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Tectonophysical Features of the Hydrothermal Fields in the Middle Okinawa Trough

LUAN Xi wu ZHAI Shi kui GAN Xiao qun (Institute of Oceanology,Chinese Academy of Sciences,Qingdao Shandong 266071)  
Hydrothermal activity is widely occurring along the active plate boundaries and intraplate volcanic centers which is exchanging heat and material between the lithosphere and the oceans.Okinawa Trough is an important part of Ryuky T A ba system which is in the collision and subduction zone between a oceanic block and continental block and is reported to be in the early stage of back arc spreading with a rift structure and an embryonic marginal basin,its origin and evolution may be one of the most interseting problems in geophysics and geology today.Hydrothermal activity as a window and clue of studying the origin and evolution of Okinawa Trough has been explored through out the Trough by scientists all over the worlds.Several hydrothermal fields have been found in the middle part of Okinawa Trough.Tectonophysical features of topography,heatflow distribution,seismicity and magnetic anomaly of three hydrothermal fields including southwest Amami hydrothermal field、Iheya deep hydrothermal field and Izena caldron hydrothermal field in the middle Okinawa Trough were studied.The results show that all the hydrothermal fields distribute in the central graben and locate at the slope of caldera or of central ridge with high and vary heatflow distribution,active seismic activities and fluctuating magnetic anomaly.It is found that the hydrothermal fields have close relationship with tectonic zoon.In the area of Ryukyu T A Ba system,the upwelling of mantal materials beneath the trough due to the subduction of Pacific Plate provides heat energy for the hydrothermal activity.The faults formation in the process of trough expending provides space for the hydrothermal activity.
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