Table 3: Isotopic and chemical composition of glasses from Maroneia, 4th–6th centuries AD in age. Note that CoO, NiO, CuO, ZnO, SnO2, Sb2O3, and PbO contents are not reported because they are lower than EMPA detection limits for all samples (LOD of CoO, NiO and CuO = 0.03 wt%; LOD of ZnO, SnO2, Sb2O3 = 0.04 wt%; LOD of PbO = 0.08 wt%).

Sample18OSiO2Na2OCaOAl2O3K2OMgOFeOTiO2MnOP2O5SO3Cl
Number(VSMOW)Wt%Wt%Wt%Wt%Wt%Wt%Wt%Wt%Wt%Wt%Wt%Wt%

1-215.467.1117.397.842.290.611.101.060.151.540.070.301.02
2-215.566.2317.807.832.700.761.231.330.171.230.150.310.92
3-215.664.6217.708.982.400.721.471.040.161.820.120.340.92
4-215.965.6418.467.952.700.821.211.380.160.960.130.320.91
5-215.665.7017.388.252.380.591.210.880.151.690.090.340.95
6-215.666.7917.177.502.530.601.250.980.161.840.080.301.00
7-215.764.6317.969.072.570.711.501.100.181.720.130.330.92
8-215.265.5617.567.522.500.651.250.930.172.340.090.291.01
9-216.066.1318.147.832.730.841.221.280.150.990.160.340.90
10-215.366.5916.368.592.400.691.110.880.171.600.110.360.87

mean isotopic composition