DOI: 10.1029/2012GL053786
论文题名: Carbonate leaching processes in the Red Clay Formation, Chinese Loess Plateau: Fingerprinting East Asian summer monsoon variability during the late Miocene and Pliocene
作者: He T. ; Chen Y. ; Balsam W. ; Qiang X. ; Liu L. ; Chen J. ; Ji J.
刊名: Geophysical Research Letters
ISSN: 0094-9393
EISSN: 1944-9124
出版年: 2013
卷: 40, 期: 1 起始页码: 194
结束页码: 198
语种: 英语
Scopus关键词: Carbonate content
; Chinese Loess Plateau
; Cooling transitions
; East Asian monsoon
; East Asian summer monsoon
; East Asian winter monsoon
; High frequency HF
; Leaching process
; Atmospheric thermodynamics
; Carbonate minerals
; Fourier transform infrared spectroscopy
; Isotopes
; Landforms
; Magnetic susceptibility
; Sediments
; Wind
; Leaching
; carbonate
; deep sea
; El Nino
; FTIR spectroscopy
; leaching
; magnetic susceptibility
; Miocene
; monsoon
; paleosol
; Pliocene
; red soil
; seasonal variation
; soil horizon
; summer
; China
; Loess Plateau
英文摘要: High-resolution variations in carbonate minerals from the Jiaxian Red Clay section, located at the northern limit of the present East Asian summer monsoon (EASM) on Chinese Loess Plateau were quantified using Fourier transform infrared spectroscopy. We analyzed a large quantity of sediments dated from the late Miocene to Pliocene (8.2-2.6 Ma). The carbonates in this interval show high-frequency variations alternating between leached and calcareous horizons. The low carbonate contents and high values of magnetic susceptibility and high Rb/Sr ratios were found in the leached zones, a pattern that is consistent with that observed in the overlying Quaternary loess-paleosol sequences. This pattern suggests that East Asian Monsoon (EAM) rainwater enhanced leaching and accumulation processes of carbonate minerals in the Red Clay Formation in a way similar to the loess-paleosol sequence. Seven alternating leached and calcareous zones are identified, suggesting oscillations of the EASM and East Asian winter monsoon intervals. The calcareous zones were also found to have high Zr/Rb ratio. These indications of shifts from a strong EASM to East Asian winter monsoon dominance correlate well with the cooling transition indicated by deep sea δ18O isotopes. This evidence suggests that the EAM was active during the late Miocene and Pliocene and was similar to the Quaternary monsoon. The presence of a strong EAM during the Pliocene Warm Period also raises questions about the hypothesis that past and future warm climate conditions could produce a permanent El Niño-like state. © 2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84874826627&doi=10.1029%2f2012GL053786&partnerID=40&md5=786011256e3360c7ec0e557dc8223520
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6657
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Key Laboratory of Surficial Geochemistry, Ministry of Education, Nanjing University, Nanjing 210093, China
Recommended Citation:
He T.,Chen Y.,Balsam W.,et al. Carbonate leaching processes in the Red Clay Formation, Chinese Loess Plateau: Fingerprinting East Asian summer monsoon variability during the late Miocene and Pliocene[J]. Geophysical Research Letters,2013-01-01,40(1).