山西断陷带地热分布的某些特征  

Some Characteristics of the Geothermal Distribution in Shanxi Rift Zone

作　　者：李清林[1] 

机构地区：[1]国家地震局地球物理勘探大队

出　　处：《山西地震》1996年第1期26-30,共5页Earthquake Research in Shanxi

摘　　要：利用山西断陷带的大地热流、地温梯度和温泉分布的资料，研究了地热分布与重力场、地壳深部构造和地震分布的关系。认为，区域性重力负异常多反映的是沉积盆地或凹陷；而在温泉附近，由于地壳深部高密度的熔融物质沿断裂上涌而形成重力正异常；在同一深度上，地壳和岩石圈薄的断陷盆地内部，其热流和温度都为高值；指出山西断陷带内的构造活动性、壳幔突变带、重磁力等值线密集带、大地热流和地温梯度高值区以及温泉密集分布带与地震活动之间都有着内在的联系。The relation of the geothermal distribution to the gravity field, the infracrustal structure and the earthquake distribution have been studied using the data of the earth geothermal flow, the geothermal gradient and the thermal spring distribution in Shanxi rift zone. The paper suggests that the regional negative gravity anomaly reflected mainly the sedimentary basin or the depression; but around the thermal spring, the normal gravity anomaly formed by the upwelling of the high-density molten substance along the fracture; in the rift basin of the thin crust and lithosphere, the thermal flow and the temperature were high value. It is pointed out that the tectonic activity, the crustmentle catastrophic belt, the closed zone of the gravity-magnetic contour, the high value area of the geothermal flow and the geothermal gradient and the closed distribution area of the thermal springs in Shanxi rift zone are related to the seismicity.

关 键 词：地热流 地温梯度 重力场 深部构造 断陷带 

分 类 号：P314.2[天文地球—固体地球物理学]