Fluid geochemistry of Ambon Island (Indonesia)

The hot spring waters discharging in the Tulehu peninsula of Ambon island\ Indonesia\ vary in composition from Na Cl!type to Na Cl HCO2!type[ Most chemical characteristics of the Na Cl!type waters are typical of liquids circulating in high!enthalpy geothermal reservoirs[ Mixing trends in the plots of alkali vs Cl suggest the existence of a parent geothermal liquid with Cl content of 03\999 mg:kg[ The Na K geothermometer indicates deep temperatures of 129 134>C[ The parent liquid cools through conduction and:or mixing with cold\ low!salinity groundwaters[ Sodium Cl HCO2!type waters originate from dilution of the parent liquid accompanied by water rock interaction under high PCO1 conditions[ 0888 CNR[ Published by Elsevier Science Ltd[ All rights reserved