摘要
云南三江地区三叠纪以来以陆壳块体间挤压逆冲推覆剪切为主要变形机制。在逆冲推覆作用形成山脉过程中，地表热流主要受下述三种热贡献控制：（１）放射性元素衰变产生的热；（２）逆冲断片运动产生的摩擦热；（３）深部热流从一个推覆断片向另一个断片的传导。据此建立了该区复合叠加型岩石圈热结构模式。这种模式不仅表征了区内岩浆岩、火山岩和变质岩的分布规律，而且阐明了构造作用的统一的深部热背景。
Thrust nappe shearing and strike shearing between terrains have been the main deformational mechanism since Triassic(LateIndosinian stage)in Sanjiang Region of Yunnan. During the formation of a mountain chain by overthrusting of one thrust sheetonto another,the surface heat flow is mainly controlled by three following thermal contributions:(1)Preduction of heat byradioactive decay;(2)Heat generated by friction on the thrust plane;(3)The thermal relaxation of heat from deep Mantle byheat conduction from one sheet to another. Therefore,during orogenic proresses by terrains colliding,a model of superimposedthermal structure of the Lithoshere in SanJiang Region is set up.By the model not only the distributive pattern of magmatic,ig-neous and metamorphic rocks,but also unified deep thermal setting of tectonic movement can be explained.
出处
《地质与勘探》
CAS
CSCD
北大核心
1994年第4期12-20,共9页
Geology and Exploration
