scholarly journals Quantification of the contribution of pedogenic magnetic minerals to magnetic susceptibility of loess and paleosols on Chinese Loess Plateau: Paleoclimatic implications

2009 ◽  
Vol 114 (B9) ◽  
Author(s):  
Qiaoqin Xie ◽  
Tianhu Chen ◽  
Huifang Xu ◽  
Jun Chen ◽  
Junfeng Ji ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Loess Plateau ◽  
Chinese Loess Plateau ◽  
Magnetic Minerals ◽  
Chinese Loess

Out-of-phase evolution between summer and winter East Asian monsoons during the Holocene as recorded by Chinese loess deposits

2014 ◽  
Vol 81 (3) ◽  
pp. 500-507 ◽  
Author(s):  
Dunsheng Xia ◽  
Jia Jia ◽  
Guanhua Li ◽  
Shuang Zhao ◽  
Haitao Wei ◽  
...  
Keyword(s):  
Loess Plateau ◽  
East Asian Monsoon ◽  
East Asian ◽  
Winter Monsoon ◽  
Chinese Loess Plateau ◽  
Magnetic Minerals ◽  
The Holocene ◽  
Chinese Loess ◽  
Southern Chinese ◽  
Monsoon Strength

AbstractWe analyzed climate proxies from loessic-soil sections of the southern Chinese Loess Plateau. The early Holocene paleosol, S0, is 3.2 m thick and contains six sub-soil units. Co-eval soils from the central Loess Plateau are thinner (~ 1 m). Consequently higher-resolution stratigraphic analyses can be made on our new sections and provide more insight into Holocene temporal variation of the East Asian monsoon. Both summer and winter monsoon evolution signals are recorded in the same sections, enabling the study of phase relationships between the signals. Our analyses consist of (i) measurements of magnetic properties sensitive to the production of fine-grained magnetic minerals which reflect precipitation intensity and summer monsoon strength; and (ii) grain-size analyses which reflect winter monsoon strength. Our results indicate that the Holocene precipitation maximum occurred in the mid-Holocene, ~ 7.8–3.5 cal ka BP, with an arid interval at 6.3–5.3 cal ka BP. The winter monsoon intensity declined to a minimum during 5.0–3.4 cal ka BP. These results suggest that the East Asian summer and winter monsoons were out of phase during the Holocene, possibly due to their different sensitivities to ice and snow coverage at high latitudes and to sea-surface temperature at low latitudes.

scholarly journals Northwestward decline of magnetic susceptibility for the red clay deposit in the Chinese Loess Plateau

2002 ◽  
Vol 29 (24) ◽  
pp. 15-1-15-4 ◽  
Author(s):  
S. F. Xiong ◽  
W. Y. Jiang ◽  
S. L. Yang ◽  
Z. L. Ding ◽  
T. S. Liu
Keyword(s):  
Magnetic Susceptibility ◽  
Loess Plateau ◽  
Chinese Loess Plateau ◽  
Red Clay ◽  
Chinese Loess ◽  
Clay Deposit ◽  
The Chinese Loess Plateau

Remanence Characteristics of Different Magnetic Grain Size Categories at Xifeng, Central Chinese Loess Plateau

1994 ◽  
Vol 42 (2) ◽  
pp. 162-165 ◽  
Author(s):  
Xiuming Liu ◽  
Tim Rolph ◽  
Jan Bloemendal ◽  
John Shaw ◽  
Tungsheng Liu
Keyword(s):  
Grain Size ◽  
Magnetic Susceptibility ◽  
Low Temperature ◽  
Loess Plateau ◽  
Remanent Magnetization ◽  
Chinese Loess Plateau ◽  
Chinese Loess ◽  
The Past ◽  
Low Field ◽  
Grain Size Fractions

AbstractUtilizing the thermal unblocking of low-temperature remanent magnetization in superparamagnetic (SP) ferrimagnets and the low-temperature demagnetization of multidomain (MD) magnetite remanences, the relative proportions of SP, MD, and singledomain (SD and SD-like) ferrimagnets are estimated in the topmost part of a loess section at Xifeng, China, which covers about the past 130,000 yr. SP ferrimagnets are commonly regarded as pedogenic (authigenic) products while the MD component is believed to have a detrital origin. These measurements, therefore, provide new data which improve our understanding of the characteristics and distribution of the different magnetic grain-size fractions present in loess and soils. In particular, our measurements indicate a larger MD fraction in soil than in loess, a result which indicates that although enhancement of the SP ferrimagnet fraction dominates the increased low-field magnetic susceptibility of paleosols, an enhancement of the MD fraction, probably through leaching, also plays an important role during pedogenesis.

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