四川黑水-台湾花莲断面岩石圈与软流圈结构

运用现代构造解析理论和方法,对四川黑水-台湾花莲人工地震测深剖面与天然地震面波层析成像进行系统分析基础上,结合地质学、地球化学以及其它地球物理学标志等多学科综合研究显示,高速块体或幔块构造的几何结构样式是控制该区岩石圈构造格局和岩石圈表层构造变形最基本条件之一,首次建立起该断面岩石圈与软流圈结构模型,划分出岩石圈四种几何结构样式:克拉通陆根状结构,造山带楔状结构、碎块状结构和藕节状结构,以及岩石圈四类构造演化类型:克拉通型岩石圈、增厚型岩石圈、减薄型岩石圈和大洋型岩石圈.在系统论述断面及邻区岩石圈结构类型特征基础上,探讨了该断面软流圈结构特征、岩石圈与软流圈相互作用及其大陆动力学基本型式.

Structures of lithosphere and asthenosphere in Heishi of Sichuan-Hualian of Taiwan profile

Using the theory and method of modern structural analysis, the paper analyses the artificial (seismic) sounding profiling and tomography of the natural seismic surface wave from Heishui of Sichuan to Hualian of Taiwan, and discovers that high-speed blocks varies in shape and differs in size in the lower lithosphere on the basis of the studies of the geological, geochemical, and geophysical signs. These blocks are termed mantle blocks. This shows that the tectonic pattern of the Heishui of Sichuan-Hualian of (Taiwan) lithosphere and the superficial deformation are basically controlled by the high-speed blocks or the mantle blocks. Based on the systematic studies of the high-speed blocks in the lithosphere, four geometric structural styles (craton-root-shaped, orogen-wedge-shaped, clastic-massive and slaty) are formulated for the first time, and four tectonic evolution types of the lithospheres (cratonic, thickening, thinning, and (oceanic)) are divided. According to the geometric models of the lithosphere from Heishui of Sichuan to Hualian Taiwan, the paper deduces the structural types of asthenosphere, the interaction of lithosphere and asthenosphere, and the continental dynamic types of lithosphere.