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中文摘要：
以武汉市东西湖区第四系沉积物ZK25钻孔为例,通过AMS14C年代测定及其粒度与正构烷烃等环境代用指标分析,初步揭示了该孔第四纪沉积环境及晚更新世以来的古气候变化特征。结果显示,该区早更新世为河流沉积,至晚更新世出现河湖相交替沉积,较为干旱;进入全新世由于降雨增多而沉积了较厚的冲积层,随后变得冷干;全新世中期则变成稳定的水动力较弱的洼地湖环境,气候温暖并由干旱变得湿润;全新世晚期气候温凉,呈现温干-温湿的变化特征。
英文摘要：
Base on the constructed AMS14C calendar age,the components of n-alkanes and grain size of Quaternary sediments in bore ZK25 are used to elucidate the changes of sedimentary environment and palaeoclimate since Late Pleistocene.The results indicate that Late Pleistocene and Holocene environment experiences four stages in Dongxihu district between Yangtze River and Hanjiang River.In the stage I of Early Pleistocene,there were alluvial deposits in the ZK25 core,replaced by lake deposits with alluvial deposits.In the Late Pleistocene,climate was arid and was ended by an obvious cold/dry event.In stage Ⅱ,precipitation increased in the early period of Holocene and thick alluvium was deposited.In stage Ⅲ,it was still warm but changed from arid to wet during the middle period of Holocene and deposition environment was changed to low-level lake.In stage Ⅱ,temperature decreased and showed a cool period in Late Holocene with a trend from dry to wet.
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