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Zebra layers and palaeoenvironment of Late Miocene Stratum in the Linxia Basin, northwestern China

  • Xiuqing Nian
  • Xiuming LiuEmail author
  • Hui Guo
  • Zhi Liu
  • Bin Lü
  • Fengqing Han
Article
  • 64 Downloads

Abstract

Miocene strata in the Linxia Basin (Gansu, China) are usually interpreted as lacustrine sediments. However, the red–grey inter-beds known as ‘Zebra layers’ commonly tilt with respect to the terrain on the side slopes of the modern valley, which may be due to mantling palaeotopography (similar to aeolian loess). The anisotropy of magnetic susceptibility, which reflects the original arrangement of magnetic particles in sediments, was applied to investigate this phenomenon. The results showed that the tilting of the inter-beds in the side slope was due to mantle palaeotopography rather than soil creep, and that they were not deposited in a subaqueous environment. The grain sizes of sediments showed similar features as aeolian loess. We speculate that Miocene sediments were deposited by mantling the palaeotopography where aeolian materials accumulated. After deposition, flowing water submerged these strata, which caused the side slope to become gradually thinner from top to bottom and stirred the magnetic particles in these sediments. The grey colour of the Zebra layers may not be original, as it may be due to waterlogging and deoxidation after deposition; finally, when the iron oxides in these sediments were transformed or removed, their colours became grey. The formation of Zebra layers indicates that the Late Miocene palaeoenvironment of northwestern China was similar to that in which Quaternary aeolian loess was deposited.

Keywords

Late Miocene strata Zebra layers tilted side slope anisotropy of magnetic susceptibility (AMS) palaeoenvironment Linxia Basin 

Notes

Acknowledgements

This study was financially supported by the National Natural Science Foundation of China (grant nos. 41210002; U1405231).

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Copyright information

© Indian Academy of Sciences 2018

Authors and Affiliations

  • Xiuqing Nian
    • 1
    • 2
    • 3
  • Xiuming Liu
    • 4
    • 5
    • 6
    Email author
  • Hui Guo
    • 2
    • 7
  • Zhi Liu
    • 8
    • 9
  • Bin Lü
    • 4
    • 5
  • Fengqing Han
    • 1
    • 3
  1. 1.Qinghai Institute of Salt LakesChinese Academy of SciencesXiningPeople’s Republic of China
  2. 2.University of Chinese Academy of SciencesBeijingPeople’s Republic of China
  3. 3.Qinghai Provincial Key Laboratory for Geology and Environment of Salt LakeXiningPeople’s Republic of China
  4. 4.Institute of GeographyFujian Normal UniversityFujianPeople’s Republic of China
  5. 5.Key Laboratory for Subtropical Mountain Ecology, Ministry of Science and Technology and Fujian Province, College of Geographical SciencesFujian Normal UniversityFujianPeople’s Republic of China
  6. 6.Department of Environment and GeographyMacquarie UniversitySydneyAustralia
  7. 7.Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and GeophysicsChinese Academy of SciencesLanzhouPeople’s Republic of China
  8. 8.School of Human Settlements and Civil EngineeringXi’an Jiaotong UniversityXi’anPeople’s Republic of China
  9. 9.Institute of Global Environmental ChangeXi’an Jiaotong UniversityXi’anPeople’s Republic of China

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