摘要
兰田黄土剖面厚约132m。更新统黄土不整合地覆盖在第三系红粘土层之上。在该削面采集了147组古地磁样品,经古地磁测定,结果显示B/M界限位于L_8之中,贾拉米洛事件位于S_(11)至S_(12)层段,奥尔都维事件位于S_(28)—S_(32)层段,在该剖面首次发现留尼昂亚时。结果表明:更新世黄土与第三纪红粘土的界线同M/Ga界限一致,兰田黄土最早形成于2.45Ma,据此推测兰田陈家窝猿人化石年龄为0.66Ma,公王岭猿人化石年龄为1.15Ma。
The Lantian loess section is about 132 m thick, The Pleistocene loess overlies unconformably the Neogene red clay. About 147 groups of paleomagnetic samples were collected from the section, All the samples were measured after thermal demagnetization by use of the Minispin magnetometer in the laboratory of the South China Sea Headquaters of Geological Investigation, Ministry of Geology and Mineral Resources.This paper only presents the results of magnetostratigraphical research on the Lantian loess section. The results show that the B/M boundary is located in L8 (8th layer of loess). The Jaramillo (J) Polarity Subchron corresponds to the interval from S11 to S12 and the Lantian Polarity Subchron is located in the upper part of the lst silt layer. The Reunion (R) Polarity Subchron was found at the section. This is the first report of the R Subchron in, the Chinese loess section. The result shows that the boundary between the Pleistocene loess and the Neogene red clay coincides with the Matuyama and Gauss boundary. The Lantian loessbegan to form at 2.45 Ma ago.So the skull of Lantian Man discovered at Gongwangling was dated at about 1.15 Ma B. P. and a jaw of Lantian Man discovered at Chenjiawocun was dated at about 0.60 Ma B.P.
出处
《地质论评》
CAS
CSCD
北大核心
1989年第5期479-488,共10页
Geological Review
