摘要
在南天山中段,上志留统阿尔皮什麦布拉克组经历了两期变质变形作用。下泥益统彩华沟组的变质变形特点及变质期与阿尔皮什麦布拉克组的蜕变质作用时期完全一致。这两套地层的走向有30°～40°的交角,其间有出露长达14Km的底砾岩和古风化壳,构成了代表加里东晚期构造运动的不整合面。
The authors find out an unconformity at middle sector of Tianshan mountain, which represents late Caledonian tectonic movement. This unconformity consists of basalconglomerates and residum, which is 14 km in length. Stratum underlying the unconformity is Arpishimaibulak Formation of upper Silurian, stratum overlying the unconformity is the Caihuagou Formation of lower Devonian. The differences between strikes of these strata is 30°~40°. Arpishimaibulak Rormation suffered two periods of metamorphism . Moreover , there are a large number of granites of late Caledonian age within this region. The research demonstrates that late Caledonian tectonic movement swept across southern and central sectiond of Tianshan mountain, and continued from last phase of late Silurian to initial stage of early Devonian.
关键词
变质变形
构造运动
加里东期
Metamorphism and deformation, Unconformity, Magmatic activity, Tectonic movement
