利用大地热流估算松辽盆地岩石圈深度

Using Heat Flow to Estimate Lithosphere Depth of Songliao Basin,North China

利用大地热流进行大面积岩石圈深度计算 .在利用地震波速换算岩石生热率和收集岩石热导率的基础上 ,计算了北纬 39°～ 4 9° ,东经 112°～ 131°范围的岩石圈深度 .结果表明 ,区内岩石圈深度变化较大 ,呈现北深南浅 ,西深东浅的特点 ,东西过渡带位于大兴安岭重力梯度带上 ,而大庆附近地区岩石圈局部变化较为激烈 ,变幅达 70km .

Using heat flow to calculate lithosphere depth is noticeable for low cost and easy way.In the paper,heat flow was applied to estimate the lithosphere depth of Songliao basin,north part of China,latitude from about 39 degree to 49 degree,longitude from 112 degree to 131 degree based on converting seismic velocity (v_p) to rock radioactivity and collecting rock conductivity.The result shows that the depth variation is great with the feature of the deeper the North and the much shallow the South,the west part is much deeper than the east.The transition belt is located at Daxinganling gravity gradient belt.