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THE hydrothermal activity area investigated is located at the middle of the trough (126°50′—127°30′E; 27°20′—27°50′N). Some surface sediment samples and core samples were collected, with other samples from non-hydrothermal activity area (128°20′—129°10′E; 30°30′—31°40′N) in the north of the trough for comparison. Analyses for elements and iso
THE hydrothermal activity area investigated is located at the middle of the trough (126 ° 50’-127 ° 30’E; 27 ° 20’-27 ° 50’N). Some surface sediment samples and core samples were collected with other samples from non-hydrothermal activity area (128 ° 20’-129 ° 10’E; 30 ° 30’-31 ° 40’N) in the north of the trough for comparison. Analyzes for elements and iso