Luomaniya Disiji huang tu cheng ji de yan shi ci xue te zheng ji cheng tu mo shi tan tao

Translated title of the contribution: Magnetic properties of Romanian quaternary loess deposits and its significances

Hui Guo, Xiuming Liu, Bin Lü, Xiaoyao Chen, Zhi Liu, Mingming Ma, Guoyong Zhao, Pingyuan Li, Qu Chen

    Research output: Contribution to journalArticle

    Abstract

    The Mircea Voda loess paleosol sequence in Romania is located in the Dobrudja Plateau at a distance of about 13km from the Danube and 40km from the Black Sea coast(44°19'15″N,28°11'21″E).The climate of the Mircea Voda area is affected by the Mediterranean climate: hot and dry summer and wet and cold winter.Every year it generally has 6 months of dryness and 3months of drought.The meteorological data show that the average annual rainfall of the Dobrudja Plateau is 600~800mm,and the average annual evaporation is 476mm.About 30m of Quaternary aeolian deposits including five strongly developed pedo-complexes can be observed.The loess-paleosol sequences overlie limnic sediments of presumably lower Pleistocene age on Tertiary and Mesozoic sediments.By analyzing several magnetic parameters,such as Xlf,Xfd%,XARM,IRM,SIRM,J-T and hysteresis loop of Mircea Voda loess samples,their results show that the magnetic minerals of Mircea Voda loess-paleosol sequence are similar with that of Chinese loess,which are predominated by magnetite and maghemite,meanwhile,and goethite.Romanian loess shows a consistent loess paleosol pattern with the Xifeng loess in Chinese Loess Plateau,the pedogenic process was completed in a strongly oxidized environment,and the magnetic susceptibility has a positive correlation with the pedogenic process in general.The values of magnetic susceptibility are low in loess and high in paleosol,indicating that the glacial-interglacial circulation had a global influence.The pedogenic producing SP and SD ferrimagnetic minerals is the main reason for increasing magnetic susceptibility in paleosol.But the values of magnetic susceptibility in Mircea Voda section are low compared with Xifeng section in Chinese Loess Plateau.The X0 is the magnetic susceptibility when the Xfd% is zero. The X0 of Romanian loess is lower than that of Xifeng loess,so the difference of their original materials is likely to be one of the reasons why the magnetic susceptibility of Romanian loess is lower than that of Xifeng loess.Despite the effective moisture in Mircea Voda section is higher than that of Xifeng section.The pedogenesis in Romanian is weaker than that in Xifeng,different climatic condition: precipitation coupling various temperatures in China and Romania,could be another reason why the magnetic susceptibility of Mircea Voda section is lower than the Xifeng section’s.
    Original languageChinese
    Pages (from-to)738-748
    Number of pages11
    JournalDisiji Yanjiu
    Volume32
    Issue number4
    DOIs
    Publication statusPublished - 2012

    Keywords

    • Romanian loess
    • environmental magnetism
    • magnetic susceptibility
    • pedogenesis process

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