A sediment sequence,from Fangshan in the Beijing Basin,has been sampled for paleomag-netic studies.The 1430 paleomagnetic samples possess a strong and stable magnetic remanence.A high-res-olution record of secular var...A sediment sequence,from Fangshan in the Beijing Basin,has been sampled for paleomag-netic studies.The 1430 paleomagnetic samples possess a strong and stable magnetic remanence.A high-res-olution record of secular variation in North China over the past 15 ka B.P.has been provided.Spectral anal-yses have shown that main periods of inclination,declination and relative intensity are about 1000,2000 and4000 a;800,1640 and 3300 a;and 820,1200,2200 and 3300 a;respectively.Two excursions have beendiscovered,and the correlation between the geomagnetic intensity variations and the climatic changes hasbeen discussed.展开更多
基金the Xi'an Laboratory of Loess and Quaternary Geology,Academia Sinica.
文摘A sediment sequence,from Fangshan in the Beijing Basin,has been sampled for paleomag-netic studies.The 1430 paleomagnetic samples possess a strong and stable magnetic remanence.A high-res-olution record of secular variation in North China over the past 15 ka B.P.has been provided.Spectral anal-yses have shown that main periods of inclination,declination and relative intensity are about 1000,2000 and4000 a;800,1640 and 3300 a;and 820,1200,2200 and 3300 a;respectively.Two excursions have beendiscovered,and the correlation between the geomagnetic intensity variations and the climatic changes hasbeen discussed.
