松潘-甘孜滑脱型山链变形构造演化模式

本文从变形构造、变形式样、变形机制及相关的变形一变质关系研究人手,厘定了丹巴地区的构造层次。在纵向上将主造山期滑脱构造划分了三个变形构造域:上部变形构造域、中间变形构造域和下部变形构造域。提出了该造山带主造山期多层次滑脱构造二维空间的构造变形演化模式。

A MODEL FOR DEFORMATION STRUCTURE EVOLUTION OF SONGPAN-GARZE OROGENE

Large scale orogensis which is represented by the early bidirected contraction, uplifting and strike-slipping at the late orogensis accompanied by magmatism and metamorphism mainly started at the Late Indosinian. With the opening of Neo-thethys and intracontinental subduction, the Songpan-Garce orogen had been rebuilt by Neo-thethys tectonic movement. Multiple levels of large decollement structure developed in the orogen as a result of intensive north-south trending contraction at the major stage of orogensis. On the basis of the researches on the deformational structure, deformation patterns, deformation mechanism and the related metamorphism of Danba area, the structural levels has been defined. The decollment structures formed at the major orogensis can be divided into three regimes as the upper, middle and lower deformation regime. The model for the deformation structural evolution of multiple-levels decollment structures has been given out and the magnitude and mechanism of uplifting have been addressed as well.