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Investigations have been carried out on crater lakes in areas of recent volcanism in the Azores and in Italy, with the aim of detecting possible evidence of residual anomalies associated with past volcanic activities; data from crater lakes of Cameroon have been considered for comparison. Among the physical chemical characters taken into account, the increases of temperature, ammonium and dissolved carbon dioxide with depth are interpreted as providing information about the contribution ofdoi:10.2343/geochemj.28.173 fatcat:2lu4ro4xsbgf7iutzb54rmwhpm