北疆黄土的磁化率各向异性揭示末次冰期以来古风向的变化

doi:10.12118/j.issn.1000-6060.2018.04.12

Abstract

Abstract: As a proxy of paleowind direction, the anisotropy of magnetic susceptibility (AMS) has been widely applied to reconstruct the paleowind history of aeolian loess deposits in Chinese Loess Plateau (CLP). However,fewer attentions have been paid to AMS in Xinjiang loess.In this study,we present AMS results from an aeolian loess section near Tacheng in North Xinjiang,China. Based on magnetic susceptibility and AMS,we discussed variations of paleowind intensity and direction. In general,SE paleowind dominatesin this area since Marine Isotope Stage (MIS)3.According to magnetic fabric characteristics,we divide the section into five stages of paleowind variations.The stage 1 (12-14 m in depth),corresponding to late MIS3c,is characterized by reworked aeolian sediment.The stage 2 (6-12 m in depth),corresponding to MIS3b,is characterized by dominate SE wind with the appearance of SW wind.During MIS3b,large-scale glaciers in Altay Mountains may cause stronger cold high pressure in the Junggar Basin.Undoubtedly,the pressure gap between Junggar Basin and Tacheng Basin will be enlarged,which will produce stronger SE wind in Tacheng Basin during MIS3b.Glacier widely developed during MIS3b in Tianshan can also push cold high pressure to expand to the north and close to Tacheng Basin,which is in favor to form stronger SW wind in Tacheng Basin.The stage 3 (4-6 m in depth),corresponding to early and middle MIS3a,is characterized by decreasing intensity of wind and disappearing SW wind.Magnetic fabric characteristics is disturbed to some extent.During this stage,temperature increased and glaciers in Tianshan retreated because of gradually increasing high-latitude (65°N) solar insolation.However,due to particular location,Altay glacier will still keep its larger scale under Mongolia and Siberian high-pressure system.Retreating glacier in Tianshan may cause gradually the disappearing of SW wind in Tacheng Basin.The stage 4 (0.5-4 m in depth),corresponding to late MIS3a and early MIS2,is characterized by completely disappeared SE wind and rapid fluctuating intensity of wind.The stage 5 (0-0.5 m in depth),corresponding to topsoil,is characterized by that the magnetic fabric characteristics is totally disturbed by pedogenesis.Systematical AMS investigation of Tacheng loess will provide a new insight in understanding dust source and mechanisms of climate changes in Tacheng Basin.

Key words: anisotropy of magnetic susceptibility, Tacheng loess, magnetic fabric characteristics, paleowinddirection

CLC Number:

P534.63

CHENG Liang-qing, SONG You-gui, SUN Huan-yu, ZONG Xiu-lan, OROZBAEV Rustam. Paleowind direction variations revealed by anisotropy of magnetic susceptibility of loess deposits in north Xinjiang since the last glacial period[J].干旱区地理, 2018, 41(4): 771-779.

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Paleowind direction variations revealed by anisotropy of magnetic susceptibility of loess deposits in north Xinjiang since the last glacial period

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