中国岩石圈三维结构专项研究主要进展和成果

Main advances and achievements in the special-subject study of the 3D lithospheric structure of China

“中国岩石圈三维结构”专项研究取得诸多新发现和新成果:建成中国第一个“岩石圈三维结构数据库”;建立了中国岩石圈结构模型;深化了对中国东部岩石圈、软流圈性状、结构的认识,证明岩石圈与软流圈之间存在呈“层块结构”的过渡带,在东亚至西太平洋地区70～250km深度发现一巨型低速异常带;揭示中国东部岩石圈呈现明显的“上老下新”的年龄结构;初步建立了中国大陆岩石圈岩石学结构模型,把中国大陆及毗邻海域岩石圈划分为5种类型;提出中国岩石圈构造单元划分方案,把中国大陆及毗邻海域划分为2个岩石圈构造域和6个岩石圈块体;证实青藏高原存在巨型南北向构造;在地质上获得一些新发现和新认识。

Many new findings and achievements have been obtained in the special-subject study of the ＂3D lithospheric structure of China＂. They are as follows： China＇s first ＂3D lithospheric structure database＂ has been established; China＇s hthospheric structure mod- el has been constructed; the knowledge of the behaviors and structures of the hthosphere and asthenosphere below eastern China have been deepened, it has been proved that there exists a transition zone with the ＂layer and block＂ structure between the lithosphere and asthenosphere, and a giant low-velocity anomaly belt has been found at 70-250 km depth from East Asia to the western Pacific region; an apparent age structure of being ＂older in the upper part and younger in the lower part＂ has been revealed in the lithosphere below eastern China; a petrological structure model of the lithosphere of continental China has been constructed, in which five types of hthosphere below continental China and its adjacent sea areas are distinguished; a classification scheme of lithospheric tectonic units of China is proposed, in which continental China and its adjacent areas are divided into two lithospheric domains and six lithospheric blocks; the existence of a gigantic latitudinal structure on the Qinghai-Tibet Plateau has been verified; and some new findings and knowledge have been obtained in the geological context.