Magnetic fabric-based reconstruction of the paleowind direction from a loess sequence in the northeastern flank of the Qilian Mountains

作者：Wang Yong^*; Pan Bao Tian; Gao Hong Shan; Guan Qing Yu; Chen Ying Ying; Wang Jun Ping

来源：Acta Geophysica Sinica, 2007, 50(4): 1161-1166.

DOI：10.1002/cjg2.1117

• paleowind direction
• Qilian Mountains
• magnetic fabric

To reconstruct a continuous record of paleowind patterns from eolian sequences, low field anisotropy of magnetic susceptibility (AMS) is considered to be a useful paleowind- retrieving proxy. This paper reports the AMS-based reconstruction of the paleowind direction variations spanning the past 1.4 Ma (million years) in the northeastern flank of the Qilian Mountains. Our results suggest that a NW-SE paleowind regime prevailed between 1.4 Ma and 0.78 Ma and a stable prevailing paleowind of NE-SW direction was established around 0.5 Ma after a period of transition (0.78 similar to 0.5 Ma). The ending time of the earlier paleowind pattern (0.78 Ma) seems to be approximately coincident with the reported ending time of the reconstructed major tectonic uplift event occurred in 1.2 similar to 0.8 Ma. This coincidence may imply that the near surface atmospheric circulation Pattern might have causally related with the Tibetan Plateau tectonic uplift.

• 出版日期2007-7
• 单位兰州大学