甜水沟全新世黄土-古土壤序列风化程度及意义  

Weathering Intensity of the TSG Holocene Loess-paleosol Sequence and Its Significance

作　　者：王丽娟[1] 庞奖励[1] 黄春长[1] 丁敏[1] 牛晓露[1] 李艳华[1] 

机构地区：[1]陕西师范大学旅游与环境学院,西安710062

出　　处：《地理科学进展》2011年第3期379-384,共6页Progress in Geography

基　　金：国家自然基金重点项目(41030637);中央高校基本科研业务费专项基金项目(GK200901007)

摘　　要：对大荔人遗址的甜水沟剖面(TSG)全新世黄土-古土壤序列中常量元素含量、磁化率和Rb/Sr比值进行了研究和比对。结果表明:在TSG剖面发育过程中,Ca、Mg、Na表现为迁移淋失,Si、K呈现弱富集特征,Fe的迁移不明显;磁化率、钾钠比、硅铝铁率、SiO2/(MgO+CaO)(、CaO+K2O+Na2O)/Al2O3的分布随地层的变化而同步变化。上述变化指示古土壤S0形成时期,化学风化程度强烈和气候温暖湿润,黄土L0和Lt堆积时期,风化成壤作用较弱和气候相对干旱,而全新世晚期可能曾出现过一次较为暖湿的次级气候变化。A Holocene loess-paleosol sequence was found at Tian-shui-gou （TSG） site, Dali. A detailed study on contrast the contents of major elements, magnetic susceptibility and Rb/Sr ratio was conducted in this paper to explore the environmental features in the Holocene. The analytical results show that Ca, Mg and Na are leached, Si and K are relatively enriched, but the transport phenomenon of Fe is not obvious. The distributions of magnetic susceptibility, Rb/Sr ratio, SiO2/（Al2O3＋Fe2O3）, SiO2/（MgO＋CaO） and （CaO＋K2O＋Na2O）/Al2O3 imply that during the paleosol（S0） formation, chemical weathering was stronge, and the climate was warm and humid, while during the stage of loess（L0, Lt） accumulation, weathering intensity was weakened, and the climate turned to be relatively dry. There would be a climate change in the late Holocene.

关 键 词：风化程度 黄土 古土壤 全新世 大荔人遗址 甜水沟 

分 类 号：P532[天文地球—古生物学与地层学]