Iron oxide characteristics of mid-Miocene Red Clay deposits on the western Chinese Loess Plateau and their paleoclimatic implications

The middle Miocene climate optimum (MMCO, 14.3-163 Ma) was a warm climatic interval that may provide an analog for future climates in the context of ongoing global warming. In continental regions, however, reconstruction of the MMCO remains controversial due to the lack of robust proxies from contin...

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Bibliographic Details
Published in:Palaeogeography, Palaeoclimatology, Palaeoecology
Main Authors: Zhao, Hui, Sun, Youbin, Qiang, Xiaoke
Format: Article in Journal/Newspaper
Language:English
Published: 2017
Subjects:
Middle Miocene Climate Optimum
Red Clay
Iron Oxides
Paleoclimate
Science & Technology
Physical Sciences
Life Sciences & Biomedicine
TEMPERATURE-DEPENDENT SUSCEPTIBILITY
MAGNETIC-SUSCEPTIBILITY
TIBETAN PLATEAU
ENVIRONMENTAL MAGNETISM
CLIMATIC OPTIMUM
HOLOCENE LOESS
CENTRAL-EUROPE
ASIAN MONSOON
ICE-SHEET
RECORD
Physical Geography
Geology
Paleontology
Geography
Physical
Geosciences
Multidisciplinary
Ice Sheet
Online Access:http://ir.ieecas.cn/handle/361006/5512
https://doi.org/10.1016/j.palaeo.2016.12.008
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Summary:The middle Miocene climate optimum (MMCO, 14.3-163 Ma) was a warm climatic interval that may provide an analog for future climates in the context of ongoing global warming. In continental regions, however, reconstruction of the MMCO remains controversial due to the lack of robust proxies from continuous sedimentary sequences. In this study, we investigated the composition and relative abundance of pedogenic iron oxides in the Zhuanglang Red Clay deposits from the western Chinese Loess Plateau, using rock magnetic, color reflectance, and geochemical analyses. Our aim was to assess the climatic sensitivity of iron oxides in order to produce robust proxies for reconstructing regional temperature and moisture relationships during the MMCO. Our results indicate that the MMCO in the study region was characterized by high effective precipitation, relatively high temperature and strong pedogenesis, suggesting a strong East Asian summer monsoon (EASM). The strengthening of the EASM intensity during the MMCO is consistent with records of enhanced terrigenous chemical weathering in the South China Sea, and the occurrence of a relatively warm and humid climate on a global scale, implying the strong coupling between Asian monsoon evolution and global climate change during the middle Miocene. In addition, the magnetic susceptibility record of the Zhuanglang Red Clay demonstrates that eccentricity played the dominant role in controlling the EASM during the MMCO. (C) 2016 Elsevier B.V. All rights reserved.

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