临夏盆地新生代沉积物岩石磁学记录与亚洲内陆干旱化  

ROCK MAGNETIC RECORD OF CENOZOIC LAKE SEDIMENTS FROM THE LINXIA BASIN AND THE ARIDIFICATION OF ASIAN INLAND

作　　者：徐先海[1] 方小敏[2] 

机构地区：[1]安徽省安庆师范学院资源环境系,安庆246011 [2]中国科学院青藏高原研究所

出　　处：《海洋地质与第四纪地质》2007年第4期103-110,共8页Marine Geology & Quaternary Geology

基　　金：国家自然科学基金重点基础项目(40334038);国家重点基础研究发展规划项目(2005CB42200)

摘　　要：临夏盆地毛沟剖面沉积物岩石磁学记录与石英砂颗粒电子扫描研究表明：13.07-8.6 Ma间盆地气候一直保持相对稳定,从8.6 Ma开始,盆地沉积物中流域外的风尘物质开始增加,并经过了6.4 Ma和5.3 Ma的两次加速过程,揭示了我国西北内陆干旱气候可能从8.6 Ma左右开始,且在6.4 Ma和5.3 Ma左右经过两次加强过程。　By means of high resolution research of rock magnetic records and quartz sands from Maogou section in the Linxia basin,we reveal that after a relative stable environment between 13.07 and 8.6 Ma,the basin was gradually influxed by eolian dusts at about 8.6 Ma,and the fluxes of eolian dusts got two rapid increases at about 6.4 Ma and 5.3 Ma respectively.The study suggests that the drying of northwest China began at 8.6 Ma and was strengthened rapidly at about 6.4 Ma and 5.3 Ma.

关 键 词：岩石磁学 干旱化 高原隆升 全球变冷 临夏盆地 

分 类 号：P539.3[天文地球—古生物学与地层学]