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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。
The marginal seas in the Asian continent play a key role in regional energy and material exchange and in the evolution of climate and environment, and magnetic stratigraphy is an effective means of establishing a framework of the age. In the past, research on long boreholes in the Bohai area mainly concentrated in the Bohai Bay and its north bank. There are not yet long public drill holes in the Laizhou Bay area. A detailed magnetostratigraphic study was carried out using the newly drilled hole HLL01 of 452m deep in the southern bank of Laizhou Bay. The results show that a total of 272 samples from the 1HLL01 well were used to establish the magnetic stratigraphic sequence of the boreholes, identifying 10 positive and 9 negative polarity periods; 2 determining the HLL01 well record by comparison with the international standard polar chronology The positive sub-C3An.2n ~ C1n (Cloth Positive Polarity) deposition, the bottom of the hole is located C3An.2n, age is about 6.6Ma; 3 drilling, the Pliocene boundary located at 340m, on the new The boundary between the world and the Pleistocene is located at 140m. 4 By comparing with the research results of Bohai Bay and its north bank, it is found that there are some differences in the environmental evolution of Laizhou Bay since the late Miocene.