皖西地区岩石热导率及地表热流特征

Rock Thermal Conductivity and Surface Heat Flux Characteristics in West Anhui

通过已有资料共收集10组皖西地区地表热流数据,表明区内岩石热导率与地表热流平均值分别为2.65W/mK、75.04mW/m^(2),其中热导率与全球大陆岩石平均值相似,地表热流略高于大陆热流平均值。计算得出区内花岗岩生热率平均值为4.63μW/m^(3)。根据地表热流值特点,可分为北段、中段、南段三个热流区域。自北向南,地表热流值越来越低,反映了不同区域在岩石组成、地温梯度、地壳厚度、构造活动和岩石圈热结构上的差别。

A total of 10 sets of surface heat flow data for the western Anhui area are collected from the available data,indicating that the average thermal conductivity of the rock in the area and the average surface heat flux were 2.65W/mK and 75.04mW/m2,respectively.The thermal conductivity is similar to the average value of the global continental rock.The surface heat flux is slightly higher than the average value of continental heat flux.According to the surface heat flow value,the western Anhui area may be divided into three heat flow areas:north,middle and south.From north to south,the surface heat flow value is getting lower and lower,reflecting the differences in rock composition,geothermal gradient,crustal thickness,tectonic activity and lithospheric thermal structure in different regions.