| 冲绳海槽中部热液活动区构造地球物理特征分析 |
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| 引用本文： | 栾锡武,翟世奎,干晓群.冲绳海槽中部热液活动区构造地球物理特征分析[J].沉积学报,2001,19(1):43-47. |
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| 作者姓名： | 栾锡武 翟世奎 干晓群 |
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| 作者单位： | 中国科学院海洋研究所 山东青岛 266071 |
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| 基金项目： | 国家自然科学基金重点项目 !(批准号 :497362 1 0 )，中国科学院院长基金资助 |
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| 摘 要： | 对冲绳海槽中部南奄西、伊平屋、伊士名三个现代海底热液活动区的地形、热流分布、地震、地磁场特征进行了初步研究。结果表明,海槽中部的热液活动区都集中于海槽的中央地堑中,或位于火山口的侧坡上,或位于地堑中山脊的侧坡上,热流值高而变化大,地震事件十分上频繁,地磁场曲线变化较大。这一系列特征说明现代海底热液活动区和目前的构造活动带吻合,热液活动和岩浆作用或浅成岩浆房密切相关。板块俯冲在海槽下诱生地幔物质上涌,上涌的地幔物质所携带的热量为热液活动提供了动力源,在海槽拉张过程中形成的断裂为热液流体提供了运移通道.
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| 关 键 词： | 冲绳海槽 热液活动区 构造地球物理特征 |
| 文章编号： | 1000-0550(2001)01-0043-05 |
| 收稿时间： | 2000-02-14 |
| 修稿时间： | 2000年2月14日 |
Tectonophysical Features of the Hydrothermal Fields in the Middle Okinawa Trough |
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| LUAN Xi-wu,ZHAI Shi-kui,GAN Xiao-qun.Tectonophysical Features of the Hydrothermal Fields in the Middle Okinawa Trough[J].Acta Sedimentologica Sinica,2001,19(1):43-47. |
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| Authors: | LUAN Xi-wu ZHAI Shi-kui GAN Xiao-qun |
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| Institution: | Institute of Oceanology,Chinese Academy of Sciences,Qingdao Shandong 266071 |
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| Abstract: | 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 to day.Hydrothermal activity as a window and clue of studying the origin and evolut ion 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,s eismicity and magnetic anomaly of three hydrothermal fields including southwest Amami hydrothermal field、Iheya deep hydrothermal field and Izena caldron hydroth ermal 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 hydroth ermal 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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| Keywords: | Okinawa Trough hydrothermal fields tectonophysical features |
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