Active Tectonics in the Central North China Block and the Cause of the Formation of the Fenwei Graben
详细信息
- 责任者：Wu Qi (Key Lab. of Submarine Geosciences and Exploration Techniques ; Ministry of Education ; Qingdao 266100 ; China) ; Xu Liqing
- 刊名：Earth Science Frontiers
- 出版年：2013
- 卷期：20(4)
- 关键词：活动构造 ; active tectonics ; 汾渭地堑 ; Fenwei Graben
- 页码：p.104-114
- 图表：illus., 2 tables, 50 refs.
- 分类号：0300
- issnNo：ISSN1005-2321
- isbnNo：CN11-3370/P
摘要
The study area is located in the center of the North China Craton which was affected by two global domains: the Paleo-Pacific and the Tethys tectonic domains.In the Cenozoic,the North China Craton was under destruction,and the Bohai Bay Basin and the Fenwei Graben developed.Until now,the activity of the North China Craton is still increasing and different trending faults and basins show different activities.The NW-trending and EW-trending strike-slipping faults are sinistral.The NE-trending faults are predominantly normal.Though the NNE-trending faults display normal,the slip components are gradually obvious.Therefore the NE-trending basins show activity different from that of the NNE-trending basins in the Fenwei Graben.In the Quaternary,the sedimentation rates of the NNE-trending grabens are larger than those of the NE-trending grabens,though there was no difference of the sedimentation rates when the basins were formed.The Qinghai-Tibet Plateau and the uplifting mountains in the North China Block happened in the same period.This paper proposes that the active tectonics in the center of the North China Block since the Miocene was mainly impacted by a far-field extrusion resulting from the collision of the Indian Plate to the Eurasian Plate.The extrusion caused the NE-trending dextral shearing and the NWW-trending sinistral shearing that played a role in the activities of the center of the North China Block.The join effect of those shearing resulted in the destruction in the north and south parts of the North China Block in the Miocene.The acceleration of the Qinghai-Tibet Plateau uplifting caused two shearing events having different amplitudes,the resultant force also switched from the NW-trending extension to the NNW-trending extension,and transferred its impact to the east and north parts of the study area,resulting in the development of grabens,the variation of activity of faults with different strikes,and the migration of the subsidence centers and depocenter since the Pliocene.
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