DISTRIBUTION AND ORIGIN TYPES OF THE FOLDS IN THE NORTH YELLOW SEA BASIN
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摘要: 北黄海盆地为叠置在华北地台上的中新生代断陷盆地,在地史上经受了多期区域构造运动的改造,地层变形强烈,褶皱构造相当发育,分为伸展型、压缩型、重力型和热力型4大成因类型。其中,与张性正断层相关的伸展型褶皱分布范围最广,可进一步划分为牵引褶皱、逆牵引褶皱、滚动褶皱、翘倾褶皱、补偿性挤压背斜和断层-位移褶皱;形成于区域挤压应力场的压缩型褶皱包括非反转挤压褶皱和反转褶皱,在东部和中部坳陷表现明显;重力型褶皱以发育于古潜山之上的披覆背斜比较常见;由岩浆活动引起的热力型褶皱不甚发育,目前仅见于东部坳陷。Abstract: North Yellow Sea basin is a Mesozoic/Cenozoic fault basin superposing on North China platform, which has distorted stratum and well-developed fold structures due to the reconstruction of several structure movements. The folds in the North Yellow Sea basin are mainly classified into four origin types, namely extensional folds, compressional folds, gravitational force folds and thermogene folds. The extensional folds related to normal faults are distributed most widely, which can be further divided into drag folds, reverse-drag folds, rolled folds, compensation squeezed anticlines and fault-displacement folds;the compressional folds including non-reverse squeezed folds and reverse folds are caused by territorial extrusion stress and spread both in the eastern sag and the mid-sag apparently. As a kind of gravitational force folds, buried-hill drape anticlines are quite easily observed in the North Yellow Sea basin, while the thermogene folds only appear in the eastern sag owing to inactive magmation.
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Keywords:
- fault basin /
- fold /
- origin type /
- the North Yellow Sea
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