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地球学报  2004 

罗布泊AK1孔沉积物地球化学组成与古气候

Keywords: 罗布泊,氧化物,Ak1孔,易溶盐,古气候

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Abstract:

通过对罗布泊东部阿奇克谷地中部AK1孔沉积物中易溶盐组分及氧化物特征的研究,综合沉积序列及岩性变化特征,初步分析了罗布泊阿奇克谷地晚第三纪以来的沉积环境及古气候演化。结果表明,阿奇克谷地第三纪晚期即开始出现成化湖泊沉积,易溶盐以SO2-^4、Cl^-、Na^为主,各离子含量最高;第四纪以来沉积环境与古气候均有明显变化,早更新世气候以干冷为主,中更新世易溶盐组分中各离子浓度明显降低,以Cl^-降低最显著,气候转为温湿;中更新世晚期气候湿润,湖相沉积范围扩大,为罗布泊湖的一次大发展期;晚更新世以来湖泊环境波

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