Early Cretaceous Climate Changes Recorded in Magnetic Susceptibility and Color Index Variations of the Lower Liupanshan Group, Central China
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This work was co-supported by the Chinese NSFC funds (Nos. 41272127, 40972025, 40571017) and IGCP580. We are grateful to Prof. YANG Youyun, Prof. LI Rongxi for their reconstructive suggestions to the interpretation of sedimentary environments of the sampled section.


Early Cretaceous Climate Changes Recorded in Magnetic Susceptibility and Color Index Variations of the Lower Liupanshan Group, Central China
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This work was co-supported by the Chinese NSFC funds (Nos. 41272127, 40972025, 40571017) and IGCP580. We are grateful to Prof. YANG Youyun, Prof. LI Rongxi for their reconstructive suggestions to the interpretation of sedimentary environments of the sampled section.

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    摘要:

    This study carried out comprehensive analysis on sedimentology, magnetic susceptibility (χlf) and color data of the continental sediments of the Liupanshan Group in Central China so as to obtain climatic change information during the 129.14–122.98 Ma interval. Based on the results of the clf and of the redness (a*), the section can be divided into two segments: (1) 129.14–126.3 Ma, with the lowest clf values and strongly variable relatively high values of redness and (2) 126.3–122.98 Ma, with high clf values and relatively low redness. Analysis of the lithology and facies as well as the magnetic minerals and their contents points to a detrital origin of the magnetic minerals and this allow us to interpret the relationship between magnetic susceptibility variations and climate changes. Our study shows that the climate was significantly dry and hot during the whole studied interval although the interval between 126.3 Ma and 122.98 was a little bit cooler with increased humidity.

    Abstract:

    This study carried out comprehensive analysis on sedimentology, magnetic susceptibility (χlf) and color data of the continental sediments of the Liupanshan Group in Central China so as to obtain climatic change information during the 129.14–122.98 Ma interval. Based on the results of the clf and of the redness (a*), the section can be divided into two segments: (1) 129.14–126.3 Ma, with the lowest clf values and strongly variable relatively high values of redness and (2) 126.3–122.98 Ma, with high clf values and relatively low redness. Analysis of the lithology and facies as well as the magnetic minerals and their contents points to a detrital origin of the magnetic minerals and this allow us to interpret the relationship between magnetic susceptibility variations and climate changes. Our study shows that the climate was significantly dry and hot during the whole studied interval although the interval between 126.3 Ma and 122.98 was a little bit cooler with increased humidity.

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DAI Shuang, ZHU Qiang, HUANG Yongbo, DA SILVA A. Christine, ZHAO Jie, LIU Junwei, KONG Li, PENG Dongxiang, LUO Lingling, YAN Ningyun, WANG Wenjie, ZHANG Xiang.2016. Early Cretaceous Climate Changes Recorded in Magnetic Susceptibility and Color Index Variations of the Lower Liupanshan Group, Central China[J]. ACTA GEOLOGICA SINICA(English edition),90(3):1011~1023

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  • 收稿日期:2015-07-09
  • 最后修改日期:2015-11-01
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  • 在线发布日期: 2016-06-21
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