| 长江三角洲顶部冰后期地层的沉积特征 |
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| 引用本文： | 魏乃颐,杨献忠,于俊杰,蒋仁,赵玲,张宗言,马雪,劳金秀.长江三角洲顶部冰后期地层的沉积特征[J].资源调查与环境,2010,31(2):79-86. |
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| 作者姓名： | 魏乃颐 杨献忠 于俊杰 蒋仁 赵玲 张宗言 马雪 劳金秀 |
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| 作者单位： | 南京地质矿产研究所,江苏南京,210016 |
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| 基金项目： | 中国地质调查局地质调查项目 |
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| 摘 要： | 钻探证实,镇江市谏壁镇长江北岸高桥镇北部埋藏硬粘土层,之上为冰后期松散沉积物.沉积物主要为粉砂、粘土质粉砂、砂泥互层,中部局部夹含细砾中细砂,顶部见淤泥质粘土;夹数十层植物炭屑层;以水平纹理为主,局部见小型交错层理、波状层理.表明冰后期以来该地处于水动力较弱的河湖环境,为多期湖沼相沉积夹汊道河流相沉积,局部有海相沉积物加入.根据碳化植物碎屑14C年龄,推测冰后期底界年龄约13 000 aBP,海侵到达该地的时间约为9 000 aBP,海侵最高位时间约为6 500 aBP.冰后期平均沉积速率约为4.9 m/ka,湖沼相3.4～6 m/ka,河流相10～15 m/ka.对全新统的底界年龄和海相层的埋藏深度进行了讨论.
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| 关 键 词： | 长江三角洲 冰后期地层 全新世 松散沉积层 14C年龄 镇江市 |
Sedimentary features of postglacial strata at the top of Changjiang River Delta |
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| WEI Nai-yi,YANG Xian-zhong,YU Jun-jie,JIANG Ren,ZHAO Ling,ZHANG Zong-yan,MA Xue,LAO Jin-xiu.Sedimentary features of postglacial strata at the top of Changjiang River Delta[J].Resources Survey & Environment,2010,31(2):79-86. |
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| Authors: | WEI Nai-yi YANG Xian-zhong YU Jun-jie JIANG Ren ZHAO Ling ZHANG Zong-yan MA Xue LAO Jin-xiu |
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| Institution: | WEI Nai-yi,YANG Xian-zhong,YU Jun-jie,JIANG RenZHAO Ling,ZHANG Zong-yan,MA Xue,LAO Jin-xiu(Nanjing institute of Geology and Mineral Resources,Nanjing,210016,China) |
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| Abstract: | It is confirmed by borehole data that the sediments above the buried hard clay layer in northern Gaoqiao town,Zhenjiang city,north bank of Yangtze River,are postglacial loose sediments.Sediments are mainly silt,clayey silt and sand intercalated with mud(sand-mud);the medium-fine sand with fine gavel is found in the middle part and the puddly clay at the top.There are tens of carbonized plant fragment interbeds in sediments.The lamination types of postglacial strata are primarily horizontal lamination and lo... |
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| Keywords: | Changjiang River Delta postglacial strata Holocene loose sediment layer 14C age hard clay layer Zhenjiang city |
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