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The Exploration Methodology of Seafloor Massive Sulfide Deposit by Use of Marine Geophysical Investigation  

Kim, Hyun-Sub (Deep-sea and Marine Georesources Research Department, Korea Ocean Research and Development Institute)
Jung, Mee-Sook (Deep-sea and Marine Georesources Research Department, Korea Ocean Research and Development Institute)
Kim, Chang-Hwan (East Sea Environment Research Department, Korea Ocean Research and Development Institute)
Kim, Jong-Uk (Deep-sea and Marine Georesources Research Department, Korea Ocean Research and Development Institute)
Lee, Kyeong-Yong (Deep-sea and Marine Georesources Research Department, Korea Ocean Research and Development Institute)
Publication Information
Geophysics and Geophysical Exploration / v.11, no.3, 2008 , pp. 167-176 More about this Journal
Abstract
Lau basin of the south Pacific, as an active back arc basin, is promising area bearing seafloor massive hydrothermal deposit that is located in a subduction zone between the Pacific ocean plate and Indo-Australian continental plate. We performed multi-beam bathymetry survey in the Lau basin using EM120, to find out high hydrothermal activity Bone. Fonualei Rift and Spreading Center (FRSC) and Mangatolou Triple Junction (MTJ) area were selected for precise site survey through seafloor morphology investigation. The result of surface and deep-tow magnetometer survey showed that Central Anomaly Magnetization High (CAMH) recorded which is associated with active ridge in FRSC-2 and revealed very low magnetic anomalies that can be connected to past or present high hydrothermal activity in MTJ-1 seamount area. Moreover, the physical and chemical tracers of hydrothermal vent flume, i.e., transmission, hydrogen ion concentration (pH), adenosine triphosphate (ATP), methane (CH4) by use of CTD system, showed significant anomalies in those areas. From positive vent flume results, we could conclude that these areas were or are experiencing very active volcanic activities. The acquired chimney and hydrothermal altered bed rock samples gave us confidence of the existence of massive hydrothermal deposit. Even though not to use visual exploration equipment such as ROV, DTSSS, etc., traditional marine geophysical investigation approach might be a truly cost-effective tool for exploring seafloor hydrothermal massive deposit.
Keywords
seafloor hydrothermal deposit; multi-beam; magnetic anomaly; vent flume;
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