STUDY ON THE DIVISION AND CORRELATION OF QUATERNARY STRATAIN IN LAOHUSHAN ACTIVE FAULT AREA,JINGTAI COUNTY,GANSU
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    Abstract:

    The Quaternary strata in Laohushan area are mainly the torrenthial diluvium and river ter-race deposits,the ages of nearly 40 samples determined by14C,TL and diffusion equation meth-ods indicate that:the first terrace formed in Holocene, its age is about 4086±100a-4578±60a;the second terrace formed in late period of Late-Pleistocene,its age is about 23ka;the third terrace formed in early period of Late-Pleistocene,its age is about 72ka;the forth and fifth terraces formed in Middle-Pleistocene,their ages are about 217±35ka and 378±60ka,re-spectively. The deposits of Early-Pleistocene distribute only in some areas.perhaps formed in the early period of Early-Pleistocene.
    By comparison with the loess profile at Jiuzhoutai of Lanzhou, the ages of I-V terraces are compatible with the ages of So,Sma,Smc,S2,S4 paleosoils in the standard profiles. The re-search results indicate that the formation of stratified landforms of rivers is associated with the tectonic movement,meanwhile,has a very closely inner relation to the global cold-warm alter-nation climate environment.

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History
  • Received:September 15,1993
  • Revised:
  • Adopted:
  • Online: June 24,2017
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