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长江三峡大宁河流域3000年来的沉积环境和风尘堆积

SEDIMENTARY ENVIRONMENT AND EOLIAN DEPOSITS IN PAST 3000 a IN DANING VALLEY OF THE THREE GORGES OF THE YANGTZE RIVER

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【作者】 张芸朱诚张强郑若葵

【Author】 ZHANG Yun 1,ZHU Cheng 1,ZHANG Qiang 1,ZHENG Ruo kui 2 ( 1Department of Urban and Resources Sciences,Nanjing University,Nanjing 210093,China; 2Institute of Archaeology,Chinese Academy of Social Sciences,Beijing 100710,China)

【机构】 南京大学城市与资源学系中国社会科学院考古研究所 南京210093南京210093北京100710

【摘要】 对长江三峡大宁河流域双堰塘剖面的粒度、磁化率和氧化物进行了综合分析 ,揭示了该区 30 0 0 a来的沉积环境变化 ,并对全新世第 1寒冷期的风尘堆积作了初步探讨。该区 30 0 0 a来的风尘堆积是在全新世第 1寒冷期 (10 0 0~ 85 0 BC) ,即是亚北方期又是新冰期时形成的。而此寒冷期又存在次一级的气候波动。风尘堆积下层是在干凉气候下形成的原始风尘堆积 ,而上层气候趋于冷湿 ,流水作用增强 ,原始风尘堆积被流水搬运 ,在此形成次生黄土。由于所受水动力条件和风化程度的不同 ,本区风尘堆积与长江下游地区的风尘堆积以及北方黄土之间存在着明显的差异之处

【Abstract】 Synthetic analyses of grain size,susceptibility and oxide of Shuangyantang profile in Daning valley,the Three Gorges of the Yangtze River reveal sedimentary environment changes and eolian deposits since 3 kaBP ago in this area.There was Holocene warm humid climate in the region,but eolian deposits are formed since 3 000 a ago during the first cold period of the Holocene(1000~850 B.C.)in this area,that was the Subboreal Phase or Neoglaciation Age of the Holocene.During this stage,there were short climatic oscillations according to susceptibility and oxide research.The lower layer of the eolian deposits was primary dust accumulation in cold arid climate,but the upper loess layer was formed in cool humid climate.Strong running water transported primary eolian deposit to form secondary loess.Different water powers and weathering levels made great differences between eolian deposits in this area and those in the Yangtze River and North Loess of the Pleistocene.

【基金】 国家自然科学基金资助项目 ( 4 0 0 710 83);高校博士点基金 ( 2 0 0 0 0 2 8414 );南京大学“985”自然地理重点学科建设项目;南京大学现代分析中心测试基金资助项目
  • 【文献出处】 海洋地质与第四纪地质 ,Marine Geology & Quaternary Geology , 编辑部邮箱 ,2001年04期
  • 【分类号】P534.63
  • 【被引频次】26
  • 【下载频次】207
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