莱州湾南岸HLL01孔磁性地层定年

发布时间：2018-03-12 20:51

本文选题：莱州湾　切入点：磁性地层学　出处：《地质通报》2016年10期 　论文类型：期刊论文

【摘要】：亚洲大陆边缘海在区域能量与物质交换及气候与环境演化中扮演了关键的角色,而磁性地层学方法是建立年代框架的有效手段。过去对于渤海地区的长钻孔研究主要集中在渤海湾及其北岸,莱州湾地区尚未有较长的公开发表的钻孔。利用莱州湾南岸新近钻取的孔深452m的HLL01孔沉积物样品,进行了详细的磁性地层学研究。结果表明,1HLL01孔共有272块样品用于建立钻孔的磁性地层序列,可识别出10个正极性时段和9个负极性时段;2通过与国际标准极性年表的对比,确定HLL01孔记录了正极性亚时C3An.2n~C1n(布容正极性时)的沉积,钻孔底部位于C3An.2n,年龄约为6.6Ma;3钻孔内中、上新世的界线位于340m,上新世与更新世的界线位于140m;4通过与渤海湾及其北岸的研究成果对比,发现莱州湾自晚中新世以来的环境演化过程与之存在一定的差异性。
[Abstract]:The marginal seas of the Asian continent play a key role in regional energy and material exchange and in the evolution of climate and environment. The magnetic stratigraphy method is an effective means to establish the chronological framework. In the past, the study of long bore holes in the Bohai Sea area was mainly focused on the Bohai Bay and its northern coast. There have not been long published boreholes in the Laizhou Bay area. The sediment samples from the newly drilled HLL01 hole 452m deep along the south coast of Laizhou Bay are used. A detailed study of magnetic stratigraphy has been carried out. The results show that 272 samples are used to set up the magnetic stratigraphic sequence of the boreholes, and 10 positive and 9 negative polarity periods can be identified by comparison with the international standard polarity chronograph. It was determined that the HLL01 hole recorded the deposition of positive subtemporal C3An.2nC1n. The bottom of the borehole was located in C3An.2n. The boundary of Pliocene and Pleistocene is located at 340 m, and the boundary of Pliocene and Pleistocene is located at 140 m4. By comparing with the research results of Bohai Bay and its northern coast, it is found that the environmental evolution process of Laizhou Bay since the late Miocene is quite different from that of Pliocene.
【作者单位】：中国地质调查局天津地质调查中心;中国地质调查局泥质海岸带地质环境重点实验室;同济大学海洋与地球科学学院海洋地质国家重点实验室;
【基金】：中国地质调查局项目(编号:1212011220484) 国家自然科学基金项目(批准号:41402153)
【分类号】：P736.223

【相似文献】