摘要
在大地热流密度分布的基础上，研究了塔里木盆地中库尔勒－若羌和阿克苏－叶城两条剖面岩石层热结构特征．由岩石层Ｐ波速度分布转换成生热率剖面，用二维数值模型获得了岩石层热结构和热状态特征．结果表明，塔里木盆地壳幔边界温度的高低与其埋深密切相关．居里等温面深度大，地幔热流密度较低．岩石层厚度变化与其新生代期间挠曲过程密切相关．在岩石层温度分布基础上，确定了深部脆－韧性过渡带深度和岩石层屈服强度，表明塔里木盆地岩石层相对较冷，且具有刚性的地球动力学特征．
Based on the distribution of terrestrial heat flow,in two profiles across Tarim Basin,Korla-Ruoqiang and Aksu-Yechng,thermal structure and thermal state features of the lithosphere are simulated by solving numerically the 2-D heat transfer equation.Heat generation distribution in the lithosphere is obtained from the conversion of P-wave velocity distributions.Significant results include:Temperature at the Crust-mantle boundary are closely related to depth.The Curie isotherm is deep,and heat flow density from the mantle is low.The distribution of the lithosphere thinckness is resulted from its flexure during Cenozoic.The brittle-ductile transition zone and yield strength of the lithosphere are determined interms of temperature distribution and rheological parameters of granite and olivine.The depths to the brittle-ductile transition zone under the basin are large and the lithosphere strength are high.These results imply that the lithosphere beneath Tarim Basin is cold and strong,compared to surrounding regions.
出处
《地球物理学报》
SCIE
EI
CSCD
北大核心
1996年第6期794-803,共10页
Chinese Journal of Geophysics
基金
国家"八五"科技攻关
关键词
塔里木盆地
岩石层
热结构
流变学
Tarim Basin,Lithosphere,Thermal structure,Rheology,Brittleductile transition zone.
