Magmatic Activity Characteristics and Its Coupling Relationship with RegionalTectonics in the Eastern Depression of North Yellow Sea Basin, Eastern China
Wang Ren
Shi Wanzhong
Zhang Xianping
Tang Daqing
Chen Haoran
Xu Qinghai
Xu Zhuang
Abstract：In order to deepen the understanding of magmatic activity characteristics in North Yellow Sea basin, discuss the tectonic origin of such intensified magmatic activity in Early Cretaceous, and reveal the structural dynamic mechanism in eastern China, the magmatic activity characteristics and its coupling relationship with regional tectonics were well depicted in North Yellow Sea basin based on well data, high-precision 3D seismic data and magmatic rocks test data.On the space scale, intrusive and extrusive characteristics of magmatic rocks on the seismic profiles and the lateral distribution along the major faults of magmatic rocks were described specifically.On the time scale, four stages of magmatic activity were recognized including 108-115Ma and 134-145Ma which occurred in Early Cretaceous.When combined the magmatic activity with regional geological analysis, we believed that magmatic activity exceptionally fierce in the early period of Early Cretaceous.At that time, Izanagi plate oblique dived beneath the Eurasian plate along the NNW with high-speed and low angle.At the same time, the Pacific plate dived in SW.Under the plate shearing action, the Tanlu fault zone started to sinistral strike-slip which generated the sinistral stretching environment around North Yellow Sea basin.Therefore, the derived NW dextral and SN sinistral secondary conjugate fault systems inside the basin controlled the intrusion of magmatic diapir activity.After a comprehensive analysis, the coupling relationship between magmatic activity, fault evolution characteristics, and regional plate movement had been confirmed.
Keywords：eastern ChinaNorth Yellow Sea basinmagmatic activitytectonicscoupling relationship
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：14( 587-600 )