| 4 | New records of submarine hydrothermal activity in middle part of the Okinawa Trough显示文摘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 | Zhao, YY Zhai, SK Li, RZ Li, FY Gao, AG He, LJ Wang, ZG Zhu, XQ | 1997 | Chinese Science Bulletin1997，42，7： | 1 |
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