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Typical basin-fill sequences and basin migration in Yanshan,North China——Response to Mesozoic tectonic transition

【摘要】:正Basin-fill sequences of Mesozoic typical basins in the Yanshan area,North China may be divided into four phases,reflecting lithosphere tectonic evolution from flexure(T_3),flexure with weak rifting(J_(1+2)),tectonic transition(J_3),and rifting(K).Except the first phase,the other three phases all start with lava and volcaniclastic rocks,and end with thick coarse clastic rocks and/or conglomerates,showing cyclic basin development rather than simple cyclic rift mechanism and disciplinary basin-stress change from extension to compression in each phase.Prototype basin analysis,based on basin-fill sequences,paleocurrent distribution and depositional systems,shows that single basin-strike and structural-line direction controlling basin development had evidently changed from east-west to northeast in Late Jurassic in the Yanshan area, although basin group still occurred in east-west zonal distribution.Till Early Cretaceous,main structural-line strike controlling basins just turned to northeast by north in the studied area.

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