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叠加于大青山晚侏罗世大型推覆体之上的呼和浩特变质核杂岩具有与经典变质核杂岩相似的几何形态和构造组成。核杂岩表现为多重拆离,南翼主拆离断层系控制了山前坡地地貌,北翼拆离系发生褶皱并呈分叉状。糜棱状岩带中的线理、面理和拆离断层面及其擦痕等构造要素产状协调一致,宏观同向伸展褶劈理(C’)产状与拆离断层一致,少数已扩展为断层;显微C’具有与宏观C’相似的特点,为同向伸展褶劈理扩展为低角断层提供了显微尺度依据。运动学标志,如不对称褶皱、不对称布丁、不对称眼球、S-C组构、石英条带斜交面理以及C’等,指示核杂岩拆离系发生了褶皱并且具有相同的上盘向南东的剪切运动。
The Hohhot metamorphic core complex superimposed on the Late Jurassic nappe in Daqingshan has the similar geometry and tectonic composition as the classical metamorphic core complex. The core complexes are characterized by multiple detachment. The main detachment fault in the south wing controls the topography of the hill slope and folds in the north wing detachment system are bifurcated. The lineal, facies, and detachment faults in the mylonitic belt are consistent with the occurrences of structural elements such as scratches. The occurrence of macro-fold extensional fold cleavage (C ’) is consistent with that of the detachment fault, The microscopic C ’has the same features as the macro C’, and provides a microscopic basis for the extensional fold cleavage to expand into low-angle faults. Kinematic signs, such as asymmetric fold, asymmetric pudding, asymmetric eyeballs, SC texture, oblique band of quartz bands and C ’, indicate that the core complex detachment has been folded and has the same upper disc orientation South East shear movement.