5.30Ma以来华北哺乳动物群与磁性地层序列

Mammalian Faunas and Magnetostratigraphic Sequence in North China Since 5.30Ma

通过中国北方５．３０Ｍａ以来含丰富哺乳动物化石的典型剖面的磁性地层研究，建立５．３０Ｍａ以来中国北方陆相哺乳动物群与磁性地层序列对比。中国黄土记录了Ｂｒｕｎｈｅｓ正极性带与Ｍａｔｕｙａｍａ负极性带，黄土年龄约２．５０ＭａＢ．Ｐ．，其中发现有午城动物群、公王岭动物群、阳郭动物群、陈家窝动物群与靖远动物群。三门组记录了Ｍａｔｕｙａｍａ负极性带下段，年龄约１．２０—２．５０Ｍａ，其中发现有三门动物群。静乐剖面的静乐红土对应于Ｇａｕｓｓ正极性带上段，年龄约２．５０—３．００Ｍａ，其中发现有静乐贺丰动物群。游河组记录了Ｇａｕｓｓ正极性带，年龄约２．５０—３．４０Ｍａ，其中发现游河动物群。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—３．４０Ｍａ。其中小长梁剖面记录了Ｂｒｕｎｈｅｓ正极性带与Ｍａｔｕｙａｍａ负极性带上段（含Ｊａｒａｍｉｌｏ亚带），年龄约０．１３—１．００Ｍａ（其中含化石及石器地层年龄约０．９０—１．００Ｍａ）。榆社盆地麻则沟组记录了Ｇａｕｓｓ正极性带（２．５０—３．４０Ｍａ），高庄组记录了Ｇｉｌｂｅｒｔ负极性带（３．４０—５．３０Ｍａ）。

Magnetostratigraphy has been used to study the typical sections, where aboundant mammalian faunas were found, in North China since 5.30Ma B.P.. And the relation between mammalian faunas and magnetostratigraphic sequence has been established. Brunhes normal polarity zone and Matuyama reversal polarity zone were recorded in the Chinese loess, which was formed since 2.50Ma B.P. The Wucheng, Gongwangling, Yangguo, Chenjiawo and Jingyuan mammalian faunas were found in the loess. The Sanmen Formation recorded the bottom of Matuyama zone (1.20~2.50Ma B.P.). The Jingle red clay corresponds to Gauss normal polarity zone and Gilbert reversal zone as well (2.50~3.00Ma B.P.). The Youhe Formation recorded Gauss zone (2.50~3.40Ma B.P.). The deposition of Nihewan lakebasin can be compared with the Brunhes, Matuyama and Gauss zones (0.13~ 3.40Ma B.P.). In Xiaochangliang section, the Brunhes zone and the upper of Matuyama zone were recorded (0.13~1.00Ma B.P.). The age of the fossils in Xiaochangliang section is about 0.90~1.00Ma B.P. In Yushe basin, the Gauss and Gilbert zones were recorded in the Macegou Formation (2.50~ 3.40Ma B.P. ) and the Gaozhuang Formation (3.40~5.30Ma B.P.) respectively.