Abstract
Surface water manifestations in the vicinityof the Inielika volcano complex have been investigated by the geochemical analysis of samples obtained from spring and river waters located on an almost straight line connecting the summit of the volcano, manifestations at lower altitudes in the Gou area and manifestations at still lower altitudes in the Mengeruda area with a maximum distance about 12 km east of the volcano. All water samples have been analyzed for major and trace elements. The concentrations of major, trace and rare-earth elements of the water geothermal manifestations are temperature and pH dependences. They are also controlled by the nature of the complexation ligands, the patterns of the original primary minerals in rock that is subject to leaching or dissolution, glass and magmatic minerals, the dominant phases that control REE behaviour in volcanic areas, fractionation of secondary minerals during rock alteration, and a combination of mechanisms, which can be easily envisaged under natural conditions.
