Browsing by Author "Callapez, Pedro M."
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- Composition of lower cretaceous mudstones of the Algarve basin and implications for Iberian palaeoclimatesPublication . Dinis, Pedro A.; Carvalho, Joel; Callapez, Pedro M.; Mendes, Mario Miguel; Santos, Vanda F.; Manuel Carvalho Fernandes, PauloSeveral compositional features of mudstones are controlled by climate-driven weathering and have been used to approximate palaeoclimatic conditions. Mudstone composition, however, is also influenced by the geology of the source areas and diverse depositional and post-depositional processes. The present geochemical and mineralogical study of the Lower Cretaceous (upper Hauterivian to Aptian) of the Algarve Basin (Southern Portugal) was performed to investigate the main factors that control mudstone composition and extract possible climatic signals. Clay mineralogy partially reflects diverse contributions of felsic vs. mafic and recycled materials, and the geochemical weathering proxies applied to the detrital component of mudstones are differently affected by provenance and hydraulic fractionation. Despite these facts, a wide set of compositional data allows some robust climatic interpretations. Apart from the early Aptian (Burgau Formation), when climate was probably wetter, hot and dry conditions prevailed in south Iberia during the investigated interval, with minimum humidity during the late Hauterivianeearly Barremian (Salema Formation). Independent sedimentological and palaeontogical data support these interpretations. A comparison with compositional results for the Lusitanian Basin reveals substantially drier climates in southern than central and northern Iberia. Interpreted patterns of climatic evolution can be linked to shifts in air circulation from the sub-tropical high-pressure belt. (C) 2020 Elsevier Ltd. All rights reserved.
- Study of the malacofauna found in the main hall of the Islamic palace of Silves Castle (Algarve, Portugal)Publication . Silva, Solange; Callapez, Pedro M.; Gomes, Rosa Varela; Valente, Maria João; Carvalho, António FaustinoDuring an archaeological intervention carried out in the main palace hall of Silves Castle, in 2006, abundant malacological fauna was exhumed, contributing to the reconstitution of diets and cultural practices of the medieval populations that lived here. It was possible to count a minimum number of 5547 individuals, from 20 taxa of bivalve and gastropod molluscs, and cirriped crustaceans. This sample consists mainly of clams (Ruditapes decussatus) corresponding to 86.9% of the collection. The relative abundance and palaeoecological analysis suggest local subsistence practices and eating habits, related to the exploitation and consumption of edible molluscs collected from estuarine areas of the Arade river. These focused mainly on the capture of clams (R. decussatus), common cockles (C. edule), mussels (M. galloprovincialis), and fl at oysters (O. edulis).