河北省实测地表热流值及特征

Surface Heat Flow Values and Characteristics,Hebei

综合已有资料,共收集49个河北省大地热流数据。全省实测热流平均值为60.77 mW/m^(2),略低于热流大陆平均值。根据地理位置可分为:冀北为41.85 mW/m^(2),冀东为62.45 mW/m^(2),冀中为78.77 mW/m^(2),渤海为66.71 mW/m^(2)。从总体展布看,地热异常主要分布在华北断裂区并向外围逐渐降低,地热区与区域构造活动密切相关,多具有隆起与坳陷相间的构造格局。岩石组成地壳厚度、构造活动和岩石圈热结构上的差别,可能是造成不同区域大地热流值不同的原因。

Based on the available data,49 geothermal heat flow data of Hebei Province were collected.The average heat flux measured in the whole province is 60.77 mw/m^(2),which is slightly lower than the continental average value of heat flow.According to the geographical location,it can be divided into:It is 41.85 mW/m^(2)in the north of Hebei,62.45 mW/m^(2)in the east of Jidong,78.77 mW/m^(2)in the middle of Hebei,and 66.71 mW/m^(2)in the Bohai Sea.From the overall distribution,the geothermal anomalies are mainly distributed in the North China fault depression area,which gradually decreases to the periphery.The geothermal area is closely related to regional tectonic activities and mostly has the structural pattern of alternating uplift and depression.Differences in rock compositio,crustal thickness,tectonic activity and lithospheric thermal structure may be the reasons for the different geothermal flow values in different regions.