摘要
研究华北地台东部边缘早元古代拉伸构造及与变质核杂岩的比较,提出了隆-滑构造模式。它一般发生在大规模收缩造山作用之前,由于区域拉伸作用,导致下地慢上隆,形成岩浆隆起或基底隆起,使上覆盖层发生重力滑脱。该模式由核部隆起、上部盖层和其间的拆离韧性剪切带组成。核部隆起一般由岩浆隆起(辽吉地区)或基底隆起(胶北地区)构成;上部盖层内发育有顺层滑脱构造系,由底部主滑脱面和内部次级滑脱面及其间的流褶层、片理化带构成。靠近核部隆起的盖层表现为正向滑脱,而滑脱前缘则表现为反向滑脱,具有滑覆特征。
According to a detailed study of Early Proterozoic extensional structures on the eastern margin of Northern China Platform and comparison with the metamorphic core complex, an uplift-bedding slide structural model has been put forward. The model generally occurs before large-scale contractive orogeny. Regional extension results in mantle uplifting, thus bringing about magma upwelling or basement uplift. Sequentially, the overlying cover begins to slide due to gravity. The model consists of the core uplift, cover and detachment ductile shear zone between the core and cover. The core uplift is often a magma uplift or basement uplift. In the cover, there occurs a bedding slide (detachment) structure system which includes the basal main slide plane (detachments) and inner secondary slide planes as well as rheid fold layers and foliated zones between the slide planes. The slide planes in the cover have the characteristics of normal sliding near the core and reverse sliding in the front. The reverse sliding is characterized by slide stacking.
出处
《地质论评》
CAS
CSCD
北大核心
1997年第6期569-576,共8页
Geological Review
基金
国家自然科学基金(编号49372133)
关键词
华北地台
早元古代
隆-滑构造
韧性剪切
拉伸
eastern margin of the North China Platform, Early Proterozoic, uplift-slide structure, bedding ductile shear, extension
