(Table 1) Planktonic foraminifer abundance and stable isotope ratios of a sediment core near Baddeckenstedt, north Germany

A refined sample processing technique using glacial acetic acid has been applied to Upper Cenomanian and Lower Turonian limestones from Baddeckenstedt (Lower Saxony) enabeling the first quantitative analysis of planktonic foraminiferal populations through the Stage boundary succession in northwestern Germany. Measurements of carbonate contents, organic carbon and stable carbon and oxygen isotopes were also reported. These data allow a correlation to be made of the Baddeckenstedt section with those at Misburg (basinal facies, northwestern Germany) and Dover (Plenus Marls, southern England). Significant maxima of the organic carbon content at Baddeckenstedt correspond to prominent black shale couplets at Misburg. The planktonic foraminiferal generic groups show at Baddeckenstedt similar fluctuations as reported from Dover. Their correlation reveals details of a complex paleoceanographic regime in the NW-German Basin during the Cenomanian/Turonian Oceanic Anoxic Event.

Abordaje interdisciplinario a Viaje por los estados del Plata de Hermann Burmeister : parte II : abordaje desde la historia

El presente artículo forma parte del proyecto interdisciplinario sobre iterología mendocina que tiene como principal objetivo analizar los relatos de viajeros extranjeros a Mendoza desde una perspectiva histórica, literaria y geográfica. Desde hace tiempo, estos relatos constituyen una fuente indispensable para el estudio de nuestro pasado y el texto de Hermann Burmeister reviste especial importancia para los historiadores debido a que el científico alemán permaneció en la provincia por algo más de un año. Por esta razón sus descripciones son detalladas y minuciosas; además, estuvo en Mendoza antes de que el terremoto de 1861 la destruyera, con lo cual, su relato ayuda a recrear aquella ciudad desaparecida, El objetivo de este trabajo es ejemplificar la metodología de trabajo utilizada por la Historia para analizar el texto de viaje. Para ello, se ha escogido el tema de la presencia de las mujeres en el relato del viajero alemán.

Temperature and salinity reconstruction for sediment core GeoB3313-1

We reconstructed changes of temperature, salinity, and productivity within the southern Peru-Chile Current during the last 8000 years from a high-resolution sediment core recovered at 41°S using alkenones, isotope ratios of planktic foraminifera, biogenic opal, and organic carbon. Paleotemperatures and paleosalinities reached maximum values at ~5500 years ago and thereafter declined to modern values, whereas paleoproductivity continuously increased throughout the last 8000 years. We ascribe these long-term Holocene trends primarily to latitudinal shifts of the Antarctic Circumpolar Current (ACC). The concurrence with shifts in the position of the Southern Westerlies points to a common response of atmospheric and oceanographic circulation patterns off southern Chile. Millennial- to centennial-scale fluctuations of paleotemperatures and paleosalinities, on the other hand, lag displacements in the position of the Southern Westerlies but reveal a significant correlation to short-term temperature changes in Antarctica, indicating a high-latitude control of the ACC at these timescales.

La literatura como medio para desarrollar las habilidades sociales en jóvenes sordos

El presente trabajo es producto de la tesis doctoral titulada La generación de mundos de ficción en jóvenes sordos. La literatura como herramienta para el desarrollo del pensamiento creativo y del Proyecto de investigación: Estrategias pedagógico-didácticas para el desarrollo y aprendizaje de las habilidades sociales en escuelas públicas de enseñanza común y especial del gran Mendoza, dirigido por el Dr. Benito Parés.2 En dicho trabajo se pone en evidencia cómo a través de espacios de literatura se desarrollan las habilidades sociales de autoafirmación, entre otras, tal como la autoestima y la confianza en uno mismo a partir de la utilización de técnicas de creatividad literaria. En esta investigación nos interesó indagar respecto de las posibilidades de los jóvenes sordos para generar textos de ficción que permitieran desarrollar el pensamiento divergente, y pudimos advertir también, las habilidades sociales que se ponen en juego ante las tareas solicitadas a dichos jóvenes. A partir de las propuestas de trabajo realizadas por las Personas Sordas que participaron del proyecto, observamos por un lado el cambio de actitud frente a la tarea y por otro las manifestaciones de placer al realizar las actividades propuestas. En relación con los resultados, pudimos apreciar la presencia de habilidades sociales de autoafirmación, resolución de problemas, comunicacionales, de expresión de emociones y sentimientos entre otras, como consecuencia del trabajo con textos literarios.

Revised age models and foraminiferal records obtained for the Last Interglacial period in six marine sediment cores

The dataset contains the revised age models and foraminiferal records obtained for the Last Interglacial period in six marine sediment cores: - the Southern Ocean core MD02-2488 (age model, sea surface temperatures, benthic d18O and d13C for the period 136-108 ka), - the North Atlantic core MD95-2042 (age model, planktic d18O, benthic d18O and d13C for the period 135-110 ka), - the North Atlantic core ODP 980 (age model, planktic d18O, sea surface temperatures, seawater d18O, benthic d18O and d13C, ice-rafted detritus for the period 135-110 ka), - the North Atlantic core CH69-K09 (age model, planktic d18O, sea surface temperatures, seawater d18O, benthic d18O and d13C, ice-rafted detritus for the period 135-110 ka), - the Norwegian Sea core MD95-2010 (age model, percentage of Neogloboquadrina pachyderma sinistral, sea surface temperatures, benthic d18O, ice-rafted detritus for the period 134-110 ka), - the Labrador Sea core EW9302-JPC2 (age model, percentage of Neogloboquadrina pachyderma sinistral, sea surface temperatures, benthic d18O for the period 134-110 ka).

Corg, CaCO3, bulk densities, accumulation rates and ages of ODP Leg 167 sites and three piston cores, California margin

Sediments from five Leg 167 drill sites and three piston cores were analyzed for Corg and CaCO3. Oxygen isotope stratigraphy on benthic foraminifers was used to assign age models to these sedimentary records. We find that the northern and central California margin is characterized by k.y.-scale events that can be found in both the CaCO3 and Corg time series. We show that the CaCO3 events are caused by changes in CaCO3 production by plankton, not by dissolution. We also show that these CaCO3 events occur in marine isotope Stages (MIS) 2, 3, and 4 during Dansgaard/Oeschger interstadials. They occur most strongly, however, on the MIS 5/4 glaciation and MIS 2/1 deglaciation. We believe that the link between the northeastern Pacific Ocean and North Atlantic is primarily transmitted by the atmosphere, not the ocean. Highest CaCO3 production and burial occurs when the surface ocean is somewhat cooler than the modern ocean, and the surface mixed layer is somewhat more stable.

Calcareous nannofossil bioevents of early-middle Pleistocene sediments from the Mediterranean Sea and the Noth Atlantic

Quantitative distributions of calcareous nannofossils are analysed in the early-middle Pleistocene at the small Gephyrocapsa and Pseudoemiliania lacunosa zone transition in deep-sea cores from the Mediterranean Sea and North Atlantic Ocean (Ocean Drilling Program [ODP] Sites 977, 964 and 967, Deep Sea Drilling Project [DSDP] Site 607). The temporal and spatial mode of occurrence of medium-sized gephyrocapsids and reticulofenestrids has been examined to refine biostratigraphic constraints and evaluate possible relationships of stratigraphic patterns to environmental changes during a period of global climatic deterioration. The timing of bioevents has been calibrated using high-resolution sampling and correlation to the delta18O record in chronologically well-constrained sections. Newly identified events and ecostratigraphical signals enhance the stratigraphic resolution at the early-middle Pleistocene. The first occurrence (FO) of intermediate morphotypes between Pseudoemiliania and Reticulofenestra (Reticulofenestra sp.) is proposed as a reliable event within marine isotope stage (MIS) 35 or at the MIS 35/34 transition. The distribution of Reticulofenestra asanoi is characterized by rare and scattered occurrences in its lowest range, but the first common occurrence (FCO) is consistently identified at MIS 32 or 32/31; the last common occurrence (LCO) of the species is a distinctive event at MIS 23. In the studied interval, Gephyrocapsa omega dominates among medium-sized Gephyrocapsa. The FO of G. omega and contemporaneous re-entry of medium-sized gephyrocapsids at the lower-middle Pleistocene transition are diachronous between the Atlantic Ocean and Mediterranean Sea and from the western to eastern Mediterranean. In the Mediterranean, the LO of G. omega falls at MIS 15, insolation cycle 54 and is isochronous among the sites. Abundance fluctuations of G. omega show notable relations to early-middle Pleistocene climate changes; they considerably increase in abundance at the interglacial stages, suggesting warm water preferences. Gephyrocapsa omega temporarily disappears during the glacial MIS 22 and MIS 20. Above MIS 20, an impoverishment in G. omega and in the total abundance of medium-sized gephyrocapsids occurs. A decrease in abundance of G. omega is observed between the western Site 977 and the easternmost Site 967 in the Mediterranean Sea, as a possible response to high salinity and/or low nutrient content. Possible environmental influences on the distribution of R. asanoi and of Reticulofenestra sp. are discussed.

A time-slice study in Heinrich Stadial 1 and Mid Holocene sediment cores off northern Senegal

Sediment dynamics in limnic, fluvial and marine environments can be assessed by granulometric and rock-magnetic methodologies. While classical grain-size analysis by sieving or settling mainly bears information on composition and transport, the magnetic mineral assemblages reflect to a larger extent the petrology and weathering conditions in the sediment source areas. Here, we combine both methods to investigate Late Quaternary marine sediments from five cores along a transect across the continental slope off Senegal. This region near the modern summer Intertropical Convergence Zone is particularly sensitive to climate change and receives sediments from several aeolian, fluvial and marine sources. From each of the investigated five GeoB sediment cores (494-2956 m water depth) two time slices were processed which represent contrasting climatic conditions: the arid Heinrich Stadial 1 (~ 15 kyr BP) and the humid Mid Holocene (~ 6 kyr BP). Each sediment sample was split into 16 grain-size fractions ranging from 1.6 to 500 µm. Concentration and grain-size indicative magnetic parameters (susceptibility, SIRM, HIRM, ARM and ARM/IRM) were determined at room temperature for each of these fractions. The joint consideration of whole sediment and magnetic mineral grain-size distributions allows to address several important issues: (i) distinction of two aeolian sediment fractions, one carried by the north-easterly trade winds (40-63 µm) and the other by the overlying easterly Harmattan wind (10-20 µm) as well as a fluvial fraction assigned to the Senegal River (< 10 µm); (ii) identification of three terrigenous sediment source areas: southern Sahara and Sahel dust (low fine-grained magnetite amounts and a comparatively high haematite content), dust from Senegalese coastal dunes (intermediate fine-grained magnetite and haematite contents) and soils from the upper reaches of the Senegal River (high fine-grained magnetite content); (iii) detection of partial diagenetic dissolution of fine magnetite particles as a function of organic input and shore distance; (iv) analysis of magnetic properties of marine carbonates dominating the grain-size fractions 63-500 µm.

Juego y tradición folklórica en una novela de Mario Vargas Llosa

La relación entre la tradición oral y la literatura escrita existe desde antiguo. En este caso, las cancioncillas, las retahílas que acompañan a este tradicional, y universal, juego infantil de Las cuatro esquinas sirven al novelista Mario Vargas Llosa como núcleo generador del relato El paraíso en la otra esquina a la vez que como epítome de la andadura vital de Paul Gauguin. Esta relación entre la vida y la canción nos permite profundizar en la historia del juego de Las cuatro esquinas desde sus orígenes hasta el siglo xxi

Ecos ovidianos en una adaptación de Eurípides : Hécuba Triste de Pérez de Oliva

Hécuba triste de Pérez de Oliva, considerada una de las primeras traducciones a lengua vernácula de una tragedia griega, es una adaptación peculiar de la Hécuba de Eurípides que incorpora notables cambios, algunos de ellos por influencia de otras tragedias griegas. En este trabajo estudiamos varios motivos utilizados por Oliva que remiten a otros textos, entre los que destacan obras relacionadas directa o indirectamente con Ovidio.

In memoriam : Alan Deyermond y la oralidad en la literatura medieval hispánica

La figura de Alan Deyermond fue esencial para desarrollar los congresos de Lyra Minima. La oralidad, la autoría femenina y la interacción entre lírica culta y popular han sido temas caros a su obra. Uno de sus conceptos más acertado es la de textos transicionales referidos a los que fueron producidos durante el periodo final de la Edad Media y comienzos del Renacimiento. La relación oralidad - cultura-escrita durante esa época aparece como una transformación, como una superación y como una simbiosis. A Deyermond le resulta probable que la tradición poética popular y oral comenzara canciones de mujer llena de símbolos naturales e imágenes elementales

De la construcción de la memoria a la identidad como mutación : Apuntes sobre España de Manuel Vilas

Este trabajo analiza los procedimientos narrativos de España de Manuel Vilas en torno de la construcción de la identidad nacional. Esta se constituye como un núcleo 'pre-significativo' al que los textos buscan referirse a través de una serie de operaciones alegóricas. Ellas suponen una interrogación tanto sobre el estatuto del texto como sobre la configuración actual del sistema literario. A partir de esto, se plantea el problema del lugar de la literatura en la cultura contemporánea, cruzada por las recientes transformaciones tecnológicas digitales. Una toma de distancia respecto de las líneas que marcaron la literatura de la Transición española, primero, y la ligada con la recuperación de 'memoria histórica', después, abre España a una concepción de la invención literaria como mutación ficcional

De la construcción de la memoria a la identidad como mutación : Apuntes sobre España de Manuel Vilas

Este trabajo analiza los procedimientos narrativos de España de Manuel Vilas en torno de la construcción de la identidad nacional. Esta se constituye como un núcleo 'pre-significativo' al que los textos buscan referirse a través de una serie de operaciones alegóricas. Ellas suponen una interrogación tanto sobre el estatuto del texto como sobre la configuración actual del sistema literario. A partir de esto, se plantea el problema del lugar de la literatura en la cultura contemporánea, cruzada por las recientes transformaciones tecnológicas digitales. Una toma de distancia respecto de las líneas que marcaron la literatura de la Transición española, primero, y la ligada con la recuperación de 'memoria histórica', después, abre España a una concepción de la invención literaria como mutación ficcional

Clay mineraology and grain size composition of surface sediments from South Pacific Ocean

The reconstruction of low-latitude ocean-atmosphere interactions is one of the major issues of (paleo-)environmental studies. The trade winds, extending over 20° to 30° of latitude in both hemispheres, between the subtropical highs and the intertropical convergence zone, are major components of the atmospheric circulation and little is known about their long-term variability on geological time-scales, in particular in the Pacific sector. We present the modern spatial pattern of eolian-derived marine sediments in the eastern equatorial and subtropical Pacific (10°N to 25°S) as a reference data set for the interpretation of SE Pacific paleo-dust records. The terrigenous silt and clay fractions of 75 surface sediment samples have been investigated for their grain-size distribution and clay-mineral compositions, respectively, to identify their provenances and transport agents. Dust delivered to the southeast Pacific from the semi- to hyper-arid areas of Peru and Chile is rather fine-grained (4-8 µm) due to low-level transport within the southeast trade winds. Nevertheless, wind is the dominant transport agent and eolian material is the dominant terrigenous component west of the Peru-Chile Trench south of ~ 5°S. Grain-size distributions alone are insufficient to identify the eolian signal in marine sediments due to authigenic particle formation on the sub-oceanic ridges and abundant volcanic glass around the Galapagos Islands. Together with the clay-mineral compositions of the clay fraction, we have identified the dust lobe extending from the coasts of Peru and Chile onto Galapagos Rise as well as across the equator into the doldrums. Illite is a very useful parameter to identify source areas of dust in this smectite-dominated study area.

Bulk calcite minor element composition of ODP Leg 130 samples

We investigated minor element ratios (Sr/Ca and Mg/Ca) in bulk sediment samples from Sites 803-807 using a recently optimized sample treatment protocol for calcium-carbonate-rich sediments consisting of sequential reductive and ion exchange treatments. We evaluated this protocol relative to bulk sediment leaching using samples from Sites 804 and 806, the two end-member sites in the depth transect, reporting as well Mn/Ca and Fe/Ca ratios for sediments from these two sites processed by means of both methods. The Sr/Ca ratios were only slightly affected by the sample treatment, with an average reduction of 6%-7% caused primarily by the ion exchange step. The reductive sample treatment, designed to be effective at removing Mn-rich oxyhydroxides, has a major effect on Mg/Ca ratios, with up to 50% reduction, whereas little effect occurred in ion exchange alone on Mg/Ca ratios. The Mn/Ca and Fe/Ca ratios were not consistently offset by the sample treatment, and these ratios do not appear to be representative of calcite geochemistry reflecting either ocean history or diagenetic overprinting. Celestite solubility appears to be an important control on interstitial water Sr concentrations in these sites, and it must be considered when constructing Sr mass balance models of calcite recrystallization. Calcite Sr/Ca ratios (range 1-2 mmol/mol) are similar from site to site when plotted vs. age, with a pattern comparable to that for well-preserved foraminifer tests over the past 40 Ma. Interstitial water Mg and Ca gradients appear to reflect basement character and the intensity of alteration; they can vary substantially over a small area. Calcite Mg/Ca ratios (range 1.5-4.5 mmol/mol) differ from site to site, with generally higher ratios for sites at a shallower water depth. Increasing calcite Mg/Ca ratios correlate with decreasing Sr/Ca ratios in the treated samples. No consistent pattern exists for calcite Mg/Ca ratios vs. age or depth, nor is any direct correlation to interstitial water Mg/Ca ratios present.