The clay minerals are therefore thought to represent the regional chemical composition and the chemical transport of the geothermal fluid rather than the chemical composition of the host rock of the clay minerals.
Leirsteindir virðast því frekar endurspegla efnasamsetningu myndunarumhverfisins og efnaflutning jarðhitavökvans fremur en efnasamsetningu grannbergsins sem leirsteindirnar myndast í.