[Assise. Basilica di San Francesco]

Référence bibliographique : Weigert, 17

[Assise. Basilica di San Francesco, basilica superiore]

Référence bibliographique : Weigert, 18

[Assise. Basilica di San Francesco, basilica superiore]

Référence bibliographique : Weigert, 21

[Assise. Basilica di San Francesco, basilica superiore]

Référence bibliographique : Weigert, 20

Un santo. Un pueblo. Estudio de la devoción a San Pedro Bautista en San Esteban del Valle.

El conjunto del trabajo busca adentrarse desde la antropología, pero con la ayuda de otras disciplinas, en la devoción de San Esteban del Valle (Ávila) hacia San Pedro Bautista; franciscano natural del mismo pueblo que fue martirizado en Japón a finales del s. XVI. O dicho de otra manera, lo que se pretende mostrar es el rol que San Pedro Bautista ocupa en la forma en que la religión católica se ha configurado en este pueblo abulense.

[Monreale. Abbazia di San Martino delle Scale]

Référence bibliographique : Weigert, 212

[Palerme. Chiesa di San Giorgio dei Genovesi]

Référence bibliographique : Weigert, 312

[Assise. Basilica di San Francesco, basilica superiore]

Référence bibliographique : Weigert, 22

[Assise. Basilica di San Francesco, basilica superiore]

Référence bibliographique : Weigert, 24

[Orvieto. Pozzo di San Patrizio]

Référence bibliographique : Weigert, 301

[Pérouse. Duomo di San Lorenzo]

Référence bibliographique : Weigert, 327

Crystal size distribution of periclase in contact metamorphic dolomite marbles from the southern Adamello Massif, Italy

Crystal size distributions (CSD) of periclase in contact metamorphic dolomite marbles are presented for two profiles near the Cima Uzza summit in the southern Adamello Massif (Italy). The database was combined with geochemical and petrological information to deduce the controls on the periclase-forming reaction. The contact metamorphic dolomite marbles are exposed at the contact of mafic intrusive rocks and are partially surrounded by them. Brucite is retrograde and pseudomorphs spherical periclase crystals. Prograde periclase growth is the consequence of limited infiltration of water-rich fluid at T near 605C. Stable isotope data show depletion in (13)C and (18)O over a narrow region (40 cm) near the magmatic contact, whereas the periclase-forming reaction front extends up to 4 m from the contact. CSD analyses along the two profiles show that the median grain size of the periclase crystals does not change, but that there is a progressively greater distribution of grain sizes, including a greater proportion of larger grains, with increasing distance from the contact. A qualitative model, based on the textural and geochemical data, attributes these variations in grain size to changing reaction affinities along a kinetically dispersed infiltration front. This study highlights the need to invoke disequilibrium processes for metamorphic mineral growth and expands the use of CSDs to systems of mineral formation driven by fluid infiltration.

The thermal circuits of the Argentera Massif (western Alps, Italy): An example of low-enthalpy geothermal resources controlled by Neogene alpine tectonics

This work presents geochemistry and structural geology data concerning the low enthalpy geothermal circuits of the Argentera crystalline Massif in northwestern Italian Alps. I n this area some thermal springs (50-60 degreesC), located in the small Bagni di Vinadio village, discharge mixtures made up of a Na-Cl end-member and a Na-SO4 component. The latter is also discharged by the thermal springs of Terme di Valdieri located some kilometres apart within the same tectonic complex. Both end-members share the same meteoric origin and the same reservoir temperature, which is close to 150 degreesC. Explanations are thus required to understand how they reach the surface and how waters of the same origin and circulating in similar rocks can attain such different compositions. Sodium-sulphate waters discharged at both sites, likely represent the common interaction product of meteoric waters with the widespread granitic-migmatitic rocks of the Argentera Massif, whereas Na-CI waters originate through leaching of mineralised cataclastic rocks, which are rich in phyllosilicatic minerals and fluid inclusions, both acting as Cl- sources. Due to the relatively low inferred geothermal gradient of the region, -25C/km, meteoric waters have to descend to depths of 5.5-6 km to attain temperatures of similar to 150 degreesC. These relevant depths can be reached by descending meteoric waters, due to the recent extensional stress field, which allows the development of geothermal circulations at greater depths than in other sectors of the Alps by favouring a greater fractures aperture. The ascent of the thermal waters rakes place along brittle shear zones. In both sites, the thermal waters emerge at the bottoms of the valleys, close to either the lateral termination of a brittle shear zone at Terme di Valdieri, or a step-over between two en-echelon brittle shear zones at Bagni di Vinadio. These observations attest to a strong control operated on the location of outlet regions by both brittle tectonics and the minima in hydraulic potential inside the fractured massif.