Volume 6 Issue 4
Dec.  2000
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ZHAO Zhi-zhong, WU Xi-hao, JIANG Fu-chu, et al., 2000. THE LOESS STRATIGRAPHY IN SANMENXIA AREA. Journal of Geomechanics, 6 (4): 19-26,66.
Citation: ZHAO Zhi-zhong, WU Xi-hao, JIANG Fu-chu, et al., 2000. THE LOESS STRATIGRAPHY IN SANMENXIA AREA. Journal of Geomechanics, 6 (4): 19-26,66.

THE LOESS STRATIGRAPHY IN SANMENXIA AREA

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  • Received: 2000-09-20
  • Published:
  • The Caocun loess profile in Zhangbian township located at the southeast margin of the Loess Plateau is typical of the Sanmenxia area. In the profile there occurs a loess-paleosol sequence from L1 to L33 145m thick,underlain by a red clay bed. The B/M boundary was recorded at the bottom of L7,the J magnetic event at S11 to S12,the O magnetic event at L23 to L26,and the M/G boundary at the bottom of L33 near the red clay. The magnetic susceptibility of the loess deposits,as well as the carbonates and macrograined components contained all indicate that there have been many periodic monsoon changes totalling 13 cold events,with each lasting more than 40000 years. A high-resolution chronostratigraphy of the profile has been established by an age model according to grains. There exists a clear correlation between the records of paleomonsoon in the Caocun loess succession and SPECMAP from 3×105-year BP to the present.

     

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