大荔遗址磁信息的地质意义  

GEOLOGICAL SIGNIFICANCE OF PALAEOMAGNETIC DATA AT THE DALI MAN SITE

作　　者：霍俊杰[1] Reidar Lovlie 苏朴[3] 

机构地区：[1]成都理工大学、地质灾害防治与地质环境保护国家重点实验室,四川成都610059 [2]University of Bergen,Department of Earth Science,Allegt.41,N-5007 Bergen,Norway [3]太原理工大学矿业工程学院古地磁实验室,山西太原030024

出　　处：《地层学杂志》2009年第1期69-75,共7页Journal of Stratigraphy

基　　金：山西省留学基金01-28资助

摘　　要：完整的陕西大荔人遗址剖面由上部黄土—古土壤序列和下部砂土地层两部分组成。综合全剖面磁化率曲线对比和极性分析,以及和间隔遥远的古里雅冰芯氧同位素曲线的对比,得出上部黄土—古土壤序列由S0、L1、S1、L2、S2五层组成,下面的砂土层包含相当于L3、S3、L4、S4的地层(由上到下)。据此,再通过与黄土—古土壤磁化率年代曲线的对比,判定出大荔人头骨化石产出地层形成年代至少可以追溯到422ka前。以上结论得到了偏移事件(MonoLake事件,BLAKE事件和BiwaIII事件)的辅证。The intact stratigraphic profile at the Dali Man site consists of the upper Loess-Paleosol series and the lower sandy soil series. Comparison of magnetic susceptibility curves between Dali and the other profiles, comparison between Dali susceptibility curve and isotope curve of the Guliya ice core, and paleomagnetism polarity analysis all demonstrate that the upper Loess-Paleosol series consists of five units （i. e. S0 ,L1, S1 ,L2 ,S2 in descending stratigraphic order） and the lower sandy soil series consists of four units （L3 ,S3 ,L4 ,S4 in descending stratigraphic order）. Through comparison with geochronological curve of Loess-Paleosol magnetic susceptibility, a conclusion was drawn that the stratum bearing the Dali Man skull formed at least 422 ka, an inference that is indirectly supported by Mono Lake, Blake and Biwa Ⅲ polarity events.

关 键 词：磁化率 极性 磁性地层 黄土 古土壤 第四系 大荔 陕西 

分 类 号：P534.63[天文地球—第四纪地质学] P539.3[天文地球—古生物学与地层学]