中国北方陆相沉积5.30Ma磁性地层序列

Magnetostratigraphic Sequence of Continental Deposits in Northern China Since 5. 30 Ma

本文通过中国北方新第三纪晚期典型剖面的磁性地层研究,建立5.30 Ma以来中国北方陆相沉积磁性地层序列。中国黄土记录了Brunhes正极性带与Matuyama负极性带,年龄约2.50 Ma。静乐红土(包括静乐剖面,榆林剖面,蓝田剖面)对应于Gauss正极性带与Gilbert负极性带,年龄约2.50～5.30 Ma。三门组记录了Matuyama负极性带下段,年龄约1.20～2.50 Ma。游河组记录了Gauss正极性带,年龄约2.50～3.40 Ma。泥河湾沉积对应于Brunhes正极性带、Matuyama负极性带、Gauss正极性带,年龄约0.13～3.40 Ma。榆社盆地麻则沟组与高庄组分别记录了Gauss正极性带(2.50～3.40 Ma)与Gilbert负极性带(3.40～5.30 Ma)。新疆库车一带,上西域组记录了Matuyama负极性带下段(1.60～2.50 Ma),下西域组记录了Gauss正极性带(2.50～3.40 Ma),库车组记录了Gilbert负极性带(3.40～5.30 Ma)。

Magnetostratigraphy has been used to study typical sections in northern China in the interval 0~5. 30 Ma B P. A magnetostratigraphic sequence has been established. The Brunhes normal polarity zone and Matuyama reverse polarity zone were recorded in Chinese loess. The Jingle red clay (consists of red clay in the Jingle section, Yulin section and Lantian section) corresponds to the Gauss normal polarity zone and Gilbert reverse zone in the interval 2. 50~5. 30 Ma as well. The Sanmen Formation recorded the lower part of the Matuyama zone, and the Youhe Formation recorded the Gauss zon? The deposits of the Nihewan lake basin can be compared with the Brunhes zone, Matuyama zone and Gauss zone. In the Yushe basin, the Gauss zone and Gilbert zone were recorded in the Macegou and Gaozhuang Formations respecitvely. In the Kuqa area of Xinjiang, the upper part of the Xiyu Formation recorded the lower part of the Matuyama zone, while the lower part recorded the Gauss zone, and the Kuqa Formation recorded the Gilbert zone.