Petrology and geochemistry of sideromelane glass shards from Pleistocene as layers north and south of Gran Canaria, supplement to: Gurenko, Andrey A; Schmincke, Hans-Ulrich (1998): Petrology, geochemistry, S, Cl and F abundances, and S oxidation state of sideromelane glass shards from Pleistocene ash layers north and south of Gran Canaria (ODP Leg 157). Contributions to Mineralogy and Petrology, 131(1), 95-110

Andrey A Gurenko & Hans-Ulrich Schmincke
Major elements, S, F, Cl concentrations and relative proportions of S6+ to total S were analyzed with electron microprobe in sideromelane glass shards from Pleistocene volcaniclastic sediments drilled during ODP Leg 157. Glasses are moderately to strongly evolved and represent a spectrum from alkali basalt, basanite and nephelinite through hawaiite, mugearite and tephrite to phonolitic tephrite. Measured S6+/SumS (0.03±0.98) and calculated Fe2+/Fe3+ (2.5±5.8) ratios in the melt yield preeruptive redox conditions ranging from NNO-1.4 to...
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