辽吉古裂谷内带顺层构造片岩的变形构造与变形机制

DEFORMATION STRUCTURES AND DEFORMATION MECHANISM IN BEDDING-PARALLEL TECTONIC SCHIST IN THE INNER ZONE OF THE LIAOJI PALEAORIFT

本文从变形构造,尤其是变形显微构造研究入手,探讨了广泛发育于辽吉古裂谷内带的泥质构造片岩的形成与演化。对石榴石、石英和黑云母的变形亚结构及岩石变形构造分析揭示出,构造片岩的形成主要包含了伸展环境下出现的剪切作用、挤压作用以及扩散蠕变过程。同时还应用变形轨迹图展示了构造片岩的形成及形成后的改造过程。

The formation and evolution of the well-developed pelititic tectonic schist in the inner zone of the Liaoji paleaorift are discussed through the study on the deformation structures, with a particular attention to the microstructures. By analysing the deformational subtextures of garnet, quartz and biotite, and the deformational structures of the rocks, it is indicated that the development of tectonic schist zones involves shearing, compression and diffussional creep processes under the regional extentional condition. Meanwhile, it is also shown that the application of deformation path map to the formation and evolution of these tectonic schist zones.