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慢速与超慢速扩张洋脊是研究岩浆活动、构造运动、热液循环等相互作用的最佳场所;其复杂的三维空间的地震结构是构建构造动力学机制的基础。文章首先结合国际深海研究发展趋势,回顾了慢速扩张洋脊的三维地震结构研究进展,发现慢速扩张洋中脊与快速洋脊相似,也存在岩浆房或熔融体;然后,重点结合我国2010年1—3月首次在西南印度洋洋中脊开展的三维地震探测实验,提出了今后超慢速洋中脊的重要研究方向;此次地震数据初步处理结果表明,数据质量良好,为下一步三维层析成像研究打下坚实基础;相信此次研究将在超慢速扩张洋脊的形成演化机制上取得突破性进展,提升我国在国际大洋中脊研究中的地位。
The slow and ultra-slow expansion ridges are the best place to study the interaction of magmatic activity, tectonic movement, hydrothermal cycle and so on. The complex three-dimensional seismic structure is the basis for constructing tectonic dynamics. The article firstly reviews the research progress of the 3D seismic structure of the slowly expanding ridges by combining with the international development of the deep ocean research. It is found that the slowly expanding mid-ocean ridge is similar to the fast ridges and also exists in the magma chamber or melt. The first 3D seismic exploration experiment carried out in the mid-ocean ridge of Southwest Indian Ocean from January to March in the year of January-March proposed the important research direction of the ultra-slow mid-ocean ridge in the future. The preliminary seismic data processing results show that the data quality is good, And lay a solid foundation for the study of tomography. It is believed that this study will make breakthrough progress in the mechanism of the formation and evolution of the ultra-slow expansion ocean ridge and enhance our country’s status in the study of the mid-ocean ridge.