澧阳平原晚冰期短尺度气候变化的风成沉积物稀土元素和粒度记录

摘要/Abstract

摘要： 澧阳平原SL剖面的系统采样和室内稀土元素分析、粒度分析和AMS14C年代测定,揭示了澧阳平原岗地黄土剖面成因特征,探讨了澧阳平原晚冰期短尺度的气候变化过程。结果表明,澧阳平原岗地黄土在稀土元素配分模式上与黄土高原黄土-古土壤、镇江下蜀黄土具有高度的一致性,而且岗地剖面沉积物无任何水流作用痕迹,因此表明,澧阳平原岗地黄土剖面为风成成因。粒度结果表明,SL剖面较好地记录了晚冰期短尺度的气候变化过程,SL遗址剖面自然沉积物记录了晚冰期千年尺度的气候事件,如BL事件、Older YD事件、AL事件、YD事件。SL剖面全新世早期表现为升温阶段,9.0～8.00 ka BP的彭头山文化在此区兴起,表明此时气候相当适宜,适合人类生存。

关键词: 澧阳平原, 晚冰期, 粒度, 稀土元素, 东亚季风

Abstract: Based on field investigation, sampling, and experimental analysis such as grain size and rare earth elements(REE) analysis, as well as AMS14C dating at the SL soil profile in the Liyang plain, the soil formation process has been revealed, and the short-term climate change events in Late glacial have been determined. The results show the REE distribution patterns of sediments from SL soil profile in Liyang Plain is similar to those of loess-paleosol in the Loess Plateau, and Xiashu loess in Zhenjiang. Moreover, field investigation results show the sediments have no trace of fluvial. Therefore, sediments from SL profile were formed by dust depositions. The results of grain-size analysis proved that the SL profile has well recorded the climate change processes in Late glacial, and high-resolution climate events were revealed, such as BL event (14.74 ka BP to 13.82 ka BP), Older YD event (13.82 ka BP to 12.86 ka BP), AL event (12.86 ka BP to 11.46 ka BP), YD event (9.9 ka BP to 9.00 ka BP). During 9 000~8 000 a BP, the weather was so good that people moved to the tableland in Liyang Plain, resulting in the rising of PengTouShan culture some connection with the paleolithic and Neolithic culture in middle reaches of Changjiang River.

Key words: Liyang Plain, Late glacial, grain-size, rare earth elements, east Asian Monsoon

中图分类号:

P532

毛龙江;莫多闻;周昆叔;郭伟民;杨竞竞红;邓辉;史辰羲;贾敬禹. 澧阳平原晚冰期短尺度气候变化的风成沉积物稀土元素和粒度记录[J]. 中国沙漠, 2010, 30(2): 267-272.

MAO Long-jiang;MO Duo-wen;ZHOU Kun-shu;GUO Wei-min; YANG Jing-hong;DENG Hui;SHI Chen-xi;JIA Jing-yu. Short-term Climate Events in Late Glacial Recorded by Rare Earth Elements and Sedimentary Grain-size in Tableland Profile in Liyang Plain, Hunan[J]. JOURNAL OF DESERT RESEARCH, 2010, 30(2): 267-272.

参考文献

[1]An Z S,Kukla G,Porter S C,et al.Late Quaternary dust flow on the Chinese loess platrau[J].Catana,1991,18:125-132.
[2]李晋昌,董治宝,王训明.中国北方东部地区春季降尘量及其环境意义[J].中国沙漠,2008,28(2):195-201.
[3]毛龙江,刘晓燕,许叶华.南京江北地区下蜀黄土粒度分形与全新世环境演变[J].中国沙漠,2006,26(2):264-267.
[4]Ding Zhongli,Yu Zhiwei,Rutter,N W,et al.Towards an orbital time scale for Chinese Loess Deposits[J].Quaternary Science Reviews,1994,358:485-488.
[5]贾耀锋,庞奖励.关中盆地东部全新世剖面粒度组成与气候变化研究[J].中国沙漠,2004,24(2):153-155.
[6]鹿化煜,安芷生.洛川黄土粒度组成的古气候意义[J].科学通报,1997,42（1）:66-69.
[7]陈宝群,黄春长,李平华.陕西扶风黄土台塬全新世成壤环境变化研究[J].中国沙漠,2004,24(2):149-152.
[8]王中刚,于学元,赵振华,等.稀土元素地球化学[M].北京:科学出版社,1989.
[9]朱丽东,周尚哲,叶玮,等.网纹红土稀土元素地球化学特征的初步研究[J].中国沙漠,2007,27（2）:194-200.
[10]Ding Z L,Sun J M,Yang S L,et al.Geochemistry of the Pliocene red clay formation in the Chinese Loess Plateau and implications for its origin,source provenance and paleoclimate change[J].Geochimica et Cosmochimica Acta,2001,65(6):901-913.
[11]Jiang S Y,Zhao H X,Chen Y Q,et al.Trace and rare earth element geochemistry of phosphate nodules from the lower Cambrian black shale sequence in the Mufu Mountain of Nanjing,Jiangsu province,China[J].Chemical Geology,2007,212:1-35.
[12]Jin Z D,Li F C,Cao J J,et al.Geochemistry of Daihai Lake sediments,Inner Mongolia,north China:Implications for provenance,sedimentary sorting,and catchment weathering[J].Geomorphology,2006,80:147-163.
[13]杨守业,李从先.REE示踪沉积物物源研究进展[J].地球科学进展,1999,14(2):164-167.
[14]郭伟民.澧阳平原的考古学启示[J].中原文物,2005(6):43-53.
[15]吴明清,文启忠,潘景瑜,等.黄河中游地区马兰黄土的稀土元素[J].科学通报,1991,36(5):366-369.
[16]李徐生,韩志勇,杨达源,等.镇江下蜀黄土的稀土元素地球化学特征研究[J].土壤学报,2006,43(1):1-7.
[17]毛龙江,莫多闻,杨兢红,等.环洞庭湖区网纹红土稀土元素地球化学特征[J].环境化学,2008,27(2):222-225.