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MAGNETOSTRATIGRAPHY OF MARINE-TERRIGENOUS FACIES DEPOSITS IN BOHAI BAY

YAO Zheng-quan~(1,2),GUO Zheng-tang~(1,3),CHEN Yu-kun~(4),XIAO Guo-qiao~(1,2),SHAO Yong-xin~(4),WANG Xu-long~(1,2),HAO Qing-zhen~(3),LU Yan-chou~(1,5)(1 State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi'an 710075,China;2 Graduate School of the Chinese Academy of Sciences,Beijing 100039,China;3 Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;4 Earthquake Administration of Tianjin Municipality,Tianjin 300201,China;5 Institute of Geology,China Earthquake Administration,Beijing 100029,China)  
Marine-terrigenous deposits in Bohai Bay is significant for studying marine-terrigenous environmental change,new tectonics,evolutive history of North China Plain and so on,while establishing reliable chronology framework is the base.Here,a detailed paleomagnetic investigation of BZ_(2) core(203.57 m) drilled from Tianjin,western Bohai Bay has been carried out.The results show that the core consists of four normal magnetozones which can be correlated to Brunhes,Jaramillo,Olduvai and Gauss,and three reverse magnetozones corresponding to Matuyama and Kaena.Hence,the core began deposition at about 3.18 MaBP.The consistency of sedimentation rate between polarity boundaries show steady subsidence in Bohai Bay since late Pliocene.And the results also have provided reliable chronology framework for studying stratum correlation and marine-terrigenous changes in western Bohai Bay.
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