Gas composition and hydrochemistry of bottom waters of the Bay of Plenty in the hydrothermally active zone of the Pacific island arc are investigated. Methane content in underwater vents is an order of magnitude greater than that in volcanic exhalations on the land. Salinity, pH, total content of CO2, its partial pressure, and silica content also differ. Correlations between gas parameters, hydrochemical parameters, and biological and microbiological parameters are identified.

Supplement to: Propp, L N; Obzhirov, Anatoly I; Propp, Mikhail V (1992): Gas anomalies and hydrochemical anomalies in bottom water in an area of volcanic activity (Bay of Plenty, New Zealand). Oceanology, 32(4), 463-468