Mechanism of palygorskite formation in the Red Clay Formation on the Chinese Loess Plateau, northwest China

Geoderma ◽  
2013 ◽  
Vol 192 ◽  
pp. 39-49 ◽  
Author(s):  
Qiaoqin Xie ◽  
Tianhu Chen ◽  
Hui Zhou ◽  
Xiaochun Xu ◽  
Huifang Xu ◽  
...  
Keyword(s):  
Loess Plateau ◽  
Northwest China ◽  
Chinese Loess Plateau ◽  
Red Clay ◽  
Chinese Loess ◽  
Clay Formation ◽  
The Chinese Loess Plateau

Mineral magnetic record of the Miocene-Pliocene climate transition on the Chinese Loess Plateau, North China

2017 ◽  
Vol 89 (3) ◽  
pp. 619-628 ◽  
Author(s):  
Hong Ao ◽  
Mark J. Dekkers ◽  
Andrew P. Roberts ◽  
Eelco J. Rohling ◽  
Zhisheng An ◽  
...  
Keyword(s):  
Climate Variability ◽  
East Asia ◽  
Loess Plateau ◽  
Single Domain ◽  
Chinese Loess Plateau ◽  
Red Clay ◽  
Chinese Loess ◽  
Mineral Magnetic ◽  
Climate Transition ◽  
The Chinese Loess Plateau

AbstractPre-Quaternary terrestrial climate variability is less well understood than that during the Quaternary. The continuous eolian Red Clay sequence underlying the well-known Quaternary loess-paleosol sequence on the Chinese Loess Plateau (CLP) provides an opportunity to study pre-Quaternary terrestrial climate variability in East Asia. Here, we present new mineral magnetic records for a recently found Red Clay succession from Shilou area on the eastern CLP, and demonstrate a marked East Asian climate shift across the Miocene-Pliocene boundary (MPB). Pedogenic fine-grained magnetite populations, ranging from superparamagnetic (SP)/single domain (SD) up to small pseudo-single domain (PSD) sizes (i.e., from <30 nm up to ~1000 nm), dominate the magnetic properties. Importantly, our mineral magnetic results indicate that both pedogenic formation of SP grains and transformation of SP grains to SD and small PSD grains accelerated across the MPB in the Shilou Red Clay, which are indicative of enhanced pedogenesis. We relate this enhanced pedogenesis to increased soil moisture availability on the CLP, associated with stronger Asian Summer Monsoon precipitation during an overall period of global cooling. Our study thus provides new insights into the Miocene-Pliocene climate transition in East Asia.

Chlorite weathering linked to magnetic enhancement in Red Clay on the Chinese Loess Plateau

2020 ◽  
Vol 538 ◽  
pp. 109446 ◽  
Author(s):  
Chengcheng Ye ◽  
Yibo Yang ◽  
Xiaomin Fang ◽  
Jinbo Zan ◽  
Mengqi Tan ◽  
...  
Keyword(s):  
Loess Plateau ◽  
Chinese Loess Plateau ◽  
Red Clay ◽  
Chinese Loess ◽  
Magnetic Enhancement ◽  
The Chinese Loess Plateau

Six million years of magnetic grain-size records reveal that temperature and precipitation were decoupled on the Chinese Loess Plateau during ~ 4.5–2.6 Ma

2013 ◽  
Vol 79 (3) ◽  
pp. 465-470 ◽  
Author(s):  
Junsheng Nie ◽  
Yougui Song ◽  
John W. King ◽  
Rui Zhang ◽  
Xiaomin Fang
Keyword(s):  
Grain Size ◽  
Loess Plateau ◽  
Remanent Magnetization ◽  
Chinese Loess Plateau ◽  
Joint Analysis ◽  
Red Clay ◽  
Chinese Loess ◽  
Proxy Records ◽  
Temperature And Precipitation ◽  
The Chinese Loess Plateau

AbstractMagnetic grain-size variations have been used as sensitive paleoclimate proxies to investigate the evolution of the East Asian summer monsoon, but their relationship with temperature and precipitation is not entirely clear. Here we find that two magnetic grain-size proxy records (χARM/χLF and χARM/SIRM, where χARM, χLF and SIRM are anhysteretic remanent magnetization susceptibility, magnetic susceptibility measured at 470 Hz and saturation isothermal remanent magnetization, respectively) of Chinese loess and red-clay sediments co-vary during the last 6 Ma, except between ~ 4.5 and 2.6 Ma, when these two records had opposite trends. We attribute this disparate behavior to the different responses of χARM/χLF and χARM/SIRM to temperature and precipitation during ~ 4.5–2.6 Ma, when temperature and precipitation on the Chinese Loess Plateau were decoupled. A comparison of the loess and red-clay χARM/χLF and χARM/SIRM records with the global ice-volume proxy records reveals that χARM/χLF is more sensitive to temperature variations than χARM/SIRM. The results suggest that temperature on the Chinese Loess Plateau had a cooling trend from ~ 4.5 to ~ 2.6 Ma, whereas rainfall tended to increase. Our studies demonstrate that joint analysis of loess χARM/χLF and χARM/SIRM records can reveal paleoclimatic information that cannot be revealed by a single parameter.

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