摘要
漳州盆地与相邻地带的地质构造复杂,水热活动强烈,且伴随着小地震的频频发生.为厘定该盆地深部是否存在潜在的干热岩体,则必须对其壳、幔精细结构和介质物理属性进行探查、研究与探讨.基于漳州盆地壳幔速度结构的格局发现:(1)"灵霄—漳州—安溪"地带的深处存在一低速层,且在漳浦—长泰之间呈现出一"扁豆状"低速体;(2)该低速体北侧为一伸抵上地幔顶部、且向北倾的深大断裂带,若该"扁豆状"低速体为潜在的干热岩,则该深大断裂带可能为深部热液物质上涌与热源补给的通道.
The Zhangzhou basin and adjacent areas are complex in geological structure with strong hydrothermal activity and frequent small earthquakes.To clarify whether hot dry rock exists beneath this region,we must explore fine structures of the crust and mantle and the properties of their media.The pattern of velocity structures in the Zhangzhou basin suggests that(1)a low velocity zone exists in the crust of the Lingxiao-Zhangzhou-Anxi area,while a lens-shaped low velocity body is present between Zhangpu and Changtai.(2)North of this low-velocity body is a deep and large fault zone that dips to north,extending to the top of upper mantle.If this lensshaped low velocity body is potential underground hot dry rock,then this fault zone is probably a channel of upwelling hydrothermal materials and thermal source supply from deep curst and mantle.