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Age and origin of accreted ocean plate stratigraphy in the North Qilian belt, NE Tibet Plateau: evidence from microfossils and geochemistry of cherts and siltstones

View ORCID ProfileZhen Yan, Wenjiao Xiao, View ORCID ProfileJonathan C. Aitchison, Chao Yuan, Chuanzhou Liu and Changlei Fu
Journal of the Geological Society, 178, jgs2020-231, 8 June 2021, https://doi.org/10.1144/jgs2020-231
Zhen Yan
1Chinese Academy of Geological Sciences, Institute of Geology, Beijing 100037, China
Roles: [Conceptualization (Lead)], [Data curation (Lead)], [Investigation (Lead)], [Methodology (Lead)], [Writing – original draft (Lead)], [Writing – review & editing (Equal)]
  • Find this author on Google Scholar
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  • ORCID record for Zhen Yan
  • For correspondence: [email protected] [email protected]
Wenjiao Xiao
2Chinese Academy of Sciences, Xinjiang Institute of Ecology and Geography, Urumqi 830011, China
3Chinese Academy of Sciences, Institute of Geology and Geophysics, Beijing 100029, China
Roles: [Funding acquisition (Supporting)], [Investigation (Equal)], [Supervision (Equal)]
  • Find this author on Google Scholar
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Jonathan C. Aitchison
4School of Earth and Environmental Sciences, University of Queensland, Brisbane, Queensland 4072, Australia
Roles: [Investigation (Equal)], [Methodology (Equal)], [Supervision (Equal)], [Writing – review & editing (Equal)]
  • Find this author on Google Scholar
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  • ORCID record for Jonathan C. Aitchison
Chao Yuan
5Chinese Academy of Sciences, Guangzhou Institute of Geochemistry, Guangzhou 410640, China
Roles: [Conceptualization (Equal)], [Investigation (Supporting)]
  • Find this author on Google Scholar
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Chuanzhou Liu
3Chinese Academy of Sciences, Institute of Geology and Geophysics, Beijing 100029, China
Roles: [Investigation (Supporting)], [Methodology (Supporting)]
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Changlei Fu
1Chinese Academy of Geological Sciences, Institute of Geology, Beijing 100037, China
Roles: [Data curation (Supporting)], [Investigation (Supporting)]
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Abstract

The accretionary complex (AC) in the North Qilian belt comprises coherent and chaotic units consisting of bedded cherts, pelagic mudstone, shale, turbidites, basalt, limestone, blueschist, eclogite lenses and ophiolitic mélange. Cherts from the Donggoukou and Biandukou outcrops in the north of the blueschist belt contain abundant Middle Ordovician radiolarians together with rare conodonts. Well-preserved radiolarians also occur in cherts associated with high-pressure/low-temperature rocks in the Baijingsi AC outcrop. Conodonts of Floian–Dapingian age and Middle Ordovician radiolarians also occur in the Shihuigou AC. Geochemical analysis of 23 cherts reveals variable SiO2 contents (74.56–97.16 wt%) and high mean Al/(Al  +  Fe  +  Mn) ratios ranging from 0.35 to 0.85, indicating a non-hydrothermal origin. Ce/Ce* and LaN/YbN ratios of 0.70–1.22 and 0.67–1.59 respectively are high and variable, similar to those of associated muddy siltstone (0.59–0.96 and 1.14–1.55, respectively), suggesting near-trench deposition with associated terrigenous input. Together with the metamorphic ages of blueschists and eclogites, the North Qilian belt AC formed by accretion of ocean plate stratigraphic successions in response to subduction of the Proto-Tethyan Ocean prior to 450 Ma.

Supplementary material: Appendices 1-6 are available at: https://doi.org/10.6084/m9.figshare.c.5418275

Thematic collection: This article is part of the Fold-and-thrust belts collection available at: https://www.lyellcollection.org/cc/fold-and-thrust-belts

  • © 2021 The Author(s). Published by The Geological Society of London. All rights reserved
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Journal of the Geological Society: 178 (6)
Journal of the Geological Society
Volume 178, Issue 6
November 2021
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Age and origin of accreted ocean plate stratigraphy in the North Qilian belt, NE Tibet Plateau: evidence from microfossils and geochemistry of cherts and siltstones

Zhen Yan, Wenjiao Xiao, Jonathan C. Aitchison, Chao Yuan, Chuanzhou Liu and Changlei Fu
Journal of the Geological Society, 178, jgs2020-231, 8 June 2021, https://doi.org/10.1144/jgs2020-231
Zhen Yan
1Chinese Academy of Geological Sciences, Institute of Geology, Beijing 100037, China
Roles: [Conceptualization (Lead)], [Data curation (Lead)], [Investigation (Lead)], [Methodology (Lead)], [Writing – original draft (Lead)], [Writing – review & editing (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Zhen Yan
  • For correspondence: [email protected] [email protected]
Wenjiao Xiao
2Chinese Academy of Sciences, Xinjiang Institute of Ecology and Geography, Urumqi 830011, China
3Chinese Academy of Sciences, Institute of Geology and Geophysics, Beijing 100029, China
Roles: [Funding acquisition (Supporting)], [Investigation (Equal)], [Supervision (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Jonathan C. Aitchison
4School of Earth and Environmental Sciences, University of Queensland, Brisbane, Queensland 4072, Australia
Roles: [Investigation (Equal)], [Methodology (Equal)], [Supervision (Equal)], [Writing – review & editing (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Jonathan C. Aitchison
Chao Yuan
5Chinese Academy of Sciences, Guangzhou Institute of Geochemistry, Guangzhou 410640, China
Roles: [Conceptualization (Equal)], [Investigation (Supporting)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Chuanzhou Liu
3Chinese Academy of Sciences, Institute of Geology and Geophysics, Beijing 100029, China
Roles: [Investigation (Supporting)], [Methodology (Supporting)]
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  • Find this author on PubMed
  • Search for this author on this site
Changlei Fu
1Chinese Academy of Geological Sciences, Institute of Geology, Beijing 100037, China
Roles: [Data curation (Supporting)], [Investigation (Supporting)]
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  • Find this author on PubMed
  • Search for this author on this site

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Age and origin of accreted ocean plate stratigraphy in the North Qilian belt, NE Tibet Plateau: evidence from microfossils and geochemistry of cherts and siltstones

Zhen Yan, Wenjiao Xiao, Jonathan C. Aitchison, Chao Yuan, Chuanzhou Liu and Changlei Fu
Journal of the Geological Society, 178, jgs2020-231, 8 June 2021, https://doi.org/10.1144/jgs2020-231
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