| 罗布泊AK1孔沉积物地球化学组成与古气候 |
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| 引用本文： | 王永,赵振宏,林景星.罗布泊AK1孔沉积物地球化学组成与古气候[J].地球学报,2004,25(6):653-658. |
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| 作者姓名： | 王永 赵振宏 林景星 |
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| 作者单位： | 中国地质科学院地质研究所，北京，100037;中国地质大学，北京100083;新疆地质勘查局第二水文地质大队，新疆昌吉，831100;中国地质科学院地质研究所，北京100037 |
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| 基金项目： | 国土资源部环境司资助项目“罗布泊地区第四纪地质与环境” |
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| 摘 要： | 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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| 关 键 词： | 罗布泊 氧化物 Ak1孔 易溶盐 古气候 |
Pleoclimate and Geochemical Composition of AK1 Core Sediments in Lop Nur, Xinjiang |
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| WANG Yong,ZHAO Zhen-hong and LIN Jing-xing.Pleoclimate and Geochemical Composition of AK1 Core Sediments in Lop Nur, Xinjiang[J].Acta Geoscientia Sinica,2004,25(6):653-658. |
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| Authors: | WANG Yong ZHAO Zhen-hong and LIN Jing-xing |
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| Institution: | Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037; China University of Geosciences, Beijing 100083;No.2 Hydrogeological Party, Xinjiang Bureau of Geology and Mineral Resources, Changji, Xinjiang, 831100;Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037 |
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| Abstract: | A study of soluble salt and oxide content of Ak1 core sediments in eastern Aqike depression of Lop Nur area indicates that the Aqike depression has been a saline lake since Late Tertiary. Due to the presence of high percentages of SO 2- 4,Cl- and Na+, the lower part of Ak1 core (Late Tertiary) sediments generally contain higher soluble salts than Early Quaternary sediments. The middle part of the core sediments has lower content of soluble salts, especially Cl- and Na+, and has predominantly SO 2- 4 and Ca 2+ ions, indicating a wet and warm climate condition. The upper part of the strata has predominantly Cl-, SO 2- 4 and Na+ ions in soluble salt, and the soluble salt content changes rapidly, indicating a wetting-drying fluctuation trend of the area. The uppermost part of sedimentary strata in the Ak1 core contains rock salt and soluble salt which are mainly composed of Cl- and Na+ ions, and the ions in soluble salt is the highest in this stage, representing an evolutionary trend of the paleolake towards a stage of chlorite lake. These phenomena might be considered to be the beginning of an extremely arid climate condition. |
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| Keywords: | Lop Nur soluble salt paleoclimate Ak1 core oxide |
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