mí a Xavier Labrada, gran amigo de Manuel Puig durante el período estudiado y hasta el fin de sus días (inédito); un reportaje de Mausi Martínez a César Calcagno, exiliado argentino amigo de Puig, "informante" privilegiado para el personaje de Pozzi en Pubis angelical (PA) y de influencia hasta hoy desconocida en el personaje de Valentín de El beso de la mujer araña (EBMA, reportaje inédito); un reportaje realizado por Elena Poniatowska a Manuel Puig, a pocos meses de su llegada a México y en medio de la escritura de El beso de la mujer araña (rescatado del Archivo Puig). Conclusiones: El estudio de los manuscritos de autor nos permitió abrir una nueva perspectiva de trabajo en relación con la obra de Manuel Puig, un autor singular atravesado por una circunstancia sociohistórica que llega a ser característica en la literatura argentina: el exilio, la censura. Son las huellas de su circunstancia lo primero que permiten ver los manuscritos: anotaciones en papelitos de un bar, papel con membrete de hoteles, polémicas de políticas culturales, guías de exposiciones, no nos dicen qué está pensando Puig, pero indican en qué condiciones lo hizo.

La ocupación de la tierra en Neuquén: política distributiva, formas de tenencia y uso del suelo (1880-1920)

En este trabajo se pretende dar a conocer una síntesis de los resultados alcanzados en los estudios sobre la cuestión de la distribución/apropiación de tierras y su vinculación con el desarrollo de la actividad ganadera en territorio neuquino, a partir de establecer la relación existente entre las normas legales -que expresan las políticas de distribución de la tierra pública por parte del estado nacional- y las prácticas concretas -que se definen a partir del accionar del gobierno en la concesión de esas tierras y de las estrategias puestas en juego por los sujetos sociales involucrados para su apropiación especulativa o su puesta en producción efectiva.