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Sanmenxia Loess and Paleoenvironmental Change
Authors:Zhao Zhizhong  Jiang Fuchu  Wu Xihao  Wang Shubing  Qiao Yansong  Liu Ke  Wang Sumin
Institution:1. Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China
2. Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China;Open Laboratory of Lake Sediment and Environment,Chinese Academy of Sciences,Nanjing 210008,China
3. Open Laboratory of Lake Sediment and Environment,Chinese Academy of Sciences,Nanjing 210008,China;State Key Laboratory of Loess and Quaternary Geology,Chinese Academy of Sciences,Xi'an 710054,China
Abstract:The Caocun (
></figure>) loess profile of Zhangbianyuan (<figure class=></figure>) is located at the southeast margin of the Loess Plateau, which is a typical representative of loess stratum in the Sanmenxia (<figure class=></figure>) area. In the 145 m thick profile, a loess-paleosol sequence occurs from L<sub>1</sub> to L<sub>33</sub>, underlain by a red clay bed. The B/M boundary was recorded at the bottom of L<sub>7</sub>, the Jaramillo event at S<sub>11</sub> to S<sub>12</sub>, the Olduval event at L<sub>23</sub> to L<sub>26</sub>, and the M/G boundary at the bottom of L<sub>33</sub> near the red clay. The magnetic susceptibility of the loess deposits, as well as the carbonate and granularity components, indicates that there have been many periodic paleoclimate changes, including a total of 13 cold events that each lasted more than 40 000 a. A high-resolution chronostratigraphic profile has been established using an age model according to grain characteristics. A clear correlation exists between records of the paleomonsoon in the Caocun loess succession and SPECMAP from 3X10<sup>5</sup> a B. P. to the present. The Caocun profile can act as a control site in the southeastern Loess Plateau. Its paleoenvironmental records relate to eastern Asian paleomonsoon theory.</td> </tr> <tr> <td align=
Keywords:Sanmenxia loess  magnetostratigraphy  paleomonsoon records  paleoenvironmental change  
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