内蒙古扎鲁特旗地区更新世地层划分
Pleistocene Stratigraphic Division in Zhaluteqi Region, Inner Mongolia
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摘要: 根据孢粉组合特征及光释光测年结果，对分布在内蒙古东南部的第四系更新统做了进一步的划分和研究。研究结果表明，主要分布在内蒙古东南部的中更新统风积物，岩性为黄色亚砂土，含钙质结核，发育柱状节理，区域上称乌尔吉组，含Artemisia-Ephedra-Pinus孢粉组合，光释光测年结果为(40.4±1.9)~(110.0±7.5)ka； 下更新统沉积物，岩性为红褐色亚砂土及亚黏土，含钙质结核、砂砾透镜体，区域上称为赤峰黄土,含Artemisia-Polygonum-Betula孢粉组合，光释光测年结果为（200.9±9.6）~（220.4±13.2）ka。上述2套地层在内蒙古东南部广泛分布，更新世地层的划分为内蒙古东南部地区的第四系地层划分对比研究提供了基础地质资料。Abstract: The Pleistocene strata with stable regional extension in the southeast Inner Mongolia are divided by pollen assemblages and optically stimulated luminescence (OSL) dating. The eolian sediment of the middle Pleistocene with good columnar joint and OSL age from (40.4±1.9)ka to (110.0±7.5)ka, corresponding to the Wuerji Formation, is composed of yellow sandy loam, calcareous nodule and Artemisia-Ephedra-Pinus pollen assemblages. The lower Pleistocene with OSL age from (200.9±9.6)ka to (220.4±13.2)ka, corresponding to the Chifeng Loess, is composed of reddish brown sandy loam, sandy clay, calcareous nodule, gravel lens and Artemisia-Polygonum-Betula pollen assemblages. These provide basic data for Quaternary stratigraphic correlation and division in the southeast Inner Mongolia.
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