南华北盆地群岩石圈热-流变结构  

Thermo-Rheological Structure of the Lithosphere in the South Huabei Basins

作　　者：张鹏[1] 王良书[1] 刘绍文[2] 李成[1] 丁增勇[1] 

机构地区：[1]南京大学地球科学系,南京210093 [2]南京大学地理与海洋科学学院,南京210093

出　　处：《高校地质学报》2006年第4期530-536,共7页Geological Journal of China Universities

基　　金：中石化项目<南华北盆地群的油气选区评价>资助

摘　　要：结合南华北盆地群现代地温场资料和深部地震测深资料及岩石热物性参数，对南华北盆地群的热结构进行了研究。结果表明，南华北盆地群平均热流值为53．7mW／m^2，地幔热流为30～34mW／m^2，莫霍面温度为500～550％，热岩石圈厚度为110～130km。在此基础上，进行了岩石圈流变模拟，探讨了研究区的岩石圈流变特征及其地球动力学意义。南华北盆地群岩石圈强度为（7．6～23．3）×10^12N／m，具有显著的“三明治”结构。上地壳表现为脆性变形，中、下地壳为韧性的流动变形。这一分层变形机制决定了南华北盆地群的成盆演化动力学过程。Based on the data of geo-temperature and rock thermophysical parameters and geophysical data collected from the South Huabei basins, the thermal structure of this region is analyzed. The results show that the average heat flow value of the South Huabei basins is 53.7 mW/m^2 , the values of mantle heat flow vary from 30 mW/m^2 to 34 mW/m^2, the temperatures of Moho vary from 500℃ to 550℃, and the thicknesses of thermal lithosphere are between 110 km and 130 km . Furthermore, integrated with the lithospheric rheological modeling, the rheological features of the lithosphere and its geodynamic signification in study area are also discussed. The lithosphere strength of the South Huabei basin is about （7.6 ～23.3 ） × 10^12 N/m . The lithosphere beneath the South Huabei basins has a obvious sandwich-like structure： The upper crust is in the brittle field; The middle crust and ,the lower crust is in the ductile field. This kind of stratified deformation mechanism is the controlling factor for the geodynamic process of the basins formation and evolution.

关 键 词：南华北盆地群 热-流变结构 地球动力学 

分 类 号：P541[天文地球—构造地质学]