Magnetic fabric of early Quaternary loess-paleosols of Longdan Profile in Gansu Province and the reconstruction of the paleowind directions

作     者：LIU Ping JIN ChunSheng ZHANG Song HAN JiaMao LIU TungSheng 

作者机构：Institute of Geology and Geophysics Chinese Academy of Science Beijing 100029 China 

出 版 物：《Chinese Science Bulletin》 (CHINESE SCIENCE BULLETIN)

年 卷 期：2008年第53卷第9期

页      面：1450-1452页

核心收录：

学科分类：070902[理学-地球化学] 0709[理学-地质学] 07[理学] 

基　　金：Supported by 2003 Liu Tungsheng National Top Science and Technology Awards 

主　　题：磁组构 青藏高原 风向 古土壤 

摘      要：The anisotropy of magnetic susceptibility (AMS) is a rapid and precise tool for determining paleowind directions. During the past several decades, AMS has been used for determining paleowind directions of Chinese loess. The AMS for a loess-paleosol profile in early Quaternary at Longdan in the Linxia Basin, Gansu Province, northeastern fringe of Qinghai-Xizang (Tibetan) Plateau has been obtained. The primary results show that the AMS of the Longdan profile has its typical normal eolian dust deposit. The AMS is mainly controlled by magnetic foliation (F) and the shape parameter of the AMS ellipsoid is oblate. The declination of maximum susceptibility (K1) was used to determine the paleowind direction of that area in early Quaternary and it was found that the paleowind direction is biased towards NW-SE.