TEM investigations of South Atlantic Ridge 13.2°S hydrothermal area |
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| Authors: | TAO Chunhui XIONG Wei XI Zhenzhu DENG Xianming and XU Yixian |
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| Institution: | The Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Key Laboratory of Submarine Science, the Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;The Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Key Laboratory of Submarine Science, the Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China;School of Geosciences and InfoPhysics, Central South University, Changsha 410083, China;The Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Key Laboratory of Submarine Science, the Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China |
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| Abstract: | According to the exploration contract about polymetallic sulfides in the SWIR (Southwest Indian Ridge) signed by China with the International Seabed Authority, to delineate sulfide minerals and estimate resource quantity are urgent tasks. We independently developed our first coincident loop Transient Electromagnetic Method (TEM) device in 2010, and gained the TEM data for seafloor sulfide at South Atlantic Ridge 13.2°S in June 2011. In contrast with the widely applied CSEM (Marine controlled-source electromagnetic) method, whose goal is to explore hydrocarbons (oil/gas) of higher resistivity than seawater from 102 to 103 m below the sea floor, the TEM is for low resistivity minerals, and the target depth is from 0 to 100 m below the sea floor. Based on the development of complex sulfide geoelectrial models, this paper analyzed the TEM data obtained, proposing a new method for seafloor sulfide detection. We present the preliminary trial results, in the form of apparent resistivity sections for both half-space and full-space conditions. The results correspond well with the observations of the actual hydrothermal vent area, and the detection depth reached 50-100m below the bed, which verified the capability of the equipment. |
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| Keywords: | transient electromagnetic method mid-ocean ridge hydrothermal activity seafloor polymetallicsulfides South Atlantic Ridge |
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