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A reconnaissance study of ten selected high temperature systems along the Banda Arc Island chain showed that half of them discharge only steam heated waters and some acidic condensates with rather small flow rates.Discharged neutral (pH) bi-carbonate and neutral and acidic sulphate waters were identified as ‘shallow waters’ which in diagrams of K/Mg equilibrium temperature versus SiO2 content cluster together near the amorphous silica species field.Inputs by‘deeper fluids’can be recognised by their large isotopic 18O and D shifts as found at Wayang Windu, our chosen reference system on Java, and at Mataloko on Flores.Large outflows (up to 400 kg/s) of acidic sulphate waters without anomalous isotopic signature have been found in the foothill region of two active volcanoes, at Nage in the Bajawa Field for example.Neutral (pH) NaCl waters are discharged near the toe of concealed, deep outflows of three liquid dominated systems on Flores and Alor Island;their silica content is controlled by equilibration with chalcedony.