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| | Abstract | | The recent growth of world-wide requirement of metals demands advanced explorations for finding metal mine and deposits. On the basis of the feasibility studies, we developed instruments for the marine controlled-source electromagnetic (CSEM) survey with autonomous underwater vehicle (AUV) or remotely operated vehicle(ROV), on which a transmitter was attached. By using ROV, we could image shallow resistivity structure around a submarine massive sulfide (SMS) deposits located off Okinawa, southwest of Japan. The AUV-CSEM survey also gave us deeper sub-seafloor resistivity information around another SMS at the Izu-Bonin island arc, south of Japan. Here, we report the preliminary results of ROV and AUV surveys around the SMS, and demonstrate that our electromagnetic survey systems elucidate the conductive feature around the SMS deposits. |
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