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Mafic rocks from the southern Alxa block of Northwest China and its geodynamic evolution in the Paleozoic

Liqi Zhang, Hongfei Zhang, Chris Hawkesworth, Biji Luo and View ORCID ProfileHe Yang
Journal of the Geological Society, 4 March 2021, https://doi.org/10.1144/jgs2020-038
Liqi Zhang
1State Key Laboratory of Geological Processes and Mineral Resources and School of Earth Science, China University of Geosciences, Wuhan 430074, P.R. China
2School of Earth Resource, Collaborative Innovation Centre for Exploration of Strategic Mineral Resources, China University of Geosciences, Wuhan 430074, China
Roles: [Funding acquisition (Lead)], [Investigation (Equal)], [Project administration (Equal)], [Resources (Equal)], [Supervision (Lead)], [Writing – review & editing (Equal)]
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Hongfei Zhang
1State Key Laboratory of Geological Processes and Mineral Resources and School of Earth Science, China University of Geosciences, Wuhan 430074, P.R. China
Roles: [Funding acquisition (Lead)], [Investigation (Equal)], [Project administration (Equal)], [Resources (Equal)], [Supervision (Lead)], [Writing – review & editing (Equal)]
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  • For correspondence: hfzhang@cug.edu.cn
Chris Hawkesworth
3School of Earth Sciences, University of Bristol, Bristol BS81RJ, UK
Roles: [Conceptualization (Equal)], [Formal analysis (Equal)], [Supervision (Lead)], [Writing – review & editing (Lead)]
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Biji Luo
1State Key Laboratory of Geological Processes and Mineral Resources and School of Earth Science, China University of Geosciences, Wuhan 430074, P.R. China
Roles: [Funding acquisition (Equal)], [Resources (Equal)], [Supervision (Equal)], [Writing – review & editing (Equal)]
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He Yang
4Xinjiang Research Centre for Mineral Resources, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
Roles: [Investigation (Equal)], [Resources (Supporting)], [Writing – review & editing (Supporting)]
  • Find this author on Google Scholar
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Abstract

The southern margin of the Alxa Terrane is located between the North Qilian Orogenic Belt and the inner Alxa block, and Paleozoic mafic magmatism records the geodynamic evolution at different stages in the orogenic cycle. New zircon U−Pb ages and whole-rock geochemistry reveal three groups of mafic rocks in the southern margin of the Alxa block: (i) c. 480 Ma Xijing gabbros, characterized by high Ba/Th and low Th/La ratios with low εNd(t) (−5.7 to −4.9) values, implying their derivation from enriched mantle metasomatized by slab-derived fluids; (ii) c. 440 Ma Xijing and Jiling hornblende gabbros which have high Th/La and low Ba/Th ratios, suggesting that they were produced by partial melting of mantle modified by previously subducted sediments; (iii) c. 250 Ma Xijing pyroxenites, which are cumulates with relatively high εNd(t) (+5.2 to  +  5.9), indicating that their host magmas were derived from relatively depleted mantle. Together with published results, these new data highlight that the c. 480 and c. 440 Ma mafic magmas were related to the northward subduction of the North Qilian oceanic slab and later post-collisional lithospheric delamination, respectively. The c. 250 Ma Xijing pyroxenites were related to younger lithospheric extension in the development of the Central Asian Orogenic Belt in the Alxa block.

Supplementary material: Supplementary tables A1–A7 are available at https://doi.org/10.6084/m9.figshare.c.5287657

  • © 2021 The Author(s). Published by The Geological Society of London. All rights reserved
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Mafic rocks from the southern Alxa block of Northwest China and its geodynamic evolution in the Paleozoic

Liqi Zhang, Hongfei Zhang, Chris Hawkesworth, Biji Luo and He Yang
Journal of the Geological Society, 4 March 2021, https://doi.org/10.1144/jgs2020-038
Liqi Zhang
1State Key Laboratory of Geological Processes and Mineral Resources and School of Earth Science, China University of Geosciences, Wuhan 430074, P.R. China
2School of Earth Resource, Collaborative Innovation Centre for Exploration of Strategic Mineral Resources, China University of Geosciences, Wuhan 430074, China
Roles: [Funding acquisition (Lead)], [Investigation (Equal)], [Project administration (Equal)], [Resources (Equal)], [Supervision (Lead)], [Writing – review & editing (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Hongfei Zhang
1State Key Laboratory of Geological Processes and Mineral Resources and School of Earth Science, China University of Geosciences, Wuhan 430074, P.R. China
Roles: [Funding acquisition (Lead)], [Investigation (Equal)], [Project administration (Equal)], [Resources (Equal)], [Supervision (Lead)], [Writing – review & editing (Equal)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: hfzhang@cug.edu.cn
Chris Hawkesworth
3School of Earth Sciences, University of Bristol, Bristol BS81RJ, UK
Roles: [Conceptualization (Equal)], [Formal analysis (Equal)], [Supervision (Lead)], [Writing – review & editing (Lead)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Biji Luo
1State Key Laboratory of Geological Processes and Mineral Resources and School of Earth Science, China University of Geosciences, Wuhan 430074, P.R. China
Roles: [Funding acquisition (Equal)], [Resources (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
He Yang
4Xinjiang Research Centre for Mineral Resources, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
Roles: [Investigation (Equal)], [Resources (Supporting)], [Writing – review & editing (Supporting)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for He Yang

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Mafic rocks from the southern Alxa block of Northwest China and its geodynamic evolution in the Paleozoic

Liqi Zhang, Hongfei Zhang, Chris Hawkesworth, Biji Luo and He Yang
Journal of the Geological Society, 4 March 2021, https://doi.org/10.1144/jgs2020-038
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