| 哈尔滨荒山黄土的成因——粒度、地球化学、磁化率、沉积和地貌特征的整合记录 |
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| 关键词:Huangshan loess aeolian origin Huangshan Formation Harbin |
| 基金项目:国家自然科学基金项目(编号: 41871013; 41601200);哈尔滨师范大学硕士研究生学术创新项目(编号: HSDSSCX2019-06) |
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| The Genesis of Huangshan Loess in Harbin: Integrated Evidence from Grain Size, Geochemistry, Magnetization,Sedimentation and Landform |
| Huangshan loess in Harbin is located at the eastern end of the Eurasian loess belt and adjacent to the eastern edge of the arid belt of the Asian continent. However, the genesis of loess remains controversial. Through field observation and analysis of grain size, geochemical composition of elements and magnetization of drilling cores in Huangshan of Harbin, the authors investigated the genetic mechanism of Huangshan loess. The results show that the grain size composition of loess is mainly coarse silty (16 ~ 63 microns), and the grain size parameters (mean particle size, median particle size, standard deviation, deviation and peak state), grain size image characteristics (C-M, A-M and L-M), discriminant function and Kd value have no obvious indication to aeolian origin of loess. The major and trace element geochemical compositions of L1-L5 loess are not differentiated from the L5 secondary loess and the underlying fluvial and lacustrine sediments (Huangshan Formation) under the loess-paleosols sequence. The magnetization of loess - paleosoil sequence in Huangshan shows the characteristics of periodic high and low variation, which is in good agreement with the typical aeolian loess section on the Loess Plateau. Combined with field observation, the authors hold that the loess of Huangshan has typical characteristics of eolian loess, such as uniform deposition and vertical joint development. In this paper, the aeolian origin of Huangshan loess in Harbin was determined by the method of integration. The grain size and geochemical indexes of loess as alternative indexes of loess genesis mechanism have some limitations. In practical application, they should be combined with field observation, magnetization and other alternative indexes to extract correct genesis mechanism information. |
| WU Peng,XIE Yuan-yun,KANG Chun-guo,CHI Yun-ping,WEI Zhen-yu,SUN Lei,WANG Jia-xin.2020.The Genesis of Huangshan Loess in Harbin: Integrated Evidence from Grain Size, Geochemistry, Magnetization,Sedimentation and Landform[J].Acta Geoscientica Sinica,41(3):420-430. |
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