[Rome. Ostia moderna]

Référence bibliographique : Weigert, 307

[Rome. Ponte Salario]

Référence bibliographique : Weigert, 652

[Rome. Ponte Salario]

Référence bibliographique : Weigert, 653

[Velletri. Museo Borgiano]

Référence bibliographique : Weigert, 727

[Rome. Environs]

Référence bibliographique : Weigert, 722

Un anillo de oro con inscripción del Museo Histórico de Baena (Córdoba)

En este artículo se presenta un anillo de oro con inscripción inédito, adscrito a las élites cristianas de la Antigüedad tardía, sin contexto arqueológico conocido, aunque probablemente su marco geográfico corresponda a algunos de los núcleos urbanos ubicados junto al Salsum en la provincia romana de Baetica, un territorio donde la existencia de otros testimonios textuales y arqueológicos parece indicar una temprana aceptación y expansión del cristianismo. Esta pieza pertenece en la actualidad al Museo Histórico de Baena.

Un vaso apulo del estilo de figuras rojas en el Museo Episcopal de Vic (Barcelona)

Previo al inicio de nuestro estudio es obligado un recuerdo, y que éste sirva de pequeño homenaje al recientemente fallecido doctor Mons. Eduard Junyent Subid., Director de la Biblioteca-Archivo Episcopal y del Museo Astístico Arqueológico Episcopal de la ciudad de Vic, miembro de la Real Academia de las Buenas Letras de Barcelona, arqueólogo e ilustre historiador.

Juxtaposition of melt impregnation and high-temperature shear zones in the upper mantle; field and petrological constraints from the Lanzo peridotite (Northern Italy)

Results of a field and microstructural study between the northern and the central bodies of the Lanzo plagioclase peridotite massif (NW Italy) indicate that the spatial distribution of deformation is asymmetric across kilometre-scale mantle shear zones. The southwestern part of the shear zone (footwall) shows a gradually increasing degree of deformation from porphyroclastic peridotites to mylonite, whereas the northeastern part (hanging wall) quickly grades into weakly deformed peridotites. Discordant gabbroic and basaltic dykes are asymmetrically distributed and far more abundant in the footwall of the shear zone. The porphyroclastic peridotite displays porphyroclastic zones and domains of igneous crystallization whereas mylonites are characterized by elongated porphyroclasts, embedded between fine-grained, polycrystalline bands of olivine, plagioclase, clinopyroxene, orthopyroxene, spinel, rare titanian pargasite, and domains of recrystallized olivine. Two types of melt impregnation textures have been found: (1) clinopyroxene porphyroclasts incongruently reacted with migrating melt to form orthopyroxene plagioclase; (2) olivine porphyroclasts are partially replaced by interstitial orthopyroxene. The meltrock reaction textures tend to disappear in the mylonites, indicating that deformation in the mylonite continued under subsolidus conditions. The pyroxene chemistry is correlated with grain size. High-Al pyroxene cores indicate high temperatures (11001030C), whereas low-Al neoblasts display lower final equilibration temperatures (860C). The spinel Cr-number [molar Cr/(Cr Al)] and TiO2 concentrations show extreme variability covering almost the entire range known from abyssal peridotites. The spinel compositions of porphyroclastic peridotites from the central body are more variable than spinel from mylonite, mylonite with ultra-mylonite bands, and porphyroclastic rocks of the northern body. The spinel compositions probably indicate disequilibrium and would favour rapid cooling, and a faster exhumation of the central peridotite body, relative to the northern one. Our results indicate that melt migration and high-temperature deformation are juxtaposed both in time and space. Meltrock reaction may have caused grain-size reduction, which in turn led to localization of deformation. It is likely that melt-lubricated, actively deforming peridotites acted as melt focusing zones, with permeabilities higher than the surrounding, less deformed peridotites. Later, under subsolidus conditions, pinning in polycrystalline bands in the mylonites inhibited substantial grain growth and led to permanent weak zones in the upper mantle peridotite, with a permeability that is lower than in the weakly deformed peridotites. Such an inversion in permeability might explain why actively deforming, fine-grained peridotite mylonite acted as a permeability barrier and why ascending mafic melts might terminate and crystallize as gabbros along actively deforming shear zones. Melt-lubricated mantle shear zones provide a mechanism for explaining the discontinuous distribution of gabbros in oceancontinent transition zones, oceanic core complexes and ultraslow-spreading ridges.

La depuración del personal del Museo Arqueológico de Barcelona y del Servicio de Investigaciones Arqueológicas después de la Guerra Civil (1939-1941)

Al finalizar la Guerra Civil española (1936-1939), el personal del Museu d' Arqueologia y de la Secció d'Excavacions i Arqueologia del Servei del Patrimoni Artístic, Historic i Científic (SPAHC) de la suprimida Generalitat de Catalunya fue sometido a depuración por parte del Juzgado Militar Especial de Funcionarios de la Diputación Provincial de Barcelona. La llegada como nuevo director de Martín Almagro Basch, en substitución del exiliado Pere Bosch Gimpera, y el resultado de la reorganización subsiguiente marcaron el desarrollo de la investigación arqueológica en Cataluña hasta finales de la década de 1960.

[Volterra. Museo etrusco Guarnacci]

Référence bibliographique : Weigert, 750a

[Volterra. Museo etrusco Guarnacci]

Référence bibliographique : Weigert, 750b