Del Mp3 al Fan Shot Multicam, génesis de nuevos lenguajes multimedia

Esta ponencia analiza la usabilidad, mutación y dominio de una interfaz multimedia determinada con un enfoque tecnológico sociocultural, económico y productivo; partiendo de la utilización, masificación, mercantilización y difusión de contenidos electrónicos que culminan en procesos de domesticación de los mismos para su posterior remediación. La construcción de lenguajes en tanto actividades concretas dentro de interfases de uso común, están presentes en el marco de practicas culturales que sectores de la población mantienen al seno de sus vidas cotidianas. Así, el usuario apropia, consume y reinterpreta lenguajes impuestos mediante la creación de otros nuevos, que destaquen/condicionen la utilización de dispositivos e interfases dadas. Reflexionando entonces, sobre el affordance entre el usuario y la máquina en tanto intercambio comunicativo; esta ponencia toma como ejemplo el registro 'amateur' de la gira Lights In The Sky de la agrupación Nine Inch Nails en 2007 entendiendo que, a partir de la estandarización de formatos de transmisión de datos, particularmente de tecnologías aplicadas a la difusión e intercambio de contenidos musicales, nos ubicamos al frente de un nuevo punto de partida, condicionado y potenciado por un ciclo de experiencias y desarrollo lingüístico que ha corrido de la mano del ciclo tecnológico de la ultima década

Isotopic composition of terrestrial plant waxes (dD and d13C of n-alkanes) of sediment core SO188_342 from the Northern Bay of Bengal for the last 18 ka

The Indian Summer Monsoon (ISM) is a major global climatic phenomenon. Long-term precipitation proxy records of the ISM, however, are often fragmented and discontinuous, impeding an estimation of the magnitude of precipitation variability from the Last Glacial to the present. To improve our understanding of past ISM variability, we provide a continuous reconstructed record of precipitation and continental vegetation changes from the lower Ganges-Brahmaputra-Meghna catchment and the Indo-Burman ranges over the last 18,000 years (18 ka). The records derive from a marine sediment core from the northern Bay of Bengal (NBoB), and are complemented by numerical model results of spatial moisture transport and precipitation distribution over the Bengal region. The isotopic composition of terrestrial plant waxes (dD and d13C of n-alkanes) are compared to results from an isotope-enabled general atmospheric circulation model (IsoCAM) for selected time slices (pre-industrial, mid-Holocene and Heinrich Stadial 1). Comparison of proxy and model results indicate that past changes in the dD of precipitation and plant waxes were mainly driven by the amount effect, and strongly influenced by ISM rainfall. Maximum precipitation is detected for the Early Holocene Climatic Optimum (EHCO; 10.5-6 ka BP), whereas minimum precipitation occurred during the Heinrich Stadial 1 (HS1; 16.9-15.4 ka BP). The IsoCAM model results support the hypothesis of a constant moisture source (i.e. the NBoB) throughout the study period. Relative to the pre-industrial period the model reconstructions show 20% more rain during the mid-Holocene (6 ka BP) and 20% less rain during the Heinrich Stadial 1 (HS1), respectively. A shift from C4-plant dominated ecosystems during the glacial to subsequent C3/C4-mixed ones during the interglacial took place. Vegetation changes were predominantly driven by precipitation variability, as evidenced by the significant correlation between the dD and d13C alkane records. When compared to other records across the ISM domain, precipitation and vegetation changes inferred from our records and the numerical model results provide evidence for a coherent regional variability of the ISM from the Last Glacial to the present.

Del Mp3 al Fan Shot Multicam, génesis de nuevos lenguajes multimedia

Esta ponencia analiza la usabilidad, mutación y dominio de una interfaz multimedia determinada con un enfoque tecnológico sociocultural, económico y productivo; partiendo de la utilización, masificación, mercantilización y difusión de contenidos electrónicos que culminan en procesos de domesticación de los mismos para su posterior remediación. La construcción de lenguajes en tanto actividades concretas dentro de interfases de uso común, están presentes en el marco de practicas culturales que sectores de la población mantienen al seno de sus vidas cotidianas. Así, el usuario apropia, consume y reinterpreta lenguajes impuestos mediante la creación de otros nuevos, que destaquen/condicionen la utilización de dispositivos e interfases dadas. Reflexionando entonces, sobre el affordance entre el usuario y la máquina en tanto intercambio comunicativo; esta ponencia toma como ejemplo el registro 'amateur' de la gira Lights In The Sky de la agrupación Nine Inch Nails en 2007 entendiendo que, a partir de la estandarización de formatos de transmisión de datos, particularmente de tecnologías aplicadas a la difusión e intercambio de contenidos musicales, nos ubicamos al frente de un nuevo punto de partida, condicionado y potenciado por un ciclo de experiencias y desarrollo lingüístico que ha corrido de la mano del ciclo tecnológico de la ultima década

Del Mp3 al Fan Shot Multicam, génesis de nuevos lenguajes multimedia

Esta ponencia analiza la usabilidad, mutación y dominio de una interfaz multimedia determinada con un enfoque tecnológico sociocultural, económico y productivo; partiendo de la utilización, masificación, mercantilización y difusión de contenidos electrónicos que culminan en procesos de domesticación de los mismos para su posterior remediación. La construcción de lenguajes en tanto actividades concretas dentro de interfases de uso común, están presentes en el marco de practicas culturales que sectores de la población mantienen al seno de sus vidas cotidianas. Así, el usuario apropia, consume y reinterpreta lenguajes impuestos mediante la creación de otros nuevos, que destaquen/condicionen la utilización de dispositivos e interfases dadas. Reflexionando entonces, sobre el affordance entre el usuario y la máquina en tanto intercambio comunicativo; esta ponencia toma como ejemplo el registro 'amateur' de la gira Lights In The Sky de la agrupación Nine Inch Nails en 2007 entendiendo que, a partir de la estandarización de formatos de transmisión de datos, particularmente de tecnologías aplicadas a la difusión e intercambio de contenidos musicales, nos ubicamos al frente de un nuevo punto de partida, condicionado y potenciado por un ciclo de experiencias y desarrollo lingüístico que ha corrido de la mano del ciclo tecnológico de la ultima década

Rare earth elements of modern seeps from the Gulf of Mexico, the Black Sea, and the Congo Fan

At marine seeps, methane is microbially oxidized resulting in the precipitation of carbonates close to the seafloor. Methane oxidation leads to sulfate depletion in sediment pore water, which induces a change in redox conditions. Rare earth element (REE) patterns of authigenic carbonate phases collected from modern seeps of the Gulf of Mexico, the Black Sea, and the Congo Fan were analyzed. Different carbonate minerals including aragonite and calcite with different crystal habits have been selected for analysis. Total REE content (SumREE) of seep carbonates varies widely, from 0.1 ppm to 42.5 ppm, but a common trend is that the SumREE in microcrystalline phases is higher than that of the associated later phases including micospar, sparite and blocky cement, suggesting that SumREE may be a function of diagenesis. The shale-normalized REE patterns of the seep carbonates often show different Ce anomalies even in samples from a specific site, suggesting that the formation conditions of seep carbonates are variable and complex. Overall, our results show that apart from anoxic, oxic conditions are at least temporarily common in seep environments.

Grain size distribution of Oligocene and Miocene sediments from the Indus Fan

The Owen Ridge south of Oman represents oceanic crust that was uplifted by compressional tectonic forces in the early Miocene. Build-out of the Indus Fan led to deposition of a thick sequence of turbidites over the site of the Ridge during the late Oligocene and early Miocene. Early Miocene uplift of the Ridge led to a pelagic cap of nannofossil chalks. Two short sequences of turbidites from the pre- and syn-uplift phases were chosen for detailed grain size analysis. The upper Oligocene section at Site 731 is composed of thin (centimeter-decimeter scale) graded mud turbidites separated by relatively thick (decimeter-meter scale) intervals of homogeneous, non-bioturbated clayey siltstones. These finer intervals are unusually silt-rich (about 60%) for ungraded material and were probably deposited as undifferentiated muds from a series of turbidity current tails. By contrast, the lower Miocene section at Site 722 is comprised of a sequence of interbedded turbidites and hemipelagic carbonates. Sharp-based silt turbidites are overlain by burrow-mottled marly nannofossil chalks. The Oligocene sequence may have accumulated in an overbank setting on the middle fan - the local topographic position favoring frequent deposition from turbidity current tails and occasional deposition from the body of a turbidity flow. Uplift of the Ridge in the early Miocene led to pelagic carbonate deposition interrupted only by turbidity currents capable of overcoming a topographic barrier. Further uplift eventually led to entirely pelagic carbonate deposition.

CaCO3 content, terrigenous components, foraminifera abundance and age of sediment core MD95-2006, Barra Fan, UK

Lithology, lithic petrology, planktonic foraminiferal abundances, and clastic grain sizes have been determined in a 30 m-long core recovered from the Barra Fan off northwest Scotland. The record extends back to around 45 kyr B.P., with sedimentation rates ranging between 50 and 200 cm/kyr. The abundance of ice-rafted debris indicates 16 glacimarine events, including temporal equivalents to Heinrich events 1-4. Enhanced concentrations of basaltic material derived from the British Tertiary Province suggest that the glacimarine sediments record variations in a glacial source on the Hebrides shelf margin. Glacimarine zones are separated by silty intervals with high planktonic foraminifera concentrations that reflect an interstadial circulation regime in the Rockall Trough. The results suggest that the last British Ice Sheet fluctuated with a periodicity of 2000-3000 years, in common with the Dansgaard-Oeschger climate cycle.

Gas emissions and ROV survey tracks of the Regab pockmark (Northern Congo Fan)

Pockmarks are seafloor depressions commonly associated with fluid escape from the seabed and are believed to contribute noticeably to the transfer of methane into the ocean and ultimately into the atmosphere. They occur in many different areas and geological contexts, and vary greatly in size and shape. Nevertheless, the mechanisms of pockmark growth are still largely unclear. Still, seabed methane emissions contribute to the global carbon budget, and understanding such processes is critical to constrain future quantifications of seabed methane release at local and global scales. The giant Regab pockmark (9°42.6' E, 5°47.8' S), located at 3160 m water depth near the Congo deep-sea channel (offshore southwestern Africa), was investigated with state-of-the-art mapping devices mounted on IFREMER's (French Research Institute for Exploitation of the Sea) remotely operated vehicle (ROV) Victor 6000. ROV-borne micro-bathymetry and backscatter data of the entire structure, a high-resolution photo-mosaic covering 105,000 m2 of the most active area, sidescan mapping of gas emissions, and maps of faunal distribution as well as of carbonate crust occurrence are combined to provide an unprecedented detailed view of a giant pockmark. All data sets suggest that the pockmark is composed of two very distinctive zones in terms of seepage intensity. We postulate that these zones are the surface expression of two fluid flow regimes in the subsurface: focused flow through a fractured medium and diffuse flow through a porous medium. We conclude that the growth of giant pockmarks is controlled by self-sealing processes and lateral spreading of rising fluids. In particular, partial redirection of fluids through fractures in the sediments can drive the pockmark growth in preferential directions.

Ikaite of sediment cores from the Zaire deep-sea fan

Most concentration profiles of sulfate in continental margin sediments show constant or continuously increasing gradients from the benthic boundary layer down to the deep sulfate reduction zone. However, a very marked change in this gradient has been observed several meters below the surface at many locations, which has been attributed to anoxic sulfide oxidation or to non-local transport mechanisms of pore waters. The subject of this study is to investigate whether this feature could be better explained by non-steady state conditions in the pore-water system. To this end, data are presented from two gravity cores recovered from the Zaire deep-sea fan. The sediments at this location can be subdivided into two sections. The upper layer, about 10 m thick, consists of stratified pelagic deposits representing a period of continuous sedimentation over the last 190 kyr. It is underlain by a turbidite sequence measuring several meters in thickness, which contains large crystals of authigenic calcium carbonate (ikaite: CaCO3·6H2O). Ikaite delta13C values are indicative of a methane carbon contribution to the CO2 pool. Radiocarbon ages of these minerals, as well as of the adjacent bulk sediments, provide strong evidence that the pelagic sediments have overthrust the lower section as a coherent block. Therefore, the emplacement of a relatively undisturbed sediment package is postulated. Pore-water profiles show the depth of the sulfate-methane transition zone within the turbiditic sediments. By the adaptation of a simple transport-reaction model, it is shown that the change in the geochemical environmental conditions, resulting from this slide emplacement, and the development towards a new steady state are fully sufficient to explain all features related to the pore-water profiles, particularly, [SO4]2- and dissolved inorganic carbon (DIC). The model shows that the downslope transport took place about 300 yr ago.