胶东半岛温泉的地热特征

Geothermal characteristics of warm spring in Jiaodong Peninsula

胶东半岛位于欧亚板块与太平洋板块边缘内侧 ,是地壳长期稳定缓慢隆起地段 ,区内地质构造发育 ,大部分温泉出露在背斜核部 ,NE、NNE向与 NW、NNW向断裂交汇处。地热系统属中低温深循环对流型 ,略为偏高的大地热流是其主要热源 ,地表水是地下热水的补给水源 ,地下水通过发育在花岗岩和变质岩中的断层或断裂破碎带 ,下渗和深循环对流 ,在径流过程中不断吸取围岩热量成为热水 ,沿断裂上升过程中 ,与地下浅部裂隙水混合而成为化学成分各异 ,温度高低不等的温泉水。

Located at the inside edge of Eurasia and Pacific plates, Jiaodong Peninsula is a relatively steadily upwarping district. Most of the warm springs are distributed in the cores of anticlines, at the intersections of fractures in the NE, NNE and NW, NNW directions. Being of the low\|medium temperature deep\|circulation convective type, the geothermal system was heated by normal to relatively high heat flow. Surface water is the supply source of hot ground\|water. The groundwater runs through faults of fracture zones developed in granite and metamorphite, infiltrates and deeply circulates, absorbs continuously the heat from the country rocks in the runoff process, and then turns into hot water. The hot water goes up along fractures, mixes together with the fissure water in upper strata, and becomes warm spring water of different chemical compositions and temperatures.