Values from McGarvie et al., 2007; *Values from McGarvie et al., 1990 † Table 3. Volatile concentrations for Torfajökull and Prestahnúkur rhyolites as determined by Cameca NanoSIMS 50L (OU). All concentrations are reported as ppm except water which is given in weight %. Unit H2O ± CO2 ± F ± Cl ± S ± Commentt n Bláhnúkur TJ/98-40 0.69 0.01 nd 1690 40 2000 120 6 1 6 p TJ/98-39 < 0.1 < 5 80 5 nd nd 5 mc, het Haskerðingur TJ/98-6 0.08 0.01 nd 1650 90 1300 80 18 1 8 p Kaldaklofsjöll TJ/98-50 0.40 0.08 640 110 250 40 30 10 120 7 5 pem, het Hábarmur TJ/97-14 0.13 0.03 7800 2200 1320 160 290 100 30 5 8 pem, het TJ/97-15 0.09 0.01 nd 1780 40 1620 50 45 1 8 p Hrafntinnusker HSK-12 0.09 0.01 nd 1740 10 1590 20 45 5 6 p HSK-32 0.08 0.01 nd 1600 30 1760 80 10 3 4 p Prestahnúkur PK-1 0.12 0.01 nd 840 10 460 10 nd 6 p PK-6 0.13 0.01 nd 880 10 430 10 nd 6 p PK-7 0.11 0.01 nd 900 10 450 20 nd 6 p p, taken as residual (degassed), unaltered; pem = post-eruption modification; het = heterogeneous; mc = microcrystalline; n = number taken in average; bd = below detection Table 4. Summary of new ages for Torfajökull and Prestahnúkur rhyolites. Errors are 2σ. Refer to section 3.2 for full analytical details. Apparent ages in parentheses indicate altered sample which may have been
† Values from McGarvie et al., 2007; *Values from McGarvie et al., 1990 Table 3. Volatile concentrations for Torfajökull and Prestahnúkur rhyolites as determined by Cameca NanoSIMS 50L (OU). All concentrations are reported as ppm except water which is given in weight %. Unit H2O ± CO2 ± F ± Cl ± S ± Commentt n Bláhnúkur TJ/98-40 0.69 0.01 nd 1690 40 2000 120 6 1 p 6 TJ/98-39 < 0.1 < 5 80 5 nd nd mc, het 5 Haskerðingur TJ/98-6 0.08 0.01 nd 1650 90 1300 80 18 1 p 8 Kaldaklofsjöll TJ/98-50 0.40 0.08 640 110 250 40 30 10 120 7 pem, het 5 Hábarmur TJ/97-14 0.13 0.03 7800 2200 1320 160 290 100 30 5 pem, het 8 TJ/97-15 0.09 0.01 nd 1780 40 1620 50 45 1 p 8 Hrafntinnusker HSK-12 0.09 0.01 nd 1740 10 1590 20 45 5 p 6 HSK-32 0.08 0.01 nd 1600 30 1760 80 10 3 p 4 Prestahnúkur PK-1 0.12 0.01 nd 840 10 460 10 nd p 6 PK-6 0.13 0.01 nd 880 10 430 10 nd p 6 PK-7 0.11 0.01 nd 900 10 450 20 nd p 6 p, taken as residual (degassed), unaltered; pem = post-eruption modification; het = heterogeneous; mc = microcrystalline; n = number taken in average; bd = below detection Table 4. Summary of new ages for Torfajökull and Prestahnúkur rhyolites. Errors are 2σ. Refer to section 3.2 for full analytical details. Apparent ages in parentheses indicate altered sample which may have been
CHEMGE_7792_Ms_Revised.docx