摘要
角闪石成分环带记录的P-T-t轨迹显示本区早期至中期变质阶段具有等压升温、主期至峰期接近等温升压、晚期快速减压降温的特点。与之同时的变形石英反映的各个变质阶段的超微构造,以及本区的褶皱构造,说明变质作用不同时期,变肜的强弱和变形机制是不同的,不同时期的滑移系和影响滑移的水致弱化行为的强弱也是不同的。
The P-T-t trajectory recorded by zonal composition of amphibole shows that there was a rising temperature and a equa pressure from early to middle metamorphic stages, a constant temperature and an increasing pressure from main to climax stages, and a rapidly reducing P and T at the late motamorphic stage. Ultramicro-structure of simultaneously deformed quartzat different metamorphic stages and fold structure in this area indicate that the intensity and mechanism of deformation are different at different metamorphic stages, the slip system of deformed quartz and the water-weakening effect influencing the slip of. quartz are also different at different metamorphic stages.
出处
《地质科学》
CAS
CSCD
北大核心
1992年第4期325-332,共8页
Chinese Journal of Geology(Scientia Geologica Sinica)
关键词
剪切带
韧性
变质作用
石英
蠕变
Malanyu Area, East Heoet, P-T-t trajectory, ultramicro-structure, Quartz. deformation mechanism
