Hekla cold springs (Iceland): groundwater mixing with magmatic gases.
We have analysed the chemical and stable isotope compositions of four spring waters situated just northwest of the Hekla volcano, where cold water emerges from the base of the lava flows. The stable isotope ratios of water (H, O), dissolved inorganic carbon (C) and sulphate (S) were used to determine whether magmatic gases are mixing with the groundwater. The waters can be characterised as Na-HCO(3) type. The results show that deep-seated gases mix with groundwater, substantially affecting the concentration of solutes and the isotopic composition of dissolved carbon and sulphate.
Holm
Nils G
NG
Department of Geological Sciences, Stockholm University, Stockholm, Sweden.
Gislason
Sigurour R
SR
Sturkell
Erik
E
Torssander
Peter
P
D002244:Carbon / Q000032:analysis; D003080:Cold Temperature; D005740:Gases / Q000737:chemistry*; D019015:Geologic Sediments / Q000737:chemistry*; D006859:Hydrogen / Q000032:analysis; D007055:Iceland; D010100:Oxygen / Q000032:analysis; D017693:Sodium Bicarbonate / Q000032:analysis; D013431:Sulfates / Q000032:analysis; D018707:Volcanic Eruptions; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014881:Water Supply / Q000032:analysis*
D005740:Gases; D013431:Sulfates; D014874:Water Pollutants, Chemical; D002244:Carbon; D006859:Hydrogen; D017693:Sodium Bicarbonate; D010100:Oxygen