【摘要】 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。更多还原

【Abstract】 Slow and ultraslow spreading ridges are the key areas for studying interplay among magmatism,tectonics,and hy-drothermal circulation comparing to the fast spreading ridges.Their complicated three-dimensional(3D) seismic structures are the basis of finding their tectonic dynamic mechanism.The research on the 3D seismic structures is reviewed in terms of slow spreading ridges in deep oceans,including its developing international research trend.The new experiments have detected a magma chamber or a melt body at a slow spreading ridge,same as at a fast spreading ridge.The 3D seismic survey for the first time was carried out on the southwest Indian Ocean Ridge from January to March in 2010.The key research aspects are then put forward based on these seismic experiment data.Its preliminary disposing result of the seismic data indicates that the high quality of the seismic data is the strong foundation of the 3D tomography.It is promising to make breakthrough in mechanism on ultraslow spreading ridges.The research will surely promote the Chinese status in the field of international ocean ridges.更多还原