攀枝花古地幔柱壳、幔结构与地球物理边界场特征

攀枝花古地幔柱的形成与演化对这一地域的大地构造格局、金属矿产的聚集和区域大陆动力学研究均有着极为重要的科学意义和应用价值.本文通过穿越攀枝花古地幔柱中心部位的四条人工源深部地震探测剖面和区域地球物理边界场响应研究提出：（1）攀枝花古地幔柱具有特异的壳、幔速度结构；（2）在其中心部位由结晶基底到壳、幔边界均为高速体，且结晶基底和Moho界面局部隆起、地壳内部存在厚达10余千米的低速层，且被数条深、大断裂切割；（3）重力场、磁力场的边界异常场响应组构了攀枝花古地幔柱的地表形态和中心部位的圈闭范围.

The crust-mantle structure and geophysical boundary field characteristics of Panzhihua ancient mantle plume "relics"

The formation and evolution of the Panzhihua ancient mantle plume have crucial scientific significance and application value for the geotectonic pattern, metal mineral accumulation and continental dynamics research in this region. By studying four in-depth seismic profiles of artificial sources crossing the central part of Panzhihua ancient mantle plume and local geophysical boundary field responses, we propose that:(1) Panzhihua ancient mantle plume has a specific crust-mantle velocity structure; (2) in the central part of the Panzhihua ancient mantle plume, the high-speed bodies are found from the crystalline basement to the crust-mantle boundary, and the crystalline basement and Moho interface uplift locally. There are low-velocity layers with a thickness of more than 10 kilometers in the crust, which are cut by several deep and broad faults; (3) the response of anomalous boundary fields of gravity and magnetic fields constitutes the surface morphology of Panzhihua ancient mantle plume and the trap range of its central part.