燕山水库磁性地层与第四纪气候关系的探讨

A STUDY OF RELATIONSHIP BETWEEN MAGNETOSTRA-TIGRAPHY AND PALAEOCLIMATE IN QUATERNARY AT THE YANSHAN RESERVOIR

据杨湾村Ⅱ_(89-2)孔岩心样品的J_r及k值随孔深变化的规律获得:(1)孔深46.7m处为布容与松山极性带的分界。在布容极性带中测得哥德堡、布莱克、牙买加、Levantine、琵琶Ⅲ和BigLost等负极性亚带;在松山极性带中测得了Kamikatsura、贾拉米洛和Cobb Mountain等正极性亚带;(2)沉积物磁性J_r、k量值的变化与第四纪气候变化间有着极好的相关关系,这种关系可作为研究古气候变化的标志。文内根据其量值变化曲线的规律,尝试性地探讨了近110万年以来地球气候的短周期变化、长周期变化和冰期的时间分布特点,并推测了地球未来几万甚至几十万年内气候变化的总趋势。

This paper studies 270 palaeomagnetic samples taken from the core hole Ⅱ 89-2 which is 74. 9 meters deep and is located in Yanshan,Yexian County,Henan Province. Sampling interval is 0. 5 meter long. All of the samples were demagnetized with GSD-5 AF Demagnetizes and then the re-magnet magnetization J, and the magnetic susceptibility κ of each sample were measured. The measurements are presented as follows- (l)In Geomagnetic polarity colume of the drill,the Gothenburg, Blake, Jamaica, Levantine, Biwa Ⅲ , and Big Lost reversed polarity subzone in the Brunhes normal polarity zone and the Kamikatsura, Jaramillo and Cobb Mountain normal polarity subzone in the Matuyama reversed polarity zone were found; The boundary between the Brunhes and Matuyama is at the depth of 46. 7 meters. (2)Variation feature of the J, and κ of the samples coinsides with that of content of δ18O-PDB in the V28-238,V28-239 core holes located in the Pacific. These J1,κ can be used as marks for studying palaeoclimate in Quaternary. Based on this ,the paper discusses further the regularity of short and long circles of palaeoclimate in the past 1. 1 Ma and the variation feature of the climate in the coming several hundred thousands years.