| 南京江北地区全新世沉积与古洪水研究* |
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| 引用本文： | 朱诚,于世永.南京江北地区全新世沉积与古洪水研究*[J].地理研究,1997,16(4):23-30. |
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| 作者姓名： | 朱诚 于世永 |
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| 作者单位： | 南京大学城市与资源学系 南京 210093 |
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| 基金项目： | 国家自然科学基金,高校博士点基金,南京大学测试基金 |
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| 摘 要： | 根据区域调查和对南京江北剖面沉积物及埋藏古树和炭化木的年代测定,以及对孢粉、粒度、石英砂表面特征鉴定分析,发现本区存在晚北方期至亚北方气候期(8200±126aBP、7822±250aBP～7670±160aBP、7562±90aBP、4085±95aBP～4090±100aBP以及3730±90aBP)具有洪积特征的天然剖面地层,该剖面位于长江北岸二级阶地上,其洪积层系由古洪水期长江摆动时沉积所致。剖面上部厚0.53m的灰黄色土层系在亚北方期大约3000aBP～2850aBP的寒冷期中主要由风尘搬运堆积所致。
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| 关 键 词： | 南京江北地区 全新世 古洪水 气候突变事件 |
| 收稿时间： | 1996-05-11 |
| 修稿时间： | 1997-04-21 |
HOLOCENE DEPOSITS AND PALEO-FLOODS ON THE NORTH BANK OF THE YANGTZE RIVER, NANJING AREA |
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| Zhu Cheng,Yu Shiyong,Shi Wei,Dai Dongsheng,Zhao Ningxi.HOLOCENE DEPOSITS AND PALEO-FLOODS ON THE NORTH BANK OF THE YANGTZE RIVER, NANJING AREA[J].Geographical Research,1997,16(4):23-30. |
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| Authors: | Zhu Cheng Yu Shiyong Shi Wei Dai Dongsheng Zhao Ningxi |
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| Institution: | Department of City and Resources Sciences, Nanjing University, Nanjing 210093 |
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| Abstract: | Field investigations and analyses of sediments, buried paleo-trees, gagatite, sporopollen, granularity, quartz-sand surface feature, oxide and chronology found a natural profile with pluvial characteristics during the Late-boreal phase to Subboreal phase (8 200±126 aBP, 7 822±250 aBP~7 670±160 aBP, 7 562±90 aBP, 4 085±95 aBP~4 090±100 aBP and 3 730±90 aBP). The sporopollen with more thermophilous coniferous-broad plant communities in the profile illustrates that the humid-hot climate should be a major climate during the period from 8 200±126 aBP to 3730±90 aBP. A large number of agatite, buried paleo-trees and sand-gravel with pluvial feature between the third layer and the ninth layer indicate that the period has experienced many times flood environments with megathermal pluvial climate. The investigation shows that the profile is situated in the second terrace on the north bank of the Yangtze River, its pluvial layer should be formed by the Yangtze River swinging and depositing during the paleo-flood period. In addition, the grey-yellow loess layer with thickness of 0.53m in the upper of the profile should be formed by dust transporting and accumulation during the cold period (3000 aBP~2850 aBP) of Subboreal phase by the analyses. |
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| Keywords: | north bank of the Yangtze River of Nanjing area Holocene paleo-floods climatic abnormal event |
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