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| | Abstract | | The recent growth of world-wide requirement of metals demands advanced explorations for finding metal mine and deposits. Here we propose a new way for exploration of buried submarine massive sulphides with marine controlled-source electromagnetic technique. We demonstrated feasibility studies using various marine electromagnetic soundings such as magnetometric resistivity survey, CSEM survey and marine DC resistivity survey. As a result, we confirmed that the electromagnetic responses of each marine electromagnetic survey are very sensitive to the conductive layer simulating the submarine massive sulphide deposits, which is buried at the depth of several tens meters. For example, the CSEM method with short source dipole length of 5m makes anomalous attenuation of magnetic field with a source-receiver separation larger than 50m. On the basis of numerical calculations, we conclude that the CSEM techniques, especially using magnetic field as received responses, can be used for imaging the sub-seafloor sulphide deposits. The result implies us a new CSEM survey with the very short source dipole, which is able to be applicable with ROVs and AUVs. |
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