MAGNETOSTRATIGRAPHY OF MARINE-TERRIGENOUS FACIES DEPOSITS IN BOHAI BAY
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摘要: 渤海湾的海陆交互相沉积对研究海陆环境变化、新构造活动及华北平原的演化历史等均有重要意义,而建立可靠的年代地层框架是上述研究的前提。对取自渤海湾西岸天津市深度为203.57 m的BZ2钻孔进行了详细的磁性地层学研究,结果表明,钻孔岩心包含4个正极性段,分别可与标准极性柱中布容(Brunhes)、贾拉米洛(Jaramillo)、奥尔都维(Olduvai)和高斯(Gauss)正极性世对比;获得的3个负极性段则与松山(Matuyama)和凯纳(Kaena)事件对应,从而获得钻孔岩心底部年龄约为3.18 MaBP。磁性界限之间平均沉积速率的相对一致性,指示了渤海湾在晚上新世以来总体稳定的下沉趋势。Abstract: 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 BZ2 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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Keywords:
- marine-terrigenous facies /
- borehole /
- magnetostratigraphy /
- late Pliocene /
- North China Plain
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