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- W759340984 abstract "The atmospheric components of past climatic changes are often constrained from ice records of polar ice sheets. In this study, we propose an alternative method based on analyses of atmospheric gases trapped in bubbles of archaeological glasses from the Western Europe and dated between the Ist century BC and the present. Indeed, during the shaping of ancient glasses, bubbles are created in glass paste (melting and glass-paste degassing), or from the step of glass working in open air, where the surrounding atmosphere could be trapped. In first time, our geochemical approach evidences the evolution in time of physical and chemical properties of archaeological glasses, linked with evolution of glassmaking processes. In second time, the study of VSD of these glasses show a bimodal size bubbles distribution in flat glasses and an unimodal in the other kind of glasses. Geochemical analyses of major gases included in bubbles in flat glasses, show a chemical dichotomy between two groups of bubbles, independent of chemical composition of glass paste. The smallest bubbles are exclusively composed of CO2, whereas the largest are rich in N2 (~80%), poor in CO2 (~15%), contained Ar (~1%), and sometimes O2, like-looking of an modified atmospheric composition. The excess of CO2 could be explained by mixing between atmospheric trapped gases and furnace/combustion gases, and/or chemical reaction with particular soots (observed by SEM). So, a discrimination between the contaminants and ancient atmospheric gases could be proposed using isotopic measurements of insert species like noble gases. The archaeological glasses could appears like a new complex source of archeo-climatic recording." @default.
- W759340984 created "2016-06-24" @default.
- W759340984 creator A5001714132 @default.
- W759340984 creator A5078065050 @default.
- W759340984 date "2012-01-01" @default.
- W759340984 modified "2023-09-28" @default.
- W759340984 title "Archéo-atmosphères terrestres : la mémoire des verres archéologiques, propriétés physico-chimiques, vésicules, gaz majeurs et gaz rares" @default.
- W759340984 hasPublicationYear "2012" @default.
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