Sobre el acto de compilar. Una lectura crítica de Estatuas de sal. Cuentistas cubanas contemporáneas

Las obras de carácter antológico organizan una muestra de la producción literaria de un período determinado y constituyen una postura crítica respecto de esa producción, pues el hecho de elegir ciertas obras y descartar otras implica un ejercicio crítico y canonizador. En 1996, Mirta Yáñez y Marilyn Bobes publican Estatuas de sal. Cuentistas cubanas contemporáneas, compilación que fundamentan en la necesidad de llenar un vacío debido a la neutralización y/o silenciamiento de la narrativa escrita por mujeres en Cuba. El acto de publicar es una forma de intervención en el espacio social y esta toma de la palabra es una forma de inaugurar un lugar, un espacio y, ante todo, de crear una genealogía legitimadora. Cuando la que contribuye al ejercicio de crear una tradición es una compilación, resulta imprescindible investigar las tensiones subterráneas que sostienen sus cimientos así como analizar las distintas operaciones de rupturas y desvíos que buscan construir una genealogía paralela o por fuera de la canónica

Sobre el acto de compilar. Una lectura crítica de Estatuas de sal. Cuentistas cubanas contemporáneas

Las obras de carácter antológico organizan una muestra de la producción literaria de un período determinado y constituyen una postura crítica respecto de esa producción, pues el hecho de elegir ciertas obras y descartar otras implica un ejercicio crítico y canonizador. En 1996, Mirta Yáñez y Marilyn Bobes publican Estatuas de sal. Cuentistas cubanas contemporáneas, compilación que fundamentan en la necesidad de llenar un vacío debido a la neutralización y/o silenciamiento de la narrativa escrita por mujeres en Cuba. El acto de publicar es una forma de intervención en el espacio social y esta toma de la palabra es una forma de inaugurar un lugar, un espacio y, ante todo, de crear una genealogía legitimadora. Cuando la que contribuye al ejercicio de crear una tradición es una compilación, resulta imprescindible investigar las tensiones subterráneas que sostienen sus cimientos así como analizar las distintas operaciones de rupturas y desvíos que buscan construir una genealogía paralela o por fuera de la canónica

Sobre el acto de compilar. Una lectura crítica de Estatuas de sal. Cuentistas cubanas contemporáneas

Las obras de carácter antológico organizan una muestra de la producción literaria de un período determinado y constituyen una postura crítica respecto de esa producción, pues el hecho de elegir ciertas obras y descartar otras implica un ejercicio crítico y canonizador. En 1996, Mirta Yáñez y Marilyn Bobes publican Estatuas de sal. Cuentistas cubanas contemporáneas, compilación que fundamentan en la necesidad de llenar un vacío debido a la neutralización y/o silenciamiento de la narrativa escrita por mujeres en Cuba. El acto de publicar es una forma de intervención en el espacio social y esta toma de la palabra es una forma de inaugurar un lugar, un espacio y, ante todo, de crear una genealogía legitimadora. Cuando la que contribuye al ejercicio de crear una tradición es una compilación, resulta imprescindible investigar las tensiones subterráneas que sostienen sus cimientos así como analizar las distintas operaciones de rupturas y desvíos que buscan construir una genealogía paralela o por fuera de la canónica

Rare earth element data for sediments from ODP Leg 127

The relative effects of paleoceanographic and paleogeographic variations, sediment lithology, and diagenetic processes on the recorded rare earth element (REE) chemistry of Japan Sea sediments are evaluated by investigating REE total abundances and relative fractionations in 59 samples from Ocean Drilling Program Leg 127. REE total abundances (Sum REE) in the Japan Sea are strongly dependent upon the paleoceanographic position of a given site with respect to terrigenous and biogenic sources. REE concentrations at Site 794 (Yamato Basin) overall correspond well to aluminosilicate chemical indices and are strongly diluted by SiO2 within the late Miocene-Pliocene diatomaceous sequence. Eu/Eu* values at Site 794 reach a maximum through the diatomaceous interval as well, most likely suggesting an association of Eu/Eu* with the siliceous component, or reflecting slight incorporation of a detrital feldspar phase. Sum REE at Site 795 (Japan Basin) also is affiliated strongly with aluminosilicate phases, yet is diluted only slightly by siliceous input. At Site 797 (Yamato Basin), REE is not as clearly associated with the aluminosilicate fraction, is correlated moderately to siliceous input, and may be sporadically influenced by detrital heavy minerals originating from the nearby rifted continental fragment composing the Yamato Rise. The biogenic influence is largest at Site 794, moderately developed at Site 797, and of only minor importance at Site 795, reflecting basinal contrasts in productivity such that the Yamato Basin records greater biogenic input than the Japan Basin, while the most productive waters overlie the easternmost sequence of Site 794. Ce/Ce* profiles at all three sites increase monotonically with depth, and record progressive diagenetic LREE fractionation. The observed Ce/Ce* record does not respond to changes in oxygenation state of the overlying water, and Ce/Ce* correlates slightly better with depth than with age. The downhole increase in Ce/Ce* at Site 794 and Site 797 is a passive response to diagenetic transfer of LREE (except Ce) from sediment to interstitial water. At Site 795, the overall lack of correlation between Ce/Ce* and La_n/Yb_n suggests that other processes are occurring which mask the diagenetic behavior of all LREEs. First-order calculations of the Ce budget in Japan Sea waters and sediment indicate that ~20% of the excess Ce adsorbed by settling particles is recycled within the water column, and that an additional ~38% is recycled at or near the seafloor (data from Masuzawa and Koyama, 1989). Thus, because the remaining excess Ce is only ~10% of the total Ce, there is not a large source of Ce to the deeply buried sediment, further suggesting that the downhole increase in Ce/Ce* is a passive response to diagenetic behavior of the other LREEs. The REE chemistry of Japan Sea sediment therefore predicts successive downhole addition of LREEs to deeply-buried interstitial waters.

Strontium isotope ratios of plant and soil samples from France

The dataset consists of 87Sr/86Sr isotope ratios of plant samples and soil leachates covering the major geologic regions of France. In addition to the isotope data it provides the spatial context for each sample, including background geology, field observations and soil descriptions. The dataset can be used to create Sr isoscapes for France, which can be applied in a wide range of fields including archaeology, ecology, soil, food, and forensic sciences.

Chemical composition of DSDP and ODP cherts

Rare earth element (REE), major, and trace element abundances and relative fractionations in forty nodular cherts sampled by the Deep Sea Drilling Project (DSDP) and Ocean Drilling Program (ODP) indicate that the REE composition of chert records the interplay between terrigenous sources and scavenging from the local seawater. Major and (non-REE) trace element ratios indicate that the aluminosilicate fraction within the chert is similar to NASC (North American Shale Composite), with average Pacific chert including ~7% NASC-like particles, Indian chert ~11% NASC, Atlantic chert ~17% NASC, and southern high latitude (SHL) chert 53% NASC. Using La as a proxy for sum REE, approximations of excessive La (the amount of La in excess of that supplied by the detrital aluminosilicate fraction) indicate that Pacific chert contains the greatest excessive La (85% of total La) and SHL chert the least (38% of total La). As shown by interelement associations, this excessive La is most likely an adsorbed component onto aluminosilicate and phosphatic phases. Accordingly, chert from the large Pacific Ocean, where deposition occurs relatively removed from significant terrigenous input, records a depositional REE signal dominated by adsorption of dissolved REEs from seawater. Pacific chert Ce/Ce* <<1 and normative La/Yb ~ 0.8-1, resulting from adsorption of local Ce-depleted seawater and preferential adsorption of LREEs from seawater (e.g., normative La/Yb ~0.4), which increases the normative La/Yb ratio recorded in chert. Chert from the Atlantic basin, a moderately sized ocean basin lined by passive margins and with more terrigenous input than the Pacific, records a mix of adsorptive and terrigenous REE signals, with moderately negative Ce anomalies and normative La/Yb ratios intermediate to those of the Pacific and those of terrigenous input. Chert from the SHL region is dominated by the large terrigenous input on the Antarctic passive margin, with inherited Ce/Ce* ~1 and inherited normative La/Yb values of ~1.2-1.4. Ce/Ce* does not vary with age, either throughout the entire data base or within a particular basin. Overall, Ce/Ce* does not correlate with P2O5 concentrations, even though phosphatic phases may be an important REE carrier.

(Table 1) Climate characteristics of the four North American Tundra Experiment (ITEX) sites

Climate warming is expected to differentially affect CO2 exchange of the diverse ecosystems in the Arctic. Quantifying responses of CO2 exchange to warming in these ecosystems will require coordinated experimentation using standard temperature manipulations and measurements. Here, we used the International Tundra Experiment (ITEX) standard warming treatment to determine CO2 flux responses to growing-season warming for ecosystems spanning natural temperature and moisture ranges across the Arctic biome. We used the four North American Arctic ITEX sites (Toolik Lake, Atqasuk, and Barrow [USA] and Alexandra Fiord [Canada]) that span 10° of latitude. At each site, we investigated the CO2 responses to warming in both dry and wet or moist ecosystems. Net ecosystem CO2 exchange (NEE), ecosystem respiration (ER), and gross ecosystem photosynthesis (GEP) were assessed using chamber techniques conducted over 24-h periods sampled regularly throughout the summers of two years at all sites. At Toolik Lake, warming increased net CO2 losses in both moist and dry ecosystems. In contrast, at Atqasuk and Barrow, warming increased net CO2 uptake in wet ecosystems but increased losses from dry ecosystems. At Alexandra Fiord, warming improved net carbon uptake in the moist ecosystem in both years, but in the wet and dry ecosystems uptake increased in one year and decreased the other. Warming generally increased ER, with the largest increases in dry ecosystems. In wet ecosystems, high soil moisture limited increases in respiration relative to increases in photosynthesis. Warming generally increased GEP, with the notable exception of the Toolik Lake moist ecosystem, where warming unexpectedly decreased GEP >25%. Overall, the respiration response determined the effect of warming on ecosystem CO2 balance. Our results provide the first multiple-site comparison of arctic tundra CO2 flux responses to standard warming treatments across a large climate gradient. These results indicate that (1) dry tundra may be initially the most responsive ecosystems to climate warming by virtue of strong increases in ER, (2) moist and wet tundra responses are dampened by higher water tables and soil water contents, and (3) both GEP and ER are responsive to climate warming, but the magnitudes and directions are ecosystem-dependent.