G'day Gondwana - the final accretion of a supercontinent: U-Pb ages from the post-orogenic Sao Vicente Granite, northern Paraguay Belt, Brazil

The Paraguay Belt in central South America is part of a larger chain of orogenic belts, including the Araguaia Belt to the northeast and potentially the Pampean Belt to the south, which are believed to mark the suture zone of the Clymene Ocean - interpreted amongst the youngest of the Gondwana amalgamation orogens. The post-orogenic Sao Vicente Granite crops out in the northern Paraguay Belt and cuts the basal unit of the deformed and metamorphosed Cuiaba Group. The age of this granite therefore provides a long sort after minimum age for orogenesis within the belt. Dating crystallisation of this important intrusion is challenging due to the presence of considerable common-Pb. However, based on LA-ICPMS dating of more than 100 zircons from three separate samples we interpret a robust crystallisation age for the Sao Vicente batholith at 518 +/- 4 Ma. This age constrains the termination of deformation within the Paraguay Belt and the final accretion of the supercontinent Gondwana. (C) 2011 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.

Temporal variability of chlorophyll-a in the São Vicente estuary

Estuaries are extremely dynamic environments that are vulnerable to anthropogenic alterations. Thus, monitoring phytoplankton abundances and composition is an essential tool for the prediction of eutrophication and its effects on coastal ecosystems. Phytoplankton biomass, as chlorophyll-a, in the São Vicente estuary (Brazil) varies in response to tidal cycles and seasonal rainfall. Objectives. To present two datasets designed to assess the relationship between chlorophyll-a and changes in water turbidity driven by tide and rain. Methods. Weekly observations were made in the shallow embayment (February to September 2008; site 1) and observations recorded on alternate days (summer 2010, site 2). Results. At site 1, turbidity differed between high and low tides, but on most days was over 3000 RU, maintaining moderate chlorophyll-a levels (4 mg.m-3) and only two blooms developed during low turbidity. Site 2 mean turbidity was 1500 RU, nutrient level was higher during neap tides and phytoplankton blooms were mainly observed at the end of neap tides at 15-day intervals, dominated by chain-forming diatoms and occasionally flagellates and pennate diatoms. Conclusions. Taxonomic composition of the blooms was different and their frequency altered by events characterized by intense freshwater discharges from the Henry Borden Hydroelectric Dam (> 9*106.m³), inhibiting phytoplankton accumulation during neap tide periods.

Contribution to the biology and fishery of the deep-water red crab, Chaceon Affinis (A. Milne-Edwards & Bouvier, 1894) (Decapoda, Brachyura, Geryonidae) in deep waters of the Canary Islands (Central-East Atlantic)

[EN] This crab was captured in the whole range of depths sampled, although its highest abundance was found between 600 and 800 m, on muddy-rocky bottoms. Moreover, significant differences were observed in the average weight and length, according to depth of capture, island of origin, and date of survey. In general, the b parameter of length-weight relationship indicates a negative allometric growth pattern, although in some cases it was not statistically different from isometry, particularly in males. Males were heavier, larger, and more abundant in catches than females.

La poesía de Domingo López Torres: hacia el surrealismo en Canarias

[ES] A causa de su militancia en el partido socialista, el poeta canario Domingo López Torres (1910-1937) murió asesinado en los inicios de la Guerra Civil española tras permanecer varios meses en prisión. Su compromiso no sólo fue político, sino también literario. Enemigo de todo tradicionalismo, simpatizó con aquellas tendencias estética s renovadoras que incorporaban los estilos, las ideas y conductas más progresistas de la Europa de los años 30, llegando a desempeñar un papel vital en el proceso de recepción del surrealismo en la isla de Tenerife. Este artículo describe el paulatino acercamiento de López Torres al movimiento vanguardista liderado por André Breton. Con ese objetivo se analizan sus dos obras fundamentales: Diario de un sol de verano y Lo imprevisto , ambas inéditas hasta 1987 y 1981, respectivamente. Mientras el primer volumen, escrito hacia 1929, conecta con los principios del Ultraísmo, con el regionalismo postulado por su paisano Pedro García Cabrera, con la “poesía pura” de Juan Ramón JJiménez o con las facetas neopopulistas de García Lorca y de Alberti, el segundo, compuesto en la cárcel de Fyffes poco antes de morir, revela ya el uso de imágenes y procedimientos abiertamente sur realistas.

La poética del compromiso: Jesús López Pacheco, del compromiso social al compromiso ecológico

Director: José Manuel Marrero Henríquez. Programa de doctorado: deLLcoS, Estudios lingüísticos y literarios en sus contextos socioculturales