摘要
通过渤海QD-3134孔位连续沉积岩芯所记录的5000aB.P.以来地磁场要素(主要是D和I及磁场相对强度)的系统测量分析结果表明,其时空变化特征与黄河中-下游区域考古地磁的测量分析结果相吻合。由变化特征显示出:I及地磁场相对强度的明显变化界线位于2500aB.P.左右,此界线与该区域孢粉及有孔虫分析显示出的组合明显变化界线相一致。D的明显变化界线位于2000aB.P.左右,此界线与竺可桢等统计分析的中国北方5000aB.P.以来的气候的明显变化界线相一致。这种变化的相关性进一步分析显示出,自龙山文化期以来,I由高值向低值变化及D由酉偏转向东偏,与气候温湿特征对应,I由低值向高值变化及D由东偏转向西偏,与温干气候特征相对应;I及D突变时期与灾害气候环境变化相对应。
Through a systematic measurment and analysis of the records of geomagnetic field elements (mainly D, I and magnetic field relative intensity) derived from the Bobal Sea post continuous sediment cores, the results suggest the time and space characteristics of its changes are identical with the measured and analysed archaeomagnetic results deny6d from the region of the middle and lower reachal of the Yellow River. The characteristics of the changes indicate:the boundary of the apparent change I and the geomagnetic field relative intensity are identical, and D is located at around 2500 a B. P. the boundary is consistent with the combination apparent change boudary indicated by the region's palynological and foraminiferal analyses,D's apparent change boudary is located at around 2000 a B. P., and is consistent with the apparent change boundary of the climate change of North China since 5000 a B. P. as shown by Kezhen Zhu et al'sstatistical indicates: since the Longshan culture peeriod,I has change from higher value to lower value and D has rotated from west to east, these two chanses correspond to warm and wet climatic features; I has changed from lower value to hisher value and D rotated from east to west, which correstpond to warm and dry climatic features; I and D sudden change periods correspond to the change of disastrous climatic environment.
出处
《黄渤海海洋》
CSCD
1995年第3期20-25,共6页
Journal of Oceanography of Huanghai & Bohai Seas
基金
国家科学基金
关键词
地磁场要素
时空变化
气候环境变化
Geomagnetic field elements Sudden change period Change of disatrous climatic environment