Zircon U-Pb and Hf isotopic constraints on the genesis of a post-kinematic S-type Variscan tin granite: the Logrosán cupola (Central Iberian Zone)

The Variscan orogeny produced widespread granites along the European Variscan belt. In relation to crustal thickening, post-collisional multiple tin-bearing highly fractionated S-type leucogranites were emplaced. The Logrosán granite represents one of those granitic bodies and is a focus of this study. The Logrosán granite is located in the Central Extremadura Batholith (CEB), within the Central Iberian Zone (CIZ) and was emplaced during post kinematic stages of the Variscan orogeny at ca. 308 Ma, as determined by combined ID-TIMS U–Pb and LA-ICPMS geochronology. The granitic body intruded the metasedimentary Schist Greywacke Complex (SGC) of Neoproterozoic age. A moderately evolved medium- to coarse-grained two mica leucogranite (Main unit) and some highly evolved aplitic or microporphyritic units (evolved units) are distinguishable on the basis of their petrography and whole rock geochemistry.  Initial 87Sr/86Sr ratios vary from 0.7134 to 0.7311, whereas initial εNd shows a restricted range from -4.3 to -4.0 and εHf(t) ranges from  +2.0 to -4.6 for Variscan-age zircons. Inherited zircons exhibit mostly Neoproterozoic ages and juvenile Hf-isotope composition (eHf up to +14.6), analogous to that of zircons from the SGC metasediments. The available geological, geochronological, geochemical and isotopic data allow to propose the partial melting of heterogeneous Neoproterozoic metasedimentary material, similar to the outcropping SGC, for the genesis of the Logrosán granite.La orogenia Varisca produjo una gran cantidad de granitos a lo largo del Cinturón Varisco Europeo. En relación con el engrosamiento cortical se emplazaron tardíamente granitos de tipo-S, muy fraccionados y ricos en Sn. El presente estudio se centra en uno de esos cuerpos graníticos, el granito de Logrosán. El plutón de Logrosán forma parte del Batolito de Extremadura Central (BEC), en la Zona Centroibérica (ZCI), y se emplazó durante las etapas tardías de la orogenia Varisca, a los ca. 308 Ma, según los datos combinados de geocronología de U-Pb por ID-TIMS y por LA-ICPMS. El cuerpo granítico intruyó los metasedimentos del Complejo Esquisto Grauváquico (CEG) de edad fundamentalmente Neoproterozoica. En el plutón se distinguen, de acuerdo a la petrografía y a la geoquímica de roca total, un leucogranito de dos micas de tamaño de grano medio-grueso moderadamente evolucionado (Main Unit) y varias unidades aplíticas o microporfídicas altamente evolucionadas (Evolved Units). Las relaciones isotópicas iniciales de 87Sr/86Sr varían de 0.7125 a 0.7286, mientras que el εNd inicial muestra un rango restringido de -4.3 a -4.0 y el εHf(t) en circones variscos oscila de +5.7 a -10.5. Los circones heredados del granito de Logrosán muestran edades principalmente Neoproterozoicas y composiciones isotópicas de Hf juveniles (εHf > +14.7), análogas a las encontradas en los circones del CEG. Los datos geológicos, geoquímicos, geocronológicos e isotópicos de los que se dispone sugieren que el granito de Logrosán se originó por la fusión parcial de materiales metasedimentarios Neoproterozoicos similares a los del CEG

Description of Warileya lumbrerasi n. sp. (Diptera: Psychodidae) from Peru

Warileya lumbrerasi n. sp. is described from the northern Peruvian Andes. This species was collected inside houses, and is the seventh species described within the genus Warileya Hertig, 1948

The evolution of the subcontinental mantle beneath the Central Iberian Zone: Geochemical tracking of its mafic magmatism from the Neoproterozoic to the Cenozoic

Continental lithosphere is modified over eons in response to large-scale tectonic processes, such as rifting and collisions. The lithospheric mantle beneath central Iberia was affected by multiple Neoproterozoic to Cenozoic events including two orogenic cycles. However, the details of this evolution, and the relationship of the Iberian lithosphere to that beneath central Europe remains poorly constrained. We have compiled a trace element and isotope (Sr-Nd-Pb) data set (n = 230) regarding the main ten mafic magmatic episodes that intruded the central-western Iberia basement during a 575 Ma age range. In this long period, two orogenic events with accompanying mafic calc-alkaline magmatism (Cadomian and Variscan cycles) were followed by eight intraplate, alkaline or tholeiitic, magmatic inputs. The two orogenic episodes have subordinate mafic intrusions associated to a more voluminous felsic magmatism, which highlights both the major intracrustal recycling promoted and the significant crustal thickening accompanying these convergence tectonic events. Nevertheless, only minor crustal subduction signatures within deep mantle are observed in mafic magmas or mantle xenoliths after those two orogenic cycles, and the existence of an old (pre-Neoproterozoic) enriched subcontinental mantle beneath central Iberia is suggested. Mantle-derived magmas from central European basement terranes (Bohemian to Armorican-French Massif Central massifs) show a marked contrast of geochemical tracers during the same long time record. They show more juvenile and depleted mantle sources during the pre-Variscan times indicating their farther distance to continental Gondwana than the studied central Iberian terrane. Thus, the change in Nd isotopes and model ages associated with the Variscan orogeny is more abrupt in central European terranes. This collisional event was followed by the arrival of broadly similar mafic magmas in both southwestern and central European terranes, implying substantial crust-mantle interaction across a wide geographical area. The post-Variscan mafic magmatism, mainly from Cretaceous time, suggests a lithospheric mantle rejuvenation by widespread asthenospheric upwelling throughout these western circum-Mediterranean areas. However, the presence of minor episodes of intraplate K-rich alkaline magmatism involving enriched lithospheric mantle sources in the southernmost Mediterranean Europe marks a contrast, suggesting a complex lithospheric/asthenospheric mantle flow regime in these areas during post-collisional convergence between Africa and Eurasia

Condición física de futbolistas adultos y jóvenes de un equipo profesional de Nicaragua

En la actualidad, el fútbol es un deporte que demanda un alto desempeño físico, por lo que conocer las características de la condición física en las distintas categorías de desarrollo se hace fundamental para conducir un óptimo proceso de entrenamiento, de modo que, el objetivo de este estudio es evaluar la condición física de futbolistas de un club profesional de Nicaragua, según la categoría de edad en las cuales se desempeñaban. El presente es un estudio de tipo descriptivo, comparativo, de la condición física de 187 futbolistas, de edades entre 13 y 31 años, distribuidos por categoría según año de nacimiento y plantel profesional. El grupo PRO presenta mayor rendimiento en comparación a las categorías U13, U15, U17 y U21 (p < 0,001) en tiempo sprint lineal 10 metros (F = 71 y TE = 0,71), 30 metros (F = 85 y TE = 0,70), velocidad de tiro (F = 171 y TE = 0,81), Tiempo en test agilidad de Illinois (F = 77 y TE = 0,72) y metros recorridos en Yo-Yo de recuperación intermitente nivel 1 (F = 121 y TE = 0,73). Se puede concluir que existe un mayor rendimiento de los aspectos físicos por parte de las categorías de mayor edad. Estos resultados pueden servir de referencia o de parámetros de comparación de rendimiento físico de jugadores jóvenes y adultos a nivel nacional de Nicaragua