武汉涨渡湖ZK04-1钻孔沉积物粒度、磁化率、孢粉组合特征及其环境演变
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摘要
通过对武汉新洲区涨渡湖农场ZK04-1钻孔剖面AMS~(14)C精确测年并校正,并对粒度、磁化率等环境代用指标进行分析与研究,佐以孢粉记录信息,重建该区域10 000年以来的环境演化过程:(1)9 916~8 472 aB.P,此阶段为温暖湿润的气候,涨渡湖为开放性湖泊,受长江河流主导;(2)8 472~5 434 aB.P,该阶段为多个冷暖湿干交替旋回气候,涨渡湖逐渐封闭并稳定生长,另外粒度及磁化率出现七次峰值,表明该阶段经历过七次洪水事件;(3)5 434~2 794 aB.P,该阶段气候由凉偏干、温暖偏湿渐变为炎热湿润,涨渡湖水位及湖面面积快速增长,并接受周围水系携带的大量磁性粗砂,导致粒度及磁化率陡然变大。
Through the accurate dating and correction of AMS~(14)C and research on the environmental index of particle size and magnetic susceptibility,combined with sporopollen information in ZK04-1 drilling in Zhangdu Lake of Xinzhou district of Wuhan,reconstruct the region of environmental evolution process for 10 000 years:(1)the age of 9 916 ~ 8 472 aB.P,this stage was warm and humid climate,the lake was dominated by the Yangtze Rive as an open lake;(2)the age of8 472 ~ 5 434 aB. P,the stage was a alternating climate,and the lake gradually closed and stable growth. In addition,the seven peaks of grain size and magnetic susceptibility showed that there were seven flood events at this stage;(3)the age of5 434 ~ 2 794 aB. P,the climate changed from cool to dry,warm and wet to hot and humid. The lake of water level and area increased rapidly,and accepted the surrounding water to carry a large number of magnetic coarse sand,resulting the particle size and magnetic susceptibility suddenly increase.
Through the accurate dating and correction of AMS~(14)C and research on the environmental index of particle size and magnetic susceptibility,combined with sporopollen information in ZK04-1 drilling in Zhangdu Lake of Xinzhou district of Wuhan,reconstruct the region of environmental evolution process for 10 000 years:(1)the age of 9 916 ~ 8 472 aB.P,this stage was warm and humid climate,the lake was dominated by the Yangtze Rive as an open lake;(2)the age of8 472 ~ 5 434 aB. P,the stage was a alternating climate,and the lake gradually closed and stable growth. In addition,the seven peaks of grain size and magnetic susceptibility showed that there were seven flood events at this stage;(3)the age of5 434 ~ 2 794 aB. P,the climate changed from cool to dry,warm and wet to hot and humid. The lake of water level and area increased rapidly,and accepted the surrounding water to carry a large number of magnetic coarse sand,resulting the particle size and magnetic susceptibility suddenly increase.
引文
[1]Oeschger H,Eddy J A.Global Change[J].Global Change of the Past,1989(6):3-25.
[2]Wei L Y,Lu Y C,Yin J H.Environmental changes recorded in lake sediments for 13 000-1 000 a B.P.in Beijing area[J].Chinese Science Bulletin,1998,43(13):1095-1100.
[3]Han Y L,Tan X D,Chen Z et al.Magnetic granulometry of recent sediments from the Hu guang Maar and its implication for provenience[J].Chinese Science Bulletin,2010,55(z1):418-424.
[4]Jin Z D,Wang S M,Shen J et al.Weak chemical weathering during the Little Ice Age recorded by lake sediments[J].Science in China:Series D,2001,44(7):652-658.
[5]Conroy J L,Overpeck J T,Cole J E et al.Holocene changes in eastern tropical Pacific cl climate inferred from a Galapagos lake sediment record[J].Quaternary Science Reciews,2008,27(11/12):1166-1180.
[6]霍炬,李启文.武汉东西湖区ZK02孔沉积物粒度特征及对沉积环境的指示[J].资源环境与工程,2015,29(3):259-266.
[7]谢远云,李长安,王秋良,等.江汉平原江陵湖泊沉积物粒度特征及气候环境意义[J].吉林大学学报(地球科学版),2007,37(3):570-577.
[8]王心源,吴立,张广胜,等.安徽巢湖全新世湖泊沉积物磁化率与粒度组合的变化特征及其环境意义[J].地理科学,2008,28(4):548-553.
[9]羊向东,朱育新,蒋雪中,等.沔阳地区一万多年来孢粉记录的环境演变[J].湖泊科学,1998,10(2):23-29.
[10]陈敬安,万国江.云南洱海沉积物粒度组成及其环境意义辨识[J].矿物学报,1999,19(2):175-182.
[11]Folk R L,Ward W C.Brazos River bar:A Study in the significance of grain size parameters[J].Journal of Sedimentary Petrology,1957,27(1):3-26.
[12]孙永传,李蕙生.碎屑岩沉积相和沉积环境[M].北京:地质出版社,1986:65-81.
[13]Dearing J A.Sedimentary indicators of lake-level changes in the humid temperate zone:a critical review[J].Journal of Paleolimnology,1997,18(1):1-14.
(1)原始数据和资料来源于湖北省地质调查院2011—2014年1∶5万新洲幅等四幅区调,2014。
[2]Wei L Y,Lu Y C,Yin J H.Environmental changes recorded in lake sediments for 13 000-1 000 a B.P.in Beijing area[J].Chinese Science Bulletin,1998,43(13):1095-1100.
[3]Han Y L,Tan X D,Chen Z et al.Magnetic granulometry of recent sediments from the Hu guang Maar and its implication for provenience[J].Chinese Science Bulletin,2010,55(z1):418-424.
[4]Jin Z D,Wang S M,Shen J et al.Weak chemical weathering during the Little Ice Age recorded by lake sediments[J].Science in China:Series D,2001,44(7):652-658.
[5]Conroy J L,Overpeck J T,Cole J E et al.Holocene changes in eastern tropical Pacific cl climate inferred from a Galapagos lake sediment record[J].Quaternary Science Reciews,2008,27(11/12):1166-1180.
[6]霍炬,李启文.武汉东西湖区ZK02孔沉积物粒度特征及对沉积环境的指示[J].资源环境与工程,2015,29(3):259-266.
[7]谢远云,李长安,王秋良,等.江汉平原江陵湖泊沉积物粒度特征及气候环境意义[J].吉林大学学报(地球科学版),2007,37(3):570-577.
[8]王心源,吴立,张广胜,等.安徽巢湖全新世湖泊沉积物磁化率与粒度组合的变化特征及其环境意义[J].地理科学,2008,28(4):548-553.
[9]羊向东,朱育新,蒋雪中,等.沔阳地区一万多年来孢粉记录的环境演变[J].湖泊科学,1998,10(2):23-29.
[10]陈敬安,万国江.云南洱海沉积物粒度组成及其环境意义辨识[J].矿物学报,1999,19(2):175-182.
[11]Folk R L,Ward W C.Brazos River bar:A Study in the significance of grain size parameters[J].Journal of Sedimentary Petrology,1957,27(1):3-26.
[12]孙永传,李蕙生.碎屑岩沉积相和沉积环境[M].北京:地质出版社,1986:65-81.
[13]Dearing J A.Sedimentary indicators of lake-level changes in the humid temperate zone:a critical review[J].Journal of Paleolimnology,1997,18(1):1-14.
(1)原始数据和资料来源于湖北省地质调查院2011—2014年1∶5万新洲幅等四幅区调,2014。