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Spatial and temporal influence of Pacific subduction on South China: geochemical migration of Cretaceous mafic–intermediate rocks

Chengshi Gan, Yuejun Wang, View ORCID ProfileTiffany L. Barry, Yuzhi Zhang and Xin Qian
Journal of the Geological Society, 177, 1013-1024, 22 May 2020, https://doi.org/10.1144/jgs2019-208
Chengshi Gan
1Guangdong Provincial Key Lab of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-sen University, , China
2Southern Laboratory of Ocean Science and Engineering, , China
Roles: [Data curation (Lead)], [Writing - Original Draft (Lead)], [Writing - Review & Editing (Lead)]
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Yuejun Wang
1Guangdong Provincial Key Lab of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-sen University, , China
2Southern Laboratory of Ocean Science and Engineering, , China
Roles: [Data curation (Equal)], [Funding acquisition (Lead)], [Writing - Review & Editing (Equal)]
  • Find this author on Google Scholar
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  • For correspondence: wangyuejun@mail.sysu.edu.cn
Tiffany L. Barry
3School of Geography, Geology and the Environment, University of Leicester, University Road, , UK
Roles: [Data curation (Equal)], [Writing - Review & Editing (Equal)]
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  • ORCID record for Tiffany L. Barry
Yuzhi Zhang
1Guangdong Provincial Key Lab of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-sen University, , China
2Southern Laboratory of Ocean Science and Engineering, , China
Roles: [Data curation (Equal)], [Writing - Review & Editing (Supporting)]
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Xin Qian
1Guangdong Provincial Key Lab of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-sen University, , China
2Southern Laboratory of Ocean Science and Engineering, , China
Roles: [Data curation (Supporting)], [Writing - Review & Editing (Supporting)]
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Abstract

The Cretaceous igneous rocks in the South China Block (SCB) were associated with the slab subduction and roll-back of the Pacific Plate. Thus, they provide excellent opportunities to examine the spatial–temporal geochemical migration of magmatism in the retreating subduction margins. The Cretaceous mafic–intermediate igneous rocks from the southeastern SCB were aged between 142 and 71 Ma, and can geochemically be subdivided into three groups: Group A (126–129 Ma and 83–93 Ma), Group B (126–142 Ma and 71–108 Ma) and Group C (116–142 Ma and 70–110 Ma). Group A and B were mainly distributed in the SCB interior and derived from asthenosphere and asthenosphere–lithosphere interaction sources, respectively. Group C occurred to the east of the Ganjiang Fault and originated from slab–lithosphere interaction. From the coastal provinces to the interior, these mafic–intermediate igneous rocks show increasing incompatible element ratios and Nd isotopic compositions, reflective of a westerly decreasing involvement of slab-derived components. They show two similar age-pulses at c. 125 Ma and c. 90 Ma as well as the Cretaceous A-type granites, indicating two episodes of subduction retreat of the Pacific slab during the Cretaceous. This spatial–temporal pattern of the Cretaceous mafic–intermediate igneous rocks suggests that the Cretaceous slab metasomatism of Pacific subduction retreat was limited to the east of the Ganjiang Fault.

Supplementary material: Tables of geochemical data and additional figures are available at https://doi.org/10.6084/m9.figshare.c.4938576

  • © 2020 The Author(s). Published by The Geological Society of London. All rights reserved
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Journal of the Geological Society: 177 (5)
Journal of the Geological Society
Volume 177, Issue 5
September 2020
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Spatial and temporal influence of Pacific subduction on South China: geochemical migration of Cretaceous mafic–intermediate rocks

Chengshi Gan, Yuejun Wang, Tiffany L. Barry, Yuzhi Zhang and Xin Qian
Journal of the Geological Society, 177, 1013-1024, 22 May 2020, https://doi.org/10.1144/jgs2019-208
Chengshi Gan
1Guangdong Provincial Key Lab of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-sen University, , China
2Southern Laboratory of Ocean Science and Engineering, , China
Roles: [Data curation (Lead)], [Writing - Original Draft (Lead)], [Writing - Review & Editing (Lead)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Yuejun Wang
1Guangdong Provincial Key Lab of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-sen University, , China
2Southern Laboratory of Ocean Science and Engineering, , China
Roles: [Data curation (Equal)], [Funding acquisition (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: wangyuejun@mail.sysu.edu.cn
Tiffany L. Barry
3School of Geography, Geology and the Environment, University of Leicester, University Road, , UK
Roles: [Data curation (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 Tiffany L. Barry
Yuzhi Zhang
1Guangdong Provincial Key Lab of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-sen University, , China
2Southern Laboratory of Ocean Science and Engineering, , China
Roles: [Data curation (Equal)], [Writing - Review & Editing (Supporting)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Xin Qian
1Guangdong Provincial Key Lab of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-sen University, , China
2Southern Laboratory of Ocean Science and Engineering, , China
Roles: [Data curation (Supporting)], [Writing - Review & Editing (Supporting)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site

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Spatial and temporal influence of Pacific subduction on South China: geochemical migration of Cretaceous mafic–intermediate rocks

Chengshi Gan, Yuejun Wang, Tiffany L. Barry, Yuzhi Zhang and Xin Qian
Journal of the Geological Society, 177, 1013-1024, 22 May 2020, https://doi.org/10.1144/jgs2019-208
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