汾渭地堑地裂缝的控热现象及其机制分析

摘要：汾渭地堑断陷盆地内有些地裂缝具有明显的地热异常显示，地裂缝成为地温异常区和F^-、Na^ 、Sr^2 、CI^-、He、H2、Rn等化学成分的富集带。热源分析结果表明，这种现象与区内活跃的地热活动有关，深部热流上涌过程中的强物理作用对于地裂缝的控热作用产生了重要影响。地裂缝的控热作用对于巨厚第四系沉积的汾渭断陷盆地浅埋型热田的形成具有重要意义，是汾渭地堑地热资源勘查和远景预测中应予以重视的控热构造。

Analysis of Geothermal-Controlling Phenomenon and the Mechanism of Ground Fissure in Fenhe-Weihe Down-Faulted Basin Belt

A number of ground fissure shows anomaly of both geophysical field and geochemical field in Fenhe-Weihe down-faulted basin belt,the characteristics indicates remarkableness in geotemperature and content of some chemical composition on the ground fissure, such as F-,Na ,Sr2 ,CI-,He,H2,Rn, etc. , and the results from heat source analysis indicates that the anomaly is related with the regional active geothermal activity. This kind of ground fissure, which is called as geothermal-controlling structure in this paper, play an important part in formation of shallow-buried geothermal field in the region as a conduit of thermal water upwelling. The geothermal-controlling phenomenon of the ground fissure is important to both investigation and perspective predication of hallow-buried geothermal resources on the down-faulted basin in where great thickness of Quaternary system is deposited. This paper discusses the genetical mechanism of the ground fissure, and indicates that hydrothermo-physical processes of heat flow upwelling exert a great influence upon that.