The chemical composition of medieval wood ash glass from Central Europe
K. H. Wedepohl|Klaus Simon
Medieval wood ash glass classified as 6 early medieval glasses, 17 5 lime 7 glasses and 9 mixed alkali has been analyzed by microprobe ICP-mass spectrometry on 61 elements. Their calcium oxide to potassium ratio (CaO/K2O) increases from late according an increase of the proportion twigs in bulk amount (logs plus twigs). Twigs because their relatively large bark contain more than logs. The CaO/K2O not yet evaluated excavations can be used for dating. observation that 25 minor elements Be, Sc, V, Cr, Ge, Y, Nb, REE (La Lu), Ta, W Bi occur almost equal concentrations five subtypes makes it highly probable these were introduced into starting mixtures means quartz quartz-rich sand with heavy minerals. majorities so-called europium anomalies within group rare-earth (REE). Eu normalized those Continental Earth's Crust are lower samarium gadolinium concentrations. These apparently inherited granitic source upper Crust. Soda soda other major types history no anomaly. Therefore a different caused this important element constellation types. K, Cu, Rb S physiologically separated Ca, P, Mn, Sr B during growth bark, respectively, trees. Different sources metals Cu Co colouring our report.
Geochemistry