浙皖地区地壳-上地幔结构和华南与扬子块体边界

基于屯溪－温州剖面宽角反射地震资料，拟合反演了地壳浅层和深部结构，并利用非纵剖面记录构制了上幔顶部结构图象。结果表明，江绍断裂带是本区最明显的构造分界，其西北一侧的扬子块体和东南侧的华南块体地壳和上地幔顶部结构以及地球物理特征明显不同。金（华）衢（州）盆地下方地幔上隆，上地幔岩石层中有低速体，可能是一个复杂的岩浆房构造。地幔岩石层呈现出由ＳＥ至ＮＷ向仰冲的叠瓦式片状构造，提示该区明显受水剂压应力控制。

Crust-Mantle Structure of Zhejiang-Anhui Region and the Boundary between Yangzi Block and Huanan Block

Based on the wide-angle reflective seismic data from Tunxi(Huangshan)-Wenzhou profile laid at the Zhejiang-Anhui region, the crust-mantle structure and seismic velocity distribution were researched. A structure pattern of upmost mantle was constructed with the seismic data from a fan profile. It is shown that Jiangshan-Shaoxing fault is the most important tectonic belt in the considered region. Side NW and side SE of the fault belt is respectively Yangzi Block and Huanan block, and that crust-mantle structure and geophysical field characters of them are apparently difference. The facts that upper mantle under the Jinhua-Quzhou besin uplifts clearly and there is some low-velocity zones in upper mantle suggest perhaps existence of magma chambers. Some thrust faults in the upper crust and overlapping structure of upmost mantle indicate that the region is controlled by a pressed stress field.