| 长江三角洲南部平原古河谷充填沉积物特征及古地理意义 |
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| 引用本文： | 赵宝成,王张华,李晓.长江三角洲南部平原古河谷充填沉积物特征及古地理意义[J].古地理学报,2007,9(2):217-226. |
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| 作者姓名： | 赵宝成 王张华 李晓 |
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| 作者单位： | 1.华东师范大学地理系 上海200062;2.上海市地质调查研究院 上海200092 |
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| 摘 要： | 利用典型钻孔P5孔沉积物的岩性、测年、孢粉和有孔虫的分析结果，探讨了末次冰消期以来长江三角洲东南部古河谷区记录的气候波动和海平面阶段性上升过程及其控制下的古河谷沉积模式。研究发现本区古河谷末次冰消期（15～10 ka BP）以淡水湖沼相沉积为主，4 m厚的泥炭可能是新仙女木事件的反映。10～9 ka BP 发育滨海相粉细砂、粉砂沉积，反映此时海平面较为稳定。9～8 ka BP发育溺谷相泥质粉砂、粉砂质泥沉积，厚达11 m，反映海平面快速上升作用下的高速率充填。至全新世大暖期，古河谷区沉积顶界已和长江三角洲平原的第一硬土层埋深大致相同，反映古河谷已基本被填平。
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| 关 键 词： | 下切古河谷 海平面阶段性上升 末次冰消期 长江三角洲南部平原 |
| 文章编号： | 1671-1505（2007）02-0217-10 |
| 收稿时间： | 2005-11-14 |
| 修稿时间： | 2006-09-10 |
Characteristics and palaeogeographic significance of paleo-incised valley sediments in southern Changjiang Delta Plain |
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| Zhao Baocheng,Wang Zhanghua,Li Xiao.Characteristics and palaeogeographic significance of paleo-incised valley sediments in southern Changjiang Delta Plain[J].Journal of Palaeogeography,2007,9(2):217-226. |
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| Authors: | Zhao Baocheng Wang Zhanghua Li Xiao |
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| Institution: | 1.Department of Geography, East China Normal University, Shanghai200062;2.Institute of Shanghai Geological Survey, Shanghai200092 |
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| Abstract: | A typical borehole P5 was examined for lithology, dating, spore-pollen and microfossil to reveal the phases of climate and sea level fluctuation and the associated sedimentary facies recorded in the paleo-incised valley sediments in the southeastern Changjiang Delta Plain since the last deglaciation. The results show that freshwater marsh facies prevailed in the paleo-incised valley during 15 - 10 ka BP. A peat layer, 4 m thick, evidenced the cooling event of Younger Dryers. Coastal silty sand and silt dominated the strata of paleo-incised valley, reflecting the relatively stable sea level during 10 - 9 ka BP. Muddy silt and silty mud was 11 m thick during 9 - 8 ka BP, reflecting the quick deposition in the drowned valley due to the rapid rise of sea level. The deposition surface of the valley approximated to the buried depth of stiff muds in the delta plain at the beginning of the Holocene optimum, indicating the termination of filling in the paleo-incised valley. |
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| Keywords: | paleo-incised valley phases of sea level rise last deglaciation southern Changjiang Delta Plain |
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