摘要
依据糜棱面理产状、剪切褶皱（鞘褶皱）形态、拉伸线理空间位志、构造岩及剪切变质作用等特征的对比研究，确定陇县深变质岩区存在两种不同类型的韧性剪切带，即韧性推覆剪切带和韧性平移剪切带。结合区域地质构造的研究，认为韧性推覆剪切带形成于加里东晚期，与这一时期碰撞造山作用有关，而韧性平移剪切带则是印支期造山带内右行走滑作用的结果。
Correlation and study of the characteristics of mylonitic-planar joint attitudes, shapesof shear fold (sheath folds), spacial distributions of tensile lineation, tectonic rocks andshearing metamorphism suggest that there are two different types of ductile-shear zones inthe intensely metamorphozed rock region, i. e., ductile - napped shear zone. and ductilestrike - slip shear zone. Regional geology and structures also indicate that the ductile -napped shear zone was formed in the late of the Caledonian age, which is related to contemporaneous collision orogeny. The ductile strike-slip shear zone was formed by right-strikeslipping of the Indosinian intra -orogeny.
出处
《陕西地质》
1996年第4期13-21,共9页
Geology of Shaanxi
关键词
韧性推覆剪切带
韧性平移剪切带
应变分析
深变质岩区
陇县
Ductile-napped shear zone
Ductile strike-slip shear zone
Stress analysis
Intensely metamorphozed rock region
Longxian
