大连周家沟黄土元素地球化学特征与环境

分析了辽南大连周家沟黄土剖面的常量元素、CaC03、pH值、有机质,并与相关反应的环境变化指标进行了对比.结果表明,周家沟黄土与黄土高原化学成分及含量相差不大,元素差异反映沉积期后气候环境因素不同;元素迁移和积聚在马兰黄土和离石黄土中表现不同,说明在中更新世晚期和晚更新世气候发生由温湿变为冷干的明显变化;氧化物比值综合参数表明,周家沟在晚更新世气候总的变暖趋势下经历了三次气候旋回波动.

Loess Elements Geochemistry and Its Environment in Dalian Zhoujiagou

It was demonstrated from the analysis of the major elements,CaCO3,pH value and organic matter of the loess profile of Zhoujiagou in south of Liaoning Province that these indicators had certain indicating meaning for the changes of ancient climate environment.The contents of chemical constituents and distribution of Zhoujiagou loess,loess plateau loess had little difference while difference of several elements was resulted from different climate and environment in the later deposition period.The loess was still in the early stage of weathering.The element performance of migration and accumulation of Zhoujiagou loess was different from Malan and Lishi loess,which showed that climate in the south of Liaoning Province in the late Pleistocene and late Pleistocene Epoch changed significantly,namely that humid climate and environment suddenly turned into cool and dry climate and environment.The comprehensive parameters of oxide ratio indicated that here undergone 3 cycles of climate fluctuations was under the total warming trend of the late Pleistocene climate.