Conductivity spike in Skjálftandafljót glacier river

Last week there was an conductivity spike in Skjálfandarfljót glacier river. It is not clear what did create this conductivity spike that was detected and it’s unknown what volcano or hydrothermal area was leaking water into the river. No glacier flood did follow this spike and no extra activity was detected following this. This conductivity spike was detected on the Thursday 22-November-2013 at 20:20 UTC.