IEECAS OpenIR  > 黄土与第四纪地质国家重点实验室(2010~)
Magneto- and cyclostratigraphy in the red clay sequence:New age model and paleoclimatic implicationfor the eastern Chinese Loess Plateau
Anwar,T(Anwar,Taslima)[1]; Kravchinsky,VA(Kravchinsky,Vadim A.)[1,2]; Zhang,R(Zhang,Rui)[2,3]
2015-09-28
Source PublicationJournal of Geophysical Research: Solid Earth
Pages6758-6770
Subtype期刊论文
Abstract

The Chinese Loess Plateau red clay sequences display a continuous alternation of sedimentary cycles that represent recurrent climatic fluctuations from 2.58 Ma to the Miocene. Deciphering such a record can provide us with vital information on global and Asian climatic variations. Lack of fossils and failure of absolute dating methods made magnetostratigraphy a leading method to build age models for the red clay sequences. Here we test the magnetostratigraphic age model against cyclostratigraphy. For this purpose we investigate the climate cyclicity recorded in magnetic susceptibility and sedimentary grain size in a red clay section previously dated 11 Myr old with magnetostratigraphy alone. Magnetostratigraphy dating based on only visual correlation could potentially lead to erroneous age model. In this study the correlation is executed through the iteration procedure until it is supported by cyclostratigraphy; i.e., Milankovitch cycles are resolved in the best possible manner. Our new age model provides an age of 5.2 Ma for the Shilou profile. Based on the new age model, wavelet analysis reveals the well-preserved 400 kyr and possible 100 kyr eccentricity cycles on the eastern Chinese Loess Plateau. Further, paleomonsoon evolution during 2.58–5.2 Ma is reconstructed and divided into three intervals (2.58–3.6 Ma, 3.6–4.5 Ma, and 4.5–5.2 Ma). The upper part, the youngest stage, is characterized by a relatively intensified summer monsoon, the middle stage reflects an intensification of the winter monsoon and aridification in Asia, and the earliest stage indicates that summer and winter monsoon cycles may have rapidly altered. The use of cyclostratigraphy along with magnetostratigraphy gives us an effective method of dating red clay sequences, and our results imply that many presently published age models for the red clay deposits should be perhaps re-evaluated.

DOI10.1002/2015JB012132
Indexed BySCI
Language英语
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/9485
Collection黄土与第四纪地质国家重点实验室(2010~)
Affiliation1.Department of Physics, University of Alberta, Edmonton, Alberta, Canada;
2.State Key Laboratory for Continental Dynamics,Department of Geology, Northwest University, Xi’an, China;
3.State Key laboratory of Loess and Quaternary Geology,Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, China
Recommended Citation
GB/T 7714
Anwar,T,Kravchinsky,VA,Zhang,R. Magneto- and cyclostratigraphy in the red clay sequence:New age model and paleoclimatic implicationfor the eastern Chinese Loess Plateau[J]. Journal of Geophysical Research: Solid Earth,2015:6758-6770.
APA Anwar,T,Kravchinsky,VA,&Zhang,R.(2015).Magneto- and cyclostratigraphy in the red clay sequence:New age model and paleoclimatic implicationfor the eastern Chinese Loess Plateau.Journal of Geophysical Research: Solid Earth,6758-6770.
MLA Anwar,T,et al."Magneto- and cyclostratigraphy in the red clay sequence:New age model and paleoclimatic implicationfor the eastern Chinese Loess Plateau".Journal of Geophysical Research: Solid Earth (2015):6758-6770.
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