中文摘要：

将青藏高原及周边区域地壳分为脆性层和韧性层,利用稳态热传导方程估算地壳内部温度场,并根据Crust2.0地球模型,利用破裂强度和蠕变强度相等确定了脆性-韧性转换面。结果表明：青藏高原及周边区域脆性-韧性转换面一般位于中地壳,深度分布为20～35km,地壳较厚的区域转换面也较深;转换面黏滞系数在1019～1022Pas之间,温度达450～600℃。

英文摘要：

The crust of the Tibetan plateau and its adjacent area is divided into two layers：the elastic brittle layer and the viscoelastic ductile layer,and then the interior temperature field of the crust by steady heat conductive equation is evaluated.Further,under the condition that fracture intensity is equal to creeping intensity,brittle-ductile transition plane is obtained by use of Crust2.0 earth model.The results show that brittle-ductile transition plane locates in middle crust about 20-35 km depth generally.The thicker the crust is,the deeper the transition floor is.Effective viscosity of transition plane located in Tibetan plateau is between 1019-1022 Pas,temperature field is between 450-600℃.