Los recursos hídricos superficiales del Alto Aragón

Bibliografía: p. 223-224. -- Índice

Tectono-thermal history of an exhumed thrust-sheet-top basin : an example from the south Pyrenean thrust belt

This paper presents a new balanced structural cross-section of the Jaca thrust-sheet-top basin of the southern Pyrenees combined with paleo-thermometry and apatite fission track (AFT) thermochronology data. The cross-section, based on field data and interpretation of industrial seismic reflection profiles, allows refinement of previous interpretations of the south-directed thrust system, involving the identification of new thrust faults, and of the kinematic relationships between basement and cover thrusts from the middle Eocene to the early Miocene. AFT analysis shows a southward decrease in the level of fission track resetting, from totally reset Paleozoic rocks and lower Eocene turbidites (indicative of heating to Tmax>~120°C), to partially reset middle Eocene turbidites and no/very weak resetting in the upper Eocene-lower Oligocene molasse (Tmax<~60°C). AFT results indicate a late Oligocene-early Miocene cooling event throughout the Axial Zone and Jaca Basin. Paleo-maximum temperatures determined by vitrinite reflectance measurements and Raman spectroscopy of carbonaceous material reach up to ~240°C at the base of the turbidite succession. Inverse modelling of AFT and vitrinite reflectance data with the QTQt software for key samples show compatibility between vitrinite-derived Tmax and the AFT reset level for most of the samples. However, they also suggest that the highest temperatures determined in the lowermost turbidites correspond to a thermal anomaly rather than burial heating, possibly due to fluid circulation during thrust activity. From these results, we propose a new sequential restoration of the south Pyrenean thrust system propagation and related basin evolution

La meteorología en la investigación ecológica de montaña

La presente publicación recoge los temas desarrollados, los problemasplanteados, y las soluciones a ello apuntadas en las XIIIJornadas Científicas de la Asociación Meteorológica Española yI Simposio Nacional de Meteorología de Alta Montaña celebradosen Jaca del 4 al 9 de mayo de 1982, con el patrocinio del ExcelentísimoSr. Ministro de Transportes, Turismo y Comunicaciones encolaboración con el Instituto Nacional de Meteorología y bajo laPresidencia de Honor de S. M. el Rey Don Juan Carlos I