摘要
利用地表大地热流观测资料、岩石生热率及热导率数据研究了三江和四川盆地 6个地区的岩石层平均温度结构及强度分布。结果表明 ,整个三江地区岩石层温度较高 ,而四川盆地温度较低 ;在岩石层强度分布上 ,四川盆地为高强度区 ,而三江地区则为低强度区 ;整个三江地区构成了一条青藏高原物质东流的低强度通道 ;由于四川盆地高强度块体的阻挡 ,青藏高原向东的物质流在此转向近南向 ,沿三江地区流逸 ;不同岩石层块体的强度差异可能是控制高原物质流动态势的重要力学背景之一。
The averaged lithospheric thermal and strength structure of six tectonic units in Sanjiang region and Sichuan Basin is investigated by using the surface heat flow data, rock heat generation rate and thermal conductivity. It is shown that the lithospheric temperature is high in Sanjiang region, while low in Sichuan Basin. As to the lithospheric strength, it is high in Sichuan Basin, while low in the Sanjiang region. The eastward mass flow of Tibetan Plateau turns to the near southern direction, and moves along Sanjiang region due to the resistance of high strength blocks of Sichuan Basin. The results suggest that the difference of lithospheric strength of various blocks is one of the important roles which control the mass flow pattern of the Tibetan Plateau.
出处
《地壳形变与地震》
CSCD
2001年第2期1-6,共6页
Crustal Deformation and Earthquake
基金
国家自然科学基金 (4 973 4 0 1 5和 4 9874 0 0 5 )项目
