The Dabie-Sulu region, located in the east part of the central orogenic belt of China, has the largest ultrahigh pressure metamorphic (UHPM) zone in the world. Based mainly on geophysical data newly obtained in the region, this paper shows the sophistication of the evolution and dynamics of the Dabie-Sulu UHPM belt. The subduction of the Dabie-Sulu terranes after collision between the Sino-Korean and Yangtze cratons induced the ultrahigh pressure metamorphism. A local extension occurred in Dabie-Sulu region after the subduction, yielding good conditions for exhumation of the UHPM rocks. The local extension was the result of Yangtze rotation that was generated by the oblique impact between the two cratons. The Yangtze rotation might also provided a pair of shear forces on bottom of the lithosphere to make a breakoff event that is essential to the exhumation of the UHPM terranes. Owing to continuing convergence between the two cratons after the exhumation of Dabie-Sulu UHPM terranes, Yangtze craton proceeded to subduct beneath the Dabie-Sulu terranes and the Sino-Korean craton. This intracontinental subduction carried tremendous mass of crustal materials into the upper mantle, causing later partial melting, mantle doming and rifting. Based on above-mentioned analysis, the previous models for evolution of the Dabie-Sulu terranes are elaborated.

利用大陆科学钻探取得的岩心岩性、构造编录和波速、中子密度测井资料，可以比较准确地标定大陆科学钻探主孔两侧三维地震发现的反射体。二维地震剖面上的反射体可能与二维测线方向有关，三维地震提供了与方向无关的反射体信号，为结晶岩区地壳反射波的标定提供了更加准确可信的基础数据。 只有在建立准确的波速模型，由测井资料合成的地震道与三维地震剖面之间达到完美拟合之后，反射体标定才有意义。地震剖面、测井和岩心资料的柱状对比图由于未考虑非线性时深转换和钻孔的弯曲，只能供初步分析用; 反射体的详细标定还要考虑到时深转换的非线性及钻孔的弯曲, 逐一制作标定分解图。引起结晶岩中反射体的机制是多方面的，文中逐一分析了过主孔的10个主要地震反射体的特点及成因，总结了结晶岩地区反射体分为三大类：(I)与韧性剪切作用有关的反射体; (II)与侵入岩或正变质岩岩体有关的反射体；(III)与围岩岩性构造不均匀性有关的反射体等。

由于大别山在中生代经受了造山期后的混合岩化、高温变质和强烈的构造运动，使岩石中有关的岩石学信息要么被剥蚀拆离，要么被混融改造，单靠岩石学或地质学的研究难以解决碰撞造山与超高压变质岩石形成折返过程的许多问题。于是，地球物理研究及深部地壳调查的信息就显得更为重要。上世纪末在大别山东段进行的综合地球物理调查, 取得的资料不仅提供了较精细的地壳结构信息, 而且不同方法取得的资料有很好的相关性。根据这些资料作综合研究可以编制出较为可靠的地壳构造剖面图。大别造山带的地壳可分为北淮阳、北大别、南大别与宿松四个构造单元。其中宿松高压变质带的中下地壳为扬子俯冲地壳，而北淮阳下方的中下地壳可能为中朝克拉通的地壳。南、北大别的中下地壳结构具有明显差别，反映了它们曾经有过不同的演化轨迹，不应把它们合并为同一个构造单元。现今大别造山带的结构主要反映了早—中侏罗世扬子克拉通的向北陆-陆俯冲及同期大别造山带的挤压变形，和晚侏罗世以来以北大别为中心的地壳伸展和上隆揭顶。推测在三叠纪南北碰撞时晓天—磨子潭断裂带可能处于缝合带的中心位置，它不象是俯冲前沿的逆断层。这种缝合带形状不很规则, 沿走向宽度也有较大变化, 可横跨北大别与北淮阳的邻近区带。

Recent 24 s deep seismic reflection records revealed five flat reflectors in the lithospheric mantle in Eastern China. With increasing depth, they are named M1 to M5 and can be seen on both field single-shot and stacked records. Reflector M1 corresponds to the Moho discontinuity, whereas M5 may be the reflection from the bottom of the current lithosphere, which is about 78 km deep according to geothermal measurements. The other three reflectors seem peculiar and might result from interactions between the lithosphere and deeper mantle. Based on lithological and geochemical data, it is suggested that the lithosphere has been thinned from about 150 km to about 60 km in the Late Mesozoic, and then has been thickened to about 78 km during the Cenozoic. The thinning process produced a granulite layer in the old lower crust caused by magmatic underplating, whereas an eclogite layer formed beneath owing to the subduction of the Paleo-Tethys and Yangtze Craton during the Permian and Early Mesozoic. Reflector M2 at about 12 s two-way traveltime (TWT) might result from the Paleozoic Moho, which represents the boundary between the previous granulite and eclogite facies. Reflector M3 at about 14 s might correspond to the bottom of the eclogite layer, beneath which the old lithospheric mantle remained. The old and the newly developed mantle may have different compositions, resulting in reflector M4. The multi-layered mantle reflectors demonstrate a mantle structure that possibly correlates with the lithospheric thinning process that occurred in Eastern China during the Late Mesozoic. The discovery of multi-layered mantle reflectors in the studied areas indicates a high heterogeneity of the upper mantle. Reflection seismology with improved technology, together with velocity and resistivity imaging and rock-physics measurements, can provide more details of the heterogeneity and related dynamic processes that occurred in the lithospheric mantle.