【摘要】：俯沖帶區(qū)域地震釋放的能量占全球地震活動釋放能量的90%(Lay,2005),而地震活動產(chǎn)生的地震和海嘯,對人口稠密地區(qū)存在災(zāi)難性的影響。因此,對俯沖帶區(qū)域的研究,成為地球科學研究的熱點。為了更好地理解俯沖帶的演化規(guī)律及其引發(fā)地震的原因,國際大洋鉆探計劃(IODP)在日本西南外海執(zhí)行多航次的南海海槽發(fā)震帶實驗,研究俯沖帶地區(qū)的巖石、沉積物和流體的基本特征(Margins Steering Committee,2004)。IODP316航次C0004和C0008站位位于俯沖帶區(qū)域增生楔八字形非序列逆沖斷層的淺部,其目標是為了探究俯沖帶不同構(gòu)造位置沉積物的差異,進而為南海海槽構(gòu)造和環(huán)境演化提供信息。 本文對南海海槽316航次C0004和C0008站位巖芯樣品進行了系統(tǒng)的環(huán)境磁學研究。研究結(jié)果顯示C0004,C0008站位沉積物巖芯中的磁性礦物主要為鐵硫化物(黃鐵礦,膠黃鐵礦,磁黃鐵礦)及粗粒的磁鐵礦,沉積物可能經(jīng)歷了后期的還原成巖作用。利用磁學參數(shù)識別了硫酸鹽-甲烷轉(zhuǎn)換界面深度：C0004鉆孔硫酸鹽-甲烷轉(zhuǎn)換界面頂界在,-2m CSF,底界在-20m CSF; C0008A鉆孔硫酸鹽-甲烷轉(zhuǎn)換過渡帶在3-15m CSF。對比發(fā)現(xiàn),鉆孔的磁學特征對增生楔的構(gòu)造演化有很好的響應(yīng),并且受流體影響,C0004鉆孔沉積物黃鐵礦礦化完全。
[Abstract]:The energy of the subduction zone seismic release is 90% of the energy released by the global seismic activity (Lay,2005), and the earthquake and tsunami produced by the seismic activity have a disastrous effect on the densely populated area. Therefore, the research on the subduction zone has become the focus of the earth science research. In order to better understand the evolution of the subduction zone and the cause of the earthquake, the International Ocean Drilling Program (IODP), in the south-west coast of Japan, carried out a multi-voyage in the South China Sea Trough to study the basic characteristics of rock, sediment and fluid in the subduction zone (Margins Steering Committee,2004). The IODP316 flight C0004 and C0008 are located in the shallow part of the subduction zone and the regional hyperplastic wedge-shaped non-sequence thrust fault, and the aim is to explore the difference of the sediment in different tectonic positions of the subduction zone and to provide the information for the structure and the environmental evolution of the South China Sea. In this paper, the environmental magnetism of the core samples of the C0004 and C0008 stations in the sea trough of the South China Sea is studied in this paper. The results show that the magnetic minerals in the core of the deposit of C0004 and C0008 are mainly iron sulfide (pyrite, pyrites, pyrrhotite) and coarse-grained magnetite, and the sediments may undergo the later-stage reduction and diagenesis. The depth of the sulfate-methane conversion interface is identified by using magnetic parameters: the top boundary of the C0004 borehole sulfate-methane conversion interface is at, -2m CSF, and the bottom boundary is -20m CSF; the C0008A drilling sulfate-methane conversion transition zone is between 3 and 15 m CS F. It is found that the magnetic character of the borehole has a good response to the structural evolution of the accretive wedge and is affected by the fluid.
【學位授予單位】：中國地質(zhì)大學（北京）
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：P738.3;P736.21

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